Ladha, J. K. Person

selected publications

• article

  • Conservation agriculture for sustainable intensification in South Asia.  NATURE SUSTAINABILITY.  3:336-343. 2020
  • Changes in soil biology under conservation agriculture based sustainable intensification of cereal systems in Indo-Gangetic Plains.  Geoderma.  313:193-204. 2018
  • Can productivity and profitability be enhanced in intensively managed cereal systems while reducing the environmental footprint of production? Assessing sustainable intensification options in the breadbasket of India..  AGRICULTURE ECOSYSTEMS & ENVIRONMENT.  252:132-147. 2018
  • A global analysis of alternative tillage and crop establishment practices for economically and environmentally efficient rice production.  Scientific Reports.  7:9342-9342. 2017
  • Rice Production Systems 2017
  • Growing Rice in Eastern India: New Paradigms of Risk Reduction and Improving Productivity 2017
  • Increasing input resources use efficiency through appropriate weed management in Indian agriculture 2017
  • Agronomic improvements can make future cereal systems in South Asia far more productive and result in a lower environmental footprint.  Global Change Biology.  22:1054-1074. 2016
  • Quantifying changes to the global warming potential of rice wheat systems with the adoption of conservation agriculture in northwestern India.  AGRICULTURE ECOSYSTEMS & ENVIRONMENT.  219:125-137. 2016
  • Global nitrogen budgets in cereals: A 50-year assessment for maize, rice, and wheat production systems..  Scientific Reports.  6:19355-19355. 2016
  • Productivity Trends in Intensive Rice–Wheat Cropping Systems in Asia 2015
  • Soil Physical Effects of Puddling in Rice–Wheat Cropping Systems 2015
  • Corrigendum to “Improvement of cereal-based cropping systems following the principles of conservation agriculture under changing agricultural scenarios in Bangladesh” [Field Crops Res. 175 (April) (2015) 1–15].  Field Crops Research.  179:173-173. 2015
  • IRRI-India Partnership: Workplan and Strategy 2015
  • Integration of conservation agriculture with best management practices for improving system performance of the rice–wheat rotation in the Eastern Indo-Gangetic Plains of India.  AGRICULTURE ECOSYSTEMS & ENVIRONMENT.  195:68-82. 2014
  • Effect of different irrigation and tillage methods on yield and resource use efficiency of boro rice (Oryza sativa)..  Bangladesh Journal of Agricultural Research.  39:151-163. 2014
  • Assessing the performance of the photo-acoustic infrared gas monitor for measuring CO2, N2O, and CH4 fluxes in two major cereal rotations.  Global Change Biology.  20:287-299. 2014
  • Reprint of "Optimizing intensive cereal-based cropping systems addressing current and future drivers of agricultural change in the Northwestern Indo-Gangetic Plains of India".  AGRICULTURE ECOSYSTEMS & ENVIRONMENT.  187:33-46. 2014
  • Optimizing intensive cereal-based cropping systems addressing current and future drivers of agricultural change in the northwestern Indo-Gangetic Plains of India.  AGRICULTURE ECOSYSTEMS & ENVIRONMENT.  177:85-97. 2013
  • Evaluation of drill seeding patterns and nitrogen management strategies for wet and dry land rice.  Bangladesh Journal of Agricultural Research.  37:559-571. 2013
  • Integrating best management practices for rice with farmers’ crop management techniques: A potential option for minimizing rice yield gap.  Field Crops Research.  144:62-68. 2013
  • Weed Management Strategies to Reduce Herbicide Use in Zero-Till Rice–Wheat Cropping Systems of the Indo-Gangetic Plains.  Weed Technology.  27:241-254. 2013
  • Weedy rice: an emerging threat for direct-seeded rice production systems in India 2013
  • Comparative efficacy of pretilachlor and hand weeding in managing weeds and improving the productivity and net income of wet-seeded rice in Bangladesh.  Field Crops Research.  128:17-26. 2012
  • Using remote sensing technologies to enhance resource conservation and agricultural productivity in underutilized lands of South Asia.  Applied Geography.  32:757-765. 2012
  • Possible approaches for ecological weed management in direct-seeded rice in a changing world 2012
  • The dirt on nitrogen, soil and carbon- a step toward solving the enigma of soil N balance 2012
  • Effect of Tillage and Crop Establishment Methods on Physical Properties of a Medium-Textured Soil under a Seven-Year Rice−Wheat Rotation.  Soil Science Society of America Journal.  75:1851-1862. 2011
  • Impact of resource-conserving technologies on productivity and greenhouse gas emissions in the rice-wheat system.  Greenhouse Gases-Science and Technology.  1:261-277. 2011
  • Spatial and seasonal distribution of nitrate-N in groundwater beneath the rice–wheat cropping system of India: a geospatial analysis.  Environmental Monitoring and Assessment.  178:545-562. 2011
  • Tillage and Crop Establishment Affects Sustainability of South Asian Rice―Wheat System.  Agronomy Journal.  103:961-971. 2011
  • Stability analysis of farmer participatory trials for conservation agriculture using mixed models.  Field Crops Research.  121:450-459. 2011
  • Soil Aggregation and Associated Organic Carbon Fractions as Affected by Tillage in a Rice–Wheat Rotation in North India.  Soil Science Society of America Journal.  75:560-567. 2011
  • Direct-seeded rice culture in Sri Lanka: Lessons from farmers.  Field Crops Research.  121:53-63. 2011
  • Human-Soil Relations are Changing Rapidly: Proposals from SSSA's Cross-Divisional Soil Change Working Group.  Soil Science Society of America Journal.  75:2079-2084. 2011
  • Changes in auxin distribution patterns during lateral root development in rice.  Plant Science.  178:531-538. 2010
  • Placement effects on rice residue decomposition and nutrient dynamics on two soil types during wheat cropping in rice-wheat system in northwestern India.  Nutrient Cycling in Agroecosystems.  88:471-480. 2010
  • Productivity and resource use of direct-(drum)-seeded and transplanted rice in puddled soils in rice–rice and rice–wheat ecosystems.  Field Crops Research.  113:274-281. 2009
  • Evaluation of precision land leveling and double zero-till systems in the rice–wheat rotation: Water use, productivity, profitability and soil physical properties.  Soil & Tillage Research.  105:112-121. 2009
  • Poultry litter as a nitrogen and phosphorous source for the rice–wheat cropping system.  Biology and Fertility of Soils.  45:701-710. 2009
  • Comparison of soil properties between continuously cultivated and adjacent uncultivated soils in rice-based systems.  Biology and Fertility of Soils.  45:499-509. 2009
  • Weed management in aerobic rice systems under varying establishment methods.  Crop Protection.  27:660-671. 2008
  • Evaluation of press mud cake as a source of nitrogen and phosphorus for rice-wheat cropping system in the Indo-Gangetic plains of India.  Biology and Fertility of Soils.  44:755-762. 2008
  • Nitrogen Dynamics in Lowland Rice as Affected by Crop Establishment and Nitrogen Management.  Journal of Crop Improvement.  20:89-105. 2007
  • Saving of Water and Labor in a Rice–Wheat System with No-Tillage and Direct Seeding Technologies.  Agronomy Journal.  99:1288-1296. 2007
  • Yield and phosphorus transformations in a rice-wheat system with crop residue and phosphorus management.  Soil Science Society of America Journal.  71:1500-1507. 2007
  • Performance of site-specific nitrogen management for irrigated transplanted rice in northwestern India.  Archives of Agronomy and Soil Science.  53:567-579. 2007
  • On-farm evaluation of leaf color chart for need-based nitrogen management in irrigated transplanted rice in northwestern India.  Nutrient Cycling in Agroecosystems.  78:167-176. 2007
  • Evaluation of mulching, intercropping with Sesbania and herbicide use for weed management in dry-seeded rice (Oryza sativa L.).  Crop Protection.  26:518-524. 2007
  • Sustainability of the rice-wheat cropping system: issues, constraints, and remedial options.  Journal of Crop Improvement.  19:125-136. 2007
  • Organic Amendments Affect Soil Parameters in Two Long-Term Rice-Wheat Experiments.  Soil Science Society of America Journal.  71:442-452. 2007
  • Long-term yield trend and sustainability of rainfed soybean–wheat system through farmyard manure application in a sandy loam soil of the Indian Himalayas.  Biology and Fertility of Soils.  43:271-280. 2007
  • Simulation of Nitrogen Balance in Rice-Wheat Systems of the Indo-Gangetic Plains.  Soil Science Society of America Journal.  70:1612-1622. 2006
  • Total and organic soil carbon in cropping systems of Nepal.  Nutrient Cycling in Agroecosystems.  75:257-269. 2006
  • Metabolic engineering of rice with soybean isoflavone synthase for promoting nodulation gene expression in rhizobia.  Journal of Experimental Botany.  57:1957-1969. 2006
  • Weed management in dry-seeded rice (Oryza sativa) cultivated in the furrow-irrigated raised-bed planting system.  Crop Protection.  25:487-495. 2006
  • Nutrient management for increased productivity of rice–wheat cropping system in Bangladesh.  Field Crops Research.  96:374-386. 2006
  • Integrating rice and wheat productivity trends using the SAS mixed-procedure and meta-analysis.  Field Crops Research.  95:75-88. 2006
  • Comparison of Different Methods of Rice Establishment and Nitrogen Management Strategies for Lowland Rice 2006
  • Enhancing Soil Quality through Residue Management in a Rice‐Wheat System in Fukuoka, Japan.  Soil Science and Plant Nutrition.  51:849-860. 2005
  • Expression of the legume symbiotic lectin genes psl and gs52 promotes rhizobial colonization of roots in rice.  Plant Science.  169:726-736. 2005
  • Leaf Color Chart for Managing Nitrogen Fertilizer in Lowland Rice in Bangladesh.  Agronomy Journal.  97:949-959. 2005
  • Calibrating the leaf color chart for nitrogen management in different genotypes of rice and wheat in a systems perspective.  Agronomy Journal.  96:1606-1621. 2004
  • Optimizing phosphorus fertilization in an intensive vegetable-rice cropping system.  Biology and Fertility of Soils.  40:277-283. 2004
  • Assessing the Reliability of Permanganate-Oxidizable Carbon as an Index of Soil Labile Carbon.  Soil Science Society of America Journal.  68:969-978. 2004
  • Effects of Residue Decomposition on Productivity and Soil Fertility in Rice–Wheat Rotation.  Soil Science Society of America Journal.  68:854-864. 2004
  • Long-term effects of organic inputs on yield and soil fertility in the rice-wheat rotation.  Soil Science Society of America Journal.  68:845-853. 2004
  • Mitigating Greenhouse Gas Emissions from Rice-Wheat Cropping Systems in Asia.  Environment, Development and Sustainability.  6:65-90. 2004
  • Effects of residue decomposition on productivity and soil fertility in rice-wheat rotation.  Soil Science Society of America Journal.  68:854-864. 2004
  • Long-term effects, of organic inputs on yield and soil fertility in the rice-wheat rotation.  Soil Science Society of America Journal.  68:845-853. 2004
  • Principles and practices of tillage systems for rice-wheat cropping systems in the Indo-Gangetic Plains of South Asia 2004
  • Do organic amendments improve yield trends and profitability in intensive rice systems.  Field Crops Research.  83:191-213. 2003
  • How extensive are yield declines in long-term rice-wheat experiments in Asia?.  Field Crops Research.  81:159-180. 2003
  • Rice-wheat productivity and nutrient status in a lantana- (Lantana spp.) amended soil.  Biology and Fertility of Soils.  37:108-114. 2003
  • Trends of climatic potential and on-farm yields of rice and wheat in the Indo-Gangetic Plains.  Field Crops Research.  80:223-234. 2003
  • Sustainability of post-green revolution agriculture: the rice-wheat cropping systems of the Indo-Gangetic Plains and China. 2003
  • Technology Options for Rice in the Rice–Wheat System in South Asia 2003
  • Carbon management for sustainability of an intensively managed rice-based cropping system.  Biology and Fertility of Soils.  36:215-223. 2002
  • The role of potassium in sustaining yields in a long-term rice-wheat experiment in the Indo-Gangetic Plains of Nepal.  Biology and Fertility of Soils.  36:240-247. 2002
  • Infection and colonization of rice seedlings by the plant growth-promoting bacterium Herbaspirillum seropedicae Z67..  Molecular Plant-microbe Interactions.  15:894-906. 2002
  • Chlorophyll Meter– and Leaf Color Chart–Based Nitrogen Management for Rice and Wheat in Northwestern India.  Agronomy Journal.  94:821-829. 2002
  • Influence of Rhizobial Inoculation on Photosynthesis and Grain Yield of Rice.  Agronomy Journal.  94:925-929. 2002
  • Efficacy of three 15N labelling techniques for estimating below-ground N in Sesbania rostrata.  Biology and Fertility of Soils.  35:387-389. 2002
  • Yield and Soil Fertility Trends in a 20‐Year Rice–Rice–Wheat Experiment in Nepal.  Soil Science Society of America Journal.  66:857-867. 2002
  • Herbaspirillum colonization increases growth and nitrogen accumulation in aluminium-tolerant rice varieties.  New Phytologist.  154:131-145. 2002
  • Chlorophyll meter- and leaf color chart-based nitrogen management for rice and wheat in northwestern India.  Agronomy Journal.  94:821-829. 2002
  • Nature of the Beneficial Rhizobium leguminosarum Bv. Trifolii — Rice Association 2002
  • Nitrate pollution in groundwater and strategies to reduce pollution.  Water Science and Technology.  45:29-35. 2002
  • Stomatal characteristics of new plant type rice developed by International Rice Research Institute 2002
  • Using crop simulation models and GIS for evaluating yield variability and sustainability in rice-based cropping systems 2002
  • Yield and Soil Nutrient Changes in a Long‐Term Rice‐Wheat Rotation in India.  Soil Science Society of America Journal.  66:162-170. 2002
  • Yield and soil fertility trends in a 20-year rice-rice-wheat experiment in Nepal.  Soil Science Society of America Journal.  66:857-867. 2002
  • Yield and soil nutrient changes in a long-term rice-wheat rotation in India.  Soil Science Society of America Journal.  66:162-170. 2002
  • Evaluation of plant growth promoting and colonization ability of endophytic diazotrophs from deep water rice.  Journal of Biotechnology.  91:127-141. 2001
  • Specific detection of Bradyrhizobium and Rhizobium strains colonizing rice (Oryza sativa) roots by 16S-23S ribosomal DNA intergenic spacer-targeted PCR..  Applied and Environmental Microbiology.  67:3655-3664. 2001
  • Long-term changes in yield and soil fertility in a twenty-year rice-wheat experiment in Nepal.  Biology and Fertility of Soils.  34:73-78. 2001
  • Endophytic Colonization of Rice by a Diazotrophic Strain of Serratia marcescens.  Journal of Bacteriology.  183:2634-2645. 2001
  • Novel Endophytes of Rice form a Taxonomically Distinct Subgroup of Serratia marcescens.  Systematic and Applied Microbiology.  24:245-251. 2001
  • The beneficial plant growth-promoting association of Rhizobium leguminosarum bv. trifolii with rice roots.  Australian Journal of Plant Physiology.  28:845-870. 2001
  • Recycling of residual soil nitrogen in a lowland rice-sweet pepper cropping system.  Soil Science Society of America Journal.  64:1689-1698. 2000
  • Rhizobial Inoculation Influences Seedling Vigor and Yield of Rice.  Agronomy Journal.  92:880-886. 2000
  • Effect of Indigo and Maize as Nitrogen Catch Crops on Root Growth and Nitrogen Use in Rice in Rainfed Lowland Ecosystems in Northern Philippines..  Japanese journal of tropical agriculture.  44:12-19. 2000
  • Legume Decomposition and Nitrogen Release When Applied as Green Manures to Tropical Vegetable Production Systems.  Agronomy Journal.  92:253-260. 2000
  • Tomato crop response to short-duration legume green manures in tropical vegetable systems..  Agronomy Journal.  92:245-253. 2000
  • Diversity of Endophytic Diazotrophs and Mechanism of Endophytic Colonization in Deepwater Rice 2000
  • Evaluation of lacZ and gusA markers to study Rhizobial colonization in rice roots 2000
  • Exploring the Genetic Potential of Rice for Forming Symbiotic Associations with Rhizobia 2000
  • Long-term effects of urea and green manure on rice yields and nitrogen balance.  Soil Science Society of America Journal.  64:1993-2001. 2000
  • Nutrient amendments influence endophytic colonization of rice by Serratia marcescens IRBG500 and Herbaspirillum seropedicae Z67.  JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY.  10:694-699. 2000
  • Rhizobia inoculation improves nutrient uptake and growth of lowland rice.  Soil Science Society of America Journal.  64:1644-1650. 2000
  • Tomato crop response to short-duration legume green manures in tropical vegetable systems.  Agronomy Journal.  92:245-253. 2000
  • Use of 15N-labeled soil in measuring nitrogen fertilizer recovery efficiency in transplanted rice..  Soil Science Society of America Journal.  64:235-239. 2000
  • Widespread Occurrence of the Homologues of the Early Nodulin (ENOD) Genes in Oryza Species and Related Grasses.  Biochemical and Biophysical Research Communications.  258:148-154. 1999
  • ROLE OF INDIGO IN IMPROVING THE PRODUCTIVITY OF RAINFED LOWLAND RICE-BASED CROPPING SYSTEMS.  Experimental Agriculture.  35:201-210. 1999
  • Rice ENOD40: isolation and expression analysis in rice and transgenic soybean root nodules.  Plant Journal.  18:121-129. 1999
  • Yield trends and apparent nutrient balances in intensified and diversified rice-based cropping systems.  Experimental Agriculture.  35:181-199. 1999
  • Ecology and Plant Growth-Promoting Activities of the Natural Association between Rhizobium Leguminosarum Bv. Trifolii and Rice Roots 1999
  • Influence of available nitrogen and rice genotype on associative dinitrogen fixation.  Soil Science Society of America Journal.  63:93-99. 1999
  • Interactions of rice seedlings with bacteria isolated from rice roots.  Australian Journal of Plant Physiology.  26:521-535. 1999
  • Sustaining productivity of lowland rice soils: issues and options related to N availability..  Nutrient Cycling in Agroecosystems.  53:19-33. 1999
  • Transgenic rice harboring legume ENOD40 gene 1999
  • ISOLATION, ANALYSIS AND EXPRESSION OF HOMOLOGUES OF THE SOYBEAN EARLY NODULIN GENE GMENOD93 (GMN93) FROM RICE.  BIOCHIMICA ET BIOPHYSICA ACTA-GENE STRUCTURE AND EXPRESSION.  1443:386-392. 1998
  • Nitrate in Groundwater and Integration of Nitrogen‐Catch Crop in Rice‐Sweet Pepper Cropping System.  Soil Science Society of America Journal.  62:1610-1619. 1998
  • Genotypic variation in nitrogen use efficiency in medium- and long-duration rice.  Field Crops Research.  58:35-53. 1998
  • Recycling in situ of Legume-Fixed and Soil Nitrogen in Tropical Lowland Rice.  Agronomy Journal.  90:429-437. 1998
  • Opportunities to manipulate nutrient-by-water interactions in rainfed lowland rice systems.  Field Crops Research.  56:93-112. 1998
  • Natural Beneficial Association of Rhizobium leguminosarum bv. trifolii and Rice Roots and its Relevance to Sustainable Agriculture 1998
  • Nitrogen dynamics in intensive rainfed lowland rice-based cropping systems and strategies to improve efficiency 1998
  • Nitrogen dynamics of various green manure species and the relationship to lowland rice production.  Agronomy Journal.  90:149-154. 1998
  • Nondestructive Estimation of Shoot Nitrogen in Different Rice Genotypes.  Agronomy Journal.  90:33-40. 1998
  • Rhizobial lipochitooligosaccharide nodulation factors activate expression of the legume early nodulin gene ENOD12 in rice.  Plant Journal.  14:693-702. 1998
  • Round Table: Agriculture 2020: 8 billion people 1998
  • Introduction: Assessing opportunities for nitrogen fixation in rice — a frontier project.  Plant and Soil.  194:1-10. 1997
  • Isolation of endophytic bacteria from rice and assessment of their potential for supplying rice with biologically fixed nitrogen.  Plant and Soil.  194:25-36. 1997
  • Isolation of endophytic diazotrophic bacteria from wetland rice.  Plant and Soil.  194:15-24. 1997
  • Rhizobial communication with rice roots: Induction of phenotypic changes, mode of invasion and extent of colonization.  Plant and Soil.  194:81-98. 1997
  • Nitrogen Dynamics and Balance in Intensified Rainfed Lowland Rice-Based Cropping Systems.  Soil Science Society of America Journal.  61:812-821. 1997
  • Effect of growing rice on nitrogen mineralization in flooded soil.  Soil Science Society of America Journal.  61:839-845. 1997
  • Natural endophytic association between Rhizobium leguminosarum bv. trifolii and rice roots and assessment of its potential to promote rice growth.  Plant and Soil.  194:99-114. 1997
  • Sesbania phosphorus requirements when used as biofertilizer for long-term rice cultivation.  Soil Science Society of America Journal.  61:1240-1244. 1997
  • Adaptation of green manure legumes to adverse conditions in rice lowlands.  Biology and Fertility of Soils.  23:243-248. 1996
  • Grain yield performance of rice genotypes at suboptimal levels of soil N as affected by N uptake and utilization efficiency.  Field Crops Research.  46:127-143. 1996
  • Genotypic variation in promotion of rice dinitrogen fixation as determined by nitrogen-15 dilution.  Soil Science Society of America Journal.  60:1815-1821. 1996
  • Legume Productivity and Soil Nitrogen Dynamics in Lowland Rice-Based Cropping Systems.  Soil Science Society of America Journal.  60:183-192. 1996
  • Tillage depth influence on soil nitrogen distribution and availability in a rice lowland.  Soil Science Society of America Journal.  60:1153-1159. 1996
  • Molecular-marker-facilitated investigation on the ability to stimulate N2 fixation in the rhizosphere by irrigated rice plants.  Theoretical and Applied Genetics.  91:1177-1183. 1995
  • Non-allelic interaction conditioning spikelet sterility in an F2 population of indica/japonica cross in rice..  Theoretical and Applied Genetics.  91:825-829. 1995
  • Biological N2 fixation by heterotrophic and phototrophic bacteria in association with straw.  Plant and Soil.  174:211-224. 1995
  • Biological nitrogen fixation: An efficient source of nitrogen for sustainable agricultural production?.  Plant and Soil.  174:3-28. 1995
  • Enhancing legume N2 fixation through plant and soil management.  Plant and Soil.  174:83-101. 1995
  • Enhancing soil nitrogen use and biological nitrogen fixation in Wetland rice.  Experimental Agriculture.  31:261-277. 1995
  • Green manure technology: Potential, usage, and limitations. A case study for lowland rice.  Plant and Soil.  174:181-194. 1995
  • Stem-nodulating legumes as relay-cropped or intercropped green manures for lowland rice.  Field Crops Research.  42:39-47. 1995
  • Influence of phosphorus or phosphorus-potassium fertilization on biomass and dinitrogen fixation of the stem-nodulating green-manure legume Sesbania rostrata in different marginally productive wetland rice soils.  Biology and Fertility of Soils.  20:107-112. 1995
  • Crop residue effects on nitrogen mineralization, microbial biomass, and rice yield in submerged soils.  Soil Science Society of America Journal.  59:1595-1603. 1995
  • Efficient management of soil and biologically fixed N2 in intensively-cultivated rice fields.  Soil Biology & Biochemistry.  27:431-439. 1995
  • Agronomic and economic evaluation of Sesbania rostrata green manure establishment in irrigated rice.  Field Crops Research.  40:135-141. 1995
  • Extension of nitrogen fixation to rice — Necessity and possibilities.  GeoJournal.  35:363-372. 1995
  • BIOLOGICAL NITROGEN-FIXATION - AN EFFICIENT SOURCE OF NITROGEN FOR SUSTAINABLE AGRICULTURAL PRODUCTION.  Plant and Soil.  174:3-28. 1995
  • ENHANCING LEGUME N-2 FIXATION THROUGH PLANT AND SOIL-MANAGEMENT.  Plant and Soil.  174:83-101. 1995
  • GREEN MANURE TECHNOLOGY - POTENTIAL, USAGE, AND LIMITATIONS - A CASE-STUDY FOR LOWLAND RICE.  Plant and Soil.  174:181-194. 1995
  • Genetic analysis of rice varietal ability to stimulate associative N2 fixation using 15N-dilution method and RFLP markers 1995
  • Nitrogen Dynamics of Grain Legume–Weedy Fallow–Flooded Rice Sequences in the Tropics.  Agronomy Journal.  87:1-6. 1995
  • Nitrogen Losses and Lowland Rice Yield as Affected by Residue Nitrogen Release.  Soil Science Society of America Journal.  58:1660-1665. 1994
  • Parameters Affecting Residue Nitrogen Mineralization in Flooded Soils.  Soil Science Society of America Journal.  58:1666-1671. 1994
  • Photosynthetic symbionts of Aeschynomene spp. form a cluster with bradyrhizobia on the basis of fatty acid and rRNA analyses..  INTERNATIONAL JOURNAL OF SYSTEMATIC BACTERIOLOGY.  44:392-403. 1994
  • Legumes as Nitrate Catch Crops During the Dry-to-Wet Transition in Lowland Rice Cropping Systems.  Agronomy Journal.  86:267-273. 1994
  • Phylogenetic analysis of Bradyrhizobium japonicum and photosynthetic stem-nodulating bacteria from Aeschynomene species grown in separated geographical regions.  Applied and Environmental Microbiology.  60:940-946. 1994
  • Prediction of nitrogen availability and rice yield in lowland soils : nitrogen mineralization parameters.  Plant and Soil.  160:131-137. 1994
  • Effect of six rice genotypes on apparent nitrogen mineralization in a submerged soil 1994
  • NUMERICAL TAXONOMY OF PHOTOSYNTHETIC RHIZOBIA NODULATING AESCHYNOMENE SPECIES.  INTERNATIONAL JOURNAL OF SYSTEMATIC BACTERIOLOGY.  44:62-73. 1994
  • Nitrate Dynamics during the Aerobic Soil Phase in Lowland Rice‐Based Cropping Systems.  Soil Science Society of America Journal.  57:1526-1532. 1993
  • Automated elemental analysis: A rapid and reliable but expensive measurement of total carbon and nitrogen in plant and soil samples.  Communications in Soil Science and Plant Analysis.  24:1897-1924. 1993
  • ESTIMATING DINITROGEN FIXATION OF HEDGEROW VEGETATION USING THE N-15 NATURAL-ABUNDANCE METHOD.  Soil Science Society of America Journal.  57:732-737. 1993
  • Prospects and Problems of Biological Nitrogen Fixation in Rice Production: A Critical Assessment 1993
  • Isotope 15N enrichment of soil-ammonium N as a reference to estimate N2 fixation by stem and root-inoculated S. rostrata.  Biology and Fertility of Soils.  13:74-78. 1992
  • Biological N2 Fixation in wetland rice fields: Estimation and contribution to nitrogen balance.  Plant and Soil.  141:41-55. 1992
  • Biological nitrogen fixation for sustainable agriculture: A perspective.  Plant and Soil.  141:1-11. 1992
  • Managing native and legume-fixed nitrogen in lowland rice-based cropping systems.  Plant and Soil.  141:69-91. 1992
  • BIOLOGICAL N2 FIXATION IN WETLAND RICE FIELDS - ESTIMATION AND CONTRIBUTION TO NITROGEN-BALANCE.  Plant and Soil.  141:41-55. 1992
  • RELATIVE CONTRIBUTIONS TO NITROGENASE (ACETYLENE REDUCING) ACTIVITY OF STEM AND ROOT-NODULES IN SESBANIA-ROSTRATA.  Canadian Journal of Microbiology.  38:577-583. 1992
  • EFFECT OF NPK ON GROWTH AND NITROGEN FIXATION OF SESBANIA ROSTRATA AS A GREEN MANURE FOR LOWLAND RICE (ORYZA SATIVA L.).  Plant and Soil.  132:149-158. 1991
  • NITROGEN ACCUMULATION AND CHANGES IN NATURAL N-15 ABUNDANCE IN THE TISSUES OF LEGUMES WITH EMPHASIS ON N2 FIXATION BY STEM-NODULATING PLANTS IN UPLAND AND PADDY FIELDS.  Soil Science and Plant Nutrition.  37:75-82. 1991
  • Stem nodule symbiosis: A system with several unusual features 1991
  • Estimating N2 fixation by Sesbania rostrata and S. cannabina (syn. S. aculeata) in lowland rice soil by the 15N dilution method.  Biology and Fertility of Soils.  10:77-88. 1990
  • ESTIMATING N2 FIXATION BY SESBANIA-ROSTRATA AND S CANNABINA (SYN S ACULEATA) IN LOWLAND RICE SOIL BY THE N-15 DILUTION METHOD.  Biology and Fertility of Soils.  10:77-88. 1990
  • Einfluß von NPK auf die Biomasseproduktion und Stickstoffbindung der stengelknöllchenbildenden Gründüngungsleguminosen Sesbania rostrata und Aeschynomene afraspera im Naßreisanbau.  Journal of Plant Nutrition and Soil Science.  153:333-339. 1990
  • Growth and N2-fixation of two stem-nodulating legumes and their effect as green manure on lowland rice.  Soil Biology & Biochemistry.  22:1109-1119. 1990
  • Stem-nodule symbiosis and its unusual properties. 1990
  • Sesbania rostrata as a green manure for lowland rice: Growth, N2 fixation,Azorhizobium sp. inoculation, and effects on succeeding crop yields and nitrogen balance.  Biology and Fertility of Soils.  7:191-197. 1989
  • Survival of Azorhizobium caulinodans in the Soil and Rhizosphere of Wetland Rice under Sesbania rostrata-Rice Rotation..  Applied and Environmental Microbiology.  55:454-460. 1989
  • Effect of inorganic N and organic fertilizers on nitrogen-fixing (acetylene-reducing) activity associated with wetland rice plants 1989
  • Studies on growth and N2-fixation by two stem-nodulating legumes and their effect as green manure on lowland rice 1989
  • The effect of straw application on chemical and microbiological properties of a wetland rice soil 1989
  • Seeding vs. vegetative propagations of the stem-nodulating green manure Sesbania rostrata.  Biology and Fertility of Soils.  6:279-281. 1988
  • Influence of Azospirillum inoculation on the mineral uptake and growth of rice under hydroponic conditions.  Plant and Soil.  108:281-285. 1988
  • A plant sampling procedure for acetylene reduction assay to detect rice varietal differences in ability to stimulate N2 fixation.  Soil Biology & Biochemistry.  20:175-183. 1988
  • The effects on N2 fixation (C2H2 reduction), bacterial population and rice plant growth of two modes of straw application to a wetland rice field.  Biology and Fertility of Soils.  5:106-111. 1987
  • Differential colonization of Azospirillum lipoferum on roots of two varieties of rice (Oryza sativa L.).  Biology and Fertility of Soils.  4:3-7. 1987
  • Composition of Azospirillum species associated with wetland rice plant grown in different soils..  Plant and Soil.  102:127-129. 1987
  • new nitrogen-fixing species of pseudomonad: Pseudomonas diazotrophicus sp. nov. isolated from the root of wetland rice 1987
  • The fate of markerAzospirillum lipoferum inoculated into rice and its effect on growth, yield and N2 fixation of plants studied by acetylene reduction,15N2 feeding and15N dilution techniques.  Biology and Fertility of Soils.  2:7-14. 1986
  • Laboratory acetylene reduction assay for relative measurement of N2-fixing activities associated with field-grown wetland rice plants.  Plant and Soil.  90:359-372. 1986
  • new nitrogen-fixing species of Pseudomonas: P. diazotrophicus sp. isolated from the root of wetland rice 1986
  • ANTIGENIC ANALYSIS OF ANABAENA AZOLLAE AND THE ROLE OF LECTIN IN THE AZOLLA–ANABAENA SYMBIOSIS.  New Phytologist.  98:295-300. 1984
  • Antigenic similarity among Anabaena azollae separated from different species of Azolla..  Biochemical and Biophysical Research Communications.  109:675-682. 1982
  • Azospirilla Associated With Wetland Rice As Identified By Immunological Techniques 1982

• document

  • The Nitrogen Dilemma Good and Bad : Opportunities for enhanced NUE and reduced losses in cereal production 2017
  • Weed management role in increasing crop yield and doubling rice farmers? income in India - An analysis 2017
  • What changes in rice cultivation are on the Horizon? 2016
  • Weeds and weed control in finger millet in India - A review 2015
  • Weed management research in India - an analysis ofpast and outlook for future 2014
  • Evaluation of precision land leveling and double zero-till systems in the rice-wheat rotation: Water use, productivity, profitability and soil physical properties 2009
  • Performance of furrow-irrigated raised beds in rice-wheat cropping systems of the Indo-Gangetic Plain 2008
  • Improving the recovery efficiency of fertilizer nitrogen in cereals 2005
  • Photosynthetic efficiency of a new plant type of rice developed by the International Rice Research Institute 2005
  • Assessing the genetic propensity of rice for nodulation 2003
  • How extensive are yield declines in long-term rice-wheat experients in Asia 2003
  • Improving the productivity and sustainability of rice-wheat systems: Issues and impacts 2003
  • Progress in multinational collaborative studies on the beneficial association between Rhizobium leguminosarum bv. trifolii and rice 2000
  • Innovative nitrogen management strategies for lowland rice systems 1995
  • Introduction: feasibility of nodulation and nitrogen fixation in rice 1992
  • Biofertilizer germplasm collections in soil microbiology division 1991
  • Estimation of biological N 2 fixation and its contribution to nitrogen balance in wetland rice fields 1990
  • Epiphytic Occurrence Of Azorhizobium-Caulinodans And Other Rhizobia On Host And Nonhost Legumes 1989
  • Survival Of Azorhizobium Caulinodans In The Soil And Rhizosphere Of Wetland Rice Under Sesbania Rostrata-Rice Rotation 1989
  • Nitrogen fixation by leguminous green manure and practices for its enhancement in tropical lowland rice 1988
  • plant sampling procedure for acetylene reduction assay to detect rice varietal differences in N2 fixation stimulation ability 1986
  • Nitrogen fixation associated with rice seedlings grown under gnotobiotic conditions 1984
  • Isolation and identification of nitrogen-fixing Enterobacter cloacae and Klebsiella planticola associated with rice plants 1983
  • Immunological techniques for the identification and ecological study of N2 fixing microorganisms associated with rice plants 1982
  • Immunological techniques to identify Azospirillum associated with wetland rice 1982
  • Blue-green algae (cyanobacteria) - some aspects related to their role as sources of fixed nitrogen in paddy soils 1978
  • Rice cultivars differences in relation to biological nitrogen fixation and soil N utilization efficiency

• editorial article

  • Fields on fire: Alternatives to crop residue burning in India.  Science.  365:536-+. 2019

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  • Role of Nitrogen Fertilization in Sustaining Organic Matter in Cultivated Soils.  Journal of Environmental Quality. 1756-1766. 2011
  • Using remote sensing technologies to enhance resource conservation and agricultural productivity in underutilized lands of South Asia 2011
  • Nitrogen fixation in rice systems: state of knowledge and future prospects.  Plant and Soil. 151-167. 2003
  • Estimation of legume symbiotic dependence: an evaluation of techniques based on 15N dilution.  Soil Biology & Biochemistry. 1901-1917. 1999
  • Introduction: Assessing opportunities for nitrogen fixation in rice - a frontier project.  Plant and Soil. 1-10. 1997
  • MANAGEMENT OF BIOLOGICAL NITROGEN-FIXATION FOR THE DEVELOPMENT OF MORE PRODUCTIVE AND SUSTAINABLE AGRICULTURAL SYSTEMS - EXTENDED VERSIONS OF PAPERS PRESENTED AT THE SYMPOSIUM ON BIOLOGICAL NITROGEN-FIXATION FOR SUSTAINABLE AGRICULTURE AT THE 15TH CONGRESS OF SOIL SCIENCE, ACAPULCO, MEXICO, 1994 - PREFACE.  Plant and Soil. 1-1. 1995
  • EXTENDED VERSIONS OF PAPERS PRESENTED IN THE SYMPOSIUM ROLE OF BIOLOGICAL NITROGEN-FIXATION IN SUSTAINABLE AGRICULTURE AT THE 13TH INTERNATIONAL-CONGRESS OF SOIL SCIENCE - KYOTO, JAPAN, 1990 - PREFACE.  Plant and Soil. R7-R7. 1992

• review

  • Achieving the sustainable development goals in agriculture: The crucial role of nitrogen in cereal-based systems.  Advances in Agronomy. 39-116. 2020
  • Preventive Weed Management in Direct-Seeded Rice: Targeting the Weed Seedbank.  Advances in Agronomy. 45-142. 2017
  • Improvement of cereal-based cropping systems following the principles of conservation agriculture under changing agricultural scenarios in Bangladesh.  Field Crops Research. 1-15. 2015
  • Direct Seeding of Rice: Recent Developments and Future Research Needs.  Advances in Agronomy. 297-413. 2011
  • Evaluation of alternative tillage and crop establishment methods in a rice-wheat rotation in North Western IGP.  Field Crops Research. 260-267. 2010
  • Weed Management in Direct‐Seeded Rice.  Advances in Agronomy. 153-+. 2007
  • Efficiency of Fertilizer Nitrogen in Cereal Production: Retrospects and Prospects.  Advances in Agronomy. 85-156. 2005
  • Opportunities for increased nitrogen-use efficiency from improved lowland rice germplasm.  Field Crops Research. 41-71. 1998
  • Opportunities for increased nitrogen-use efficiency from improved resource management in irrigated rice systems.  Field Crops Research. 7-39. 1998