subject area of A model for predicting the fate of nitrogen fertilizer in lowland ricefields. I: Theory Accumulation of ammonium-N and amino-N in theAzolla-Anabaena association Ammonia-oxidizing bacteria on root biofilms and their possible contribution to N use efficiency of different rice cultivars Ammonium Production in Submerged Soils and Sediments: The Role of Reducible Iron Ammonium dynamics of puddled soils in relation to growth and yield of lowland rice Ammonium fixation in some tropical rice soils Ammonium fluxes into plant roots: Energetics, kinetics and regulation Ammonium sulphate fertiliser increases larval populations of Anopheles arabiensis and culicine mosquitoes in rice fields. Availability of N from Casuarina residues and inorganic N to maize, using 15N isotope techniques Clay mineralogical and ammonium fixation characteristics of some tropical upland rice soils Comparative Ammonium and Potassium Fixation by some Wetland Rice Soil Clays as Affected by Mineralogical Composition and Treatment Sequence Contribution of fallow periods between rice crops to seasonal GHG emissions: effect of water and tillage management Correlations between indexes of soil nitrogen availability and nitrogen percent in plant, nitrogen uptake, and dry-matter yield of rice grown in the greenhouse Cultivar, nitrogen, and water effects on productivity, and nitrogen-use efficiency and balance for rice–wheat sequences of Bangladesh DYNAMICS OF AVAILABLE NITROGEN IN PADDY SOILS : I. Changes in Available N during Rice Cultivation and Origin of N Differences in uptake kinetics of ammonium and nitrate in legumes and cereals Different nitrogen rates and methods of application for dry season rice cultivation with alternate wetting and drying irrigation: Fate of nitrogen and grain yield EDTA extractable phosphorus in soils as related to available and inorganic phosphorus forms Effect of Sesbania, Azolla and rice straw incorporation on the kinetics of NH4, K, Fe, Mn, Zn and P in some flooded rice soils Effect of exogenous ammonium on glutamine synthetase, glutamate synthase, and glutamate dehydrogenase in the root of rice seedling Effect of fertilizer rate and form on the recovery of 15N-labelled fertilizer applied to wheat in Syria Effect of submergence on subsequent nitrification in a wetland cultivated rice soil Effects of Nitrification Inhibitors on Nitrogen Transformations, Other Than Nitrification, in Soils Efficiency of fertilizer use by a rain-fed wheat crop following split-application of fertilizer nitrogen Enhanced anther culture efficiency of indica rice (Oryza sativa L.) through modification of the culture media Error caused by carbon dioxide in determination of ammonium by direct steam distillation of tropical wetland rice soils Evaluation of some chemical extractants for determination of exchangeable ammonium in tropical rice soils Evaluation of some chemical indexes for predicting mineralizable nitrogen in tropical rice soils Evaluation of the nitrification inhibitor (nitrapyrin) application to a soil‐water system for conservation of ammonium released under water logged incubation of soils Field Studies Using 15N Dilution Techniques on Azolla N Contribution to Rice in Nigeria Fixed ammonium and carbon-nitrogen ratios of some semi-arid tropical Indian soils Immobilization, mineralization and availability to rice plants of nitrogen derived from heterotrophic nitrogen fixation in flooded soil Improvement in nitrogen availability, nitrogen uptake and growth of aerobic rice following soil acidification Influence of Different Cultivars on Populations of Ammonia-Oxidizing Bacteria in the Root Environment of Rice Influence of different nitrogen inputs on the members of ammonium transporter and glutamine synthetase genes in two rice genotypes having differential responsiveness to nitrogen. Is nitrate reduced to ammonium in waterlogged acid sulfate soil Isotope 15N enrichment of soil-ammonium N as a reference to estimate N2 fixation by stem and root-inoculated S. rostrata Long-Term Nitrogen Fertilization Impacts on Soil Bacteria, Grain Yield and Nitrogen Use Efficiency of Wheat in Semiarid Loess Plateau, China Modelling the quantitative evaluation of soil nutrient supply, nutrient use efficiency, and fertilizer requirements of wheat in India Movement and distribution of fertilizer nitrogen as affected by depth of placement in wetland rice Nitrification and mineralization potentials in a limed Ultisol in the humid tropics Nitrogen Availability Indexes for Submerged Rice Soils Nitrogen Fixation Associated with the Rice Plant Grown in Water Culture Nitrogen fixation throughout growth, and varietal differences in nitrogen fixation by the rhizosphere of rice planted in pots Nitrogen losses from labelled ammonium sulphate and Urea applied to a flooded rice soil Nitrogen mineralization in lowland rice soils: The role of organic matter quantity and quality Nitrogen supplying ability of some Philippine rice soils. Nitrogen-15 balance in transplanted and direct-seeded flooded rice as affected by different methods of urea application On the extent to which root properties and transport through the soil limit nitrogen uptake by lowland rice Organic Matter and Mineralizable Nitrogen Relationships in Wetland Rice Soils Phosphate solubilization by organic anion excretion from rice growing in aerobic soil: rates of excretion and decomposition, effects on rhizosphere pH and effects on phosphate solubility and uptake Phosphorus seed coating increases phosphorus uptake, early growth and yield of pearl millet (Pennisetum glaucum (L.) R. Br.) grown on an acid sandy soil in Niger, West Africa Plant-mediated processess to acquire nutrients: nitrogen uptake by rice plants Production and storage of N-enriched co-compost. Quantitative study on nitrification in flooded rice soil Readily available concentrations of selected micronutrients and harmful metals in soils of Sub-Saharan Africa Response of ammonia-oxidizing bacteria and archaea to biochemical quality of organic inputs combined with mineral nitrogen fertilizer in an arable soil Response of glutamine synthetase isoforms to nitrogen sources in rice (Oryza sativa L.) roots Simple modification of the Walkley-Black method for simultaneous determination of organic carbon and potentially mineralizable nitrogen in tropical rice soils Stream and shallow groundwater nutrient concentrations in an Ozark forested riparian zone of the central USA THE RELATIONSHIP BETWEEN COMBINED NITROGEN UPTAKES AND NITROGEN FIXATION IN AZOLLA‐ANABAENA SYMBIOSIS The chemistry of the lowland rice rhizosphere The effects of climate on decomposition of cattle, sheep and goat manure in Kenyan tropical pastures The importance of initial exchangeable ammonium in the nitrogen nutrition of lowland rice soils Tissue and nitrogen-linked expression profiles of ammonium and nitrate transporters in maize. Understanding the differential nitrogen sensing mechanism in rice genotypes through expression analysis of high and low affinity ammonium transporter genes. Use of modelling to understand plant nutrient acquisition Volatilization of ammonia from submerged tropical soils.