research area of Kamara, Alpha, Savannah Systems Agronomist, IITA, IITA Menkir, Abebe, Maize Breeder, IITA, IITA
subject area of A Nitrogen-led Model of Grass Growth Agronomic response of drought-tolerant and Striga-resistant maize cultivars to nitrogen fertilization in the Nigerian Guinea savannahs. Assessment of nitrogen uptake and utilization in drought tolerant and Striga resistant tropical maize varieties Atmospheric nitrogen fixation by photosynthetic microorganisms in a submerged Philippine soil Barley yield formation under abiotic stress depends on the interplay between flowering time genes and environmental cues Barley yield formation under abiotic stress depends on the interplay between flowering time genes and environmental cues. Correlations between indexes of soil nitrogen availability and nitrogen percent in plant, nitrogen uptake, and dry-matter yield of rice grown in the greenhouse Critical nitrogen concentrations: implications for high-yielding rice (Oryza sativa L.) cultivars in the tropics DECOMPOSITION OF RICE RESIDUE IN TROPICAL SOILS : I. Nitrogen Uptake by Rice Plants from Straw Incorporated, Fertilizer (Ammonium Sulfate) and Soil Different response of an elite Bt restorer line of hybrid rice (Oryza sativa L.) in adaptation to nitrogen deficiency Differential 13C isotopic discrimination in maize at varying water stress and at low to high nitrogen availability Differential response of six cowpea (Vigna unguiculata (L.) Walp) cultivars to liming in an ultisol Drought response of rice at different nitrogen levels using line source sprinkler system Dry season soil conditions and soil nitrogen availability to wet season wetland rice Effects of season-dependent irradiance levels and nitrogen-deficiency on photosynthesis and photoinhibition in field-grown rice (Oryza sativa) Enhancing soil nitrogen use and biological nitrogen fixation in Wetland rice From ORYZA2000 to ORYZA (v3): An improved simulation model for rice in drought and nitrogen-deficient environments. Genotypic variability among peanut (Arachis hypogea L.) in sensitivity of nitrogen fixation to soil drying Identification of QTL for early vigor and leaf senescence across two tropical maize doubled haploid populations under nitrogen deficient conditions Identification of Tropical Maize Germplasm with Tolerance to Drought, Nitrogen Deficiency, and Combined Heat and Drought Stresses Immobilization, mineralization and availability to rice plants of nitrogen derived from heterotrophic nitrogen fixation in flooded soil Leaf senescence induced by nitrogen deficiency as indicator of genotypic differences in nitrogen efficiency in tropical maize Long-term Comparison of the Agronomic Efficiency and Residual Benefits of Organic and Inorganic Nitrogen Sources for Tropical Lowland Rice Movement and distribution of fertilizer nitrogen as affected by depth of placement in wetland rice Nitrogen supplying ability of paddy soils under field conditions in the Philippines Nitrogen use efficiency and nitrogen-15 balances in broadcast-seeded flooded and transplanted rice PERFORMANCE OF DIVERSE MAIZE GENOTYPES UNDER NITROGEN DEFICIENCY IN THE NORTHERN GUINEA SAVANNA OF NIGERIA QTL mapping for nitrogen-use efficiency and nitrogen-deficiency tolerance traits in rice Soil test-based nutrient balancing improved crop productivity and rural livelihoods: case study from rainfed semi-arid tropics in Andhra Pradesh, India THE RELATIONSHIP BETWEEN COMBINED NITROGEN UPTAKES AND NITROGEN FIXATION IN AZOLLAâANABAENA SYMBIOSIS Temporal origin of nitrogen in the grain of irrigated rice in the dry season: the outcome of uptake, cycling, senescence and competition studied using a 15N-point placement technique The fixation of atmospheric nitrogen in the rice rhizosphere Transformation of soil and fertilizer nitrogen in paddy soil and their availability to rice plants