| There is a great deal of variability among grain sorghum (Sorghum bicolor (L) Moench) genotypes for N (NO;Tropical lines selected under low N environment had greater capabilities to extracting N from the soil. Their rapid growth rate gave them a greater N biomass use efficiency compared to the hybrids and U.S. adapted lines which had greater grain yield potential and more favorable dry matter partitioning to grain resulting in greater grain N use efficiency. Nitrate reductase activity (NRA) did not appear to be the most limiting factor in N accumulation and use by the grain sorghum genotypes tested. The NRA decreased with plant developmental age and did not correlate to plant total N, total biomass production, nor grain yield. The study showed that grain sorghum preferred NH... |
