Abstract Environmental controls which are dependent on the soil are known as edaphic factors. Variations in soils supply as a medium in plant growth may lead to restrictions in the functioning and distribution of organisms and hence influence the structur

摘要

Integrated nitrogen management and its application at suitable time is critical for increased soil productivity and crop sustainability. The objective of the current study was to evaluate the effect of crop residues, its application time and suitable application stage for nitrogen fertilization on yield of maize (Zea may L.) The experiment was conducted during summer 2014and experimental design was randomized complete block (RCB) design having four replications. Cereal and legume residues at the rate of 5 t ha-1 each were applied at three different stages, i.e. 15 days before sowing, 7 days before sowing and at sowing while fertilizer nitrogen was applied at the rate of 100 kg ha-1in full and split doses at various growth stages (sowing and V6 stages). The results showed that legume residues resulted in higher grains ear-1 (298), 1000 grains weight (204 g) and grain yield (2290 kg ha-1). Among nitrogen application stages, split application resulted in maximum ears plant-1 (0.87), grains ear-1 1000 GW (208 g), stover yield (8269 kg ha-1) and grain yield (2414 kg ha-1). Results presented that cereal residues and full dose of nitrogen at any stage performed poorly and resulted in least values of these parameters. It is concluded that legume residues at the rate of 5 t ha-1 along with the split application of nitrogen at the rate of 120 kg ha-1 maximized the productivity of maize.