Influence of sowing density, nitrogen fertilizer level and splitting on yield and yield components of wheat

Abstract

In order to evaluate the effect of different levels of sowing density, nitrogen fertilizer level and splitting, an experiment was conducted as a split-split plot based on randomized complete block design with 4 replications in 2010-2011. The factors were, sowing density in four levels (100, 250, 400 and 550 seeds per m 2 ) as the main factor, nitrogen fertilizer splitting in three levels (no splitting (pre-sowing), splitting in 2 steps (tillering and heading) and splitting in 3 steps (per-sowing, tillering and heading) as the sub-factor, and the amount of nitrogen fertilizer in three levels (150, 250 and 350 kg/ha Urea) as the sub-sub-factor. The results showed that with the increasing of density, the number of hills per m2, the number of spikes per m2 and the grain yield increased significantly. Moreover, along with the decreasing of sowing density, the number of spikes per hill, the number of spikelets per spike, the number of grains per spikelet, the number of grains per spike, the thousand grains weight and the yield of each hill decreased significantly. By applying the fertilizer in 2 splits, the numbers of spikes per hill and per m 2 increased significantly. With the increasing of nitrogen fertilizer use, the number of spikes per hill, the number of spikes per m2 and the number of grains per spike were increased significantly.