Effects of nitrogen applications on seed yield of Cleistengenes songorica

The present experiments were conducted to study the effects of different nitrogen application rate and periods on seed yield and yield components of Cleistengenes songorica in 2013. Seed yields of C.songorica significantly increased (P0.05) with the increasing nitrogen application rate which maximized at 100 kg N·hm-2 application rate with 1 696.8 kg·hm-2. Meanwhile,fertile tillers per unit area and seeds per spikelet were significantly influenced by nitrogen application rate which also maximized at 100 kg N·hm-2 application rate with 3 075.77·m-2 and 40.53·spikelet-1, respectively. The number of fertile tillers per unit area was the most important component for seed yield.