A suitable combined programme for fertilizer applications were N: 75130 kg/hm2,P2O5:50.0-112.5 kg/hm2 from tillering to the first ten days of July,with no or little potassium fertilizer.

• 确定“黑土型”退化草地上人工植被的施肥组合方案为施肥时间在分蘖~7月上旬、N:75~130 kg/hm2、P2O5:50.；0~112