Effects of nitrogen and phosphorus fertilizer on seed yield, seed yield components and canopy NDVI of Elymus sibiricus

A spilt-plot experiment was designed to study the effects of different rates of nitrogen and phosphorus fertilizers on seed yield,yield components and canopy NDVI in four year Elymus sibiricus seed crop field.Results indicated that seed yield reached the highest rate of 385.18 kg·hm-2 when phosphorus fertilizer application was 120 kg P·hm-2.The phosphorus fertilizer improved seed yield by affecting fertile tiller density,spikelets per inflorescence and thousand-seed weight.Nitrogen application didn’t affect seed yield significantly (P0.05).The nitrogen application and phosphorus application both effected canopy NDVI without significance (P0.05).The correlation between canopy NDVI and seed yield was significantly positive (P0.05) in the mature stage with different treatments .