Effects of nitrogen applicaton level on system productivity, nitrogen absorption and accumulation in mung bean‖oat intercropping system

This study,the effects of nitrogen application rates on the productivity,nitrogen uptake and dry matter yield were investigated in mung bean‖oat intercropping system.Under the condition of different fertilizer amount(0,30,60,90 and 120 kg/hm2),naked oat Baiyan2 and the mung bean Bailv11 were used as the experiment materials.The results showed that,compared with sole cropping system,on average,intercropping significantly increased system productivity by 30%.The productivity,dry matter yield,and nitrogen uptake and utilization efficiency did not go up along with the increase of nitrogen application rate.Under high nitrogen fertilizer and intercropping,all nitrogen fixers have a character that they will loss ability of nitrogen fixation,called ammonia repress,indicating that over abundant nitrogen uptake exited.Without or with lower the supply of N fertilizer,intercrops of mung bean and oat showed higher productivity,LER,biological yield,nitrogen uptake and utilization efficiency,but without influencing the total intercrop grain yield.