氮肥用量对油菜//蚕豆间作系统作物产量及养分吸收的影响

油菜间作蚕豆方式中的养分吸收利用特征少见报道,本研究通过田间小区试验探讨了不同施氮水平下间作对作物产量及氮、钾养分吸收利用的影响。通过研究表明,油菜间作蚕豆具有显著的间作产量优势,间作方式中油菜的竞争能力强于蚕豆。间作平均提高油菜产量15.6%～44.5%,提高蚕豆产量12.1%～26%。不同施氮条件下,间作土地当量比（LER）=1.14～1.67,N112.5条件下LER最大,N225条件下,作物产量最高。间作提高了油菜地上部氮吸收量,其中间作第一行间作第三行单作,在农民习惯施肥水平（N337.5）条件下间作养分吸收优势消失。随着氮肥施用量的增加,单、间作油菜氮吸收量随之增加。间作油菜子粒氮吸收量、钾吸收量在推荐施氮（N225）条件下达到最大值。不同施氮条件下,单、间作油菜地上部钾吸收量没有差异。间作促进氮素营养由营养器官向生殖器官转移,但对钾素营养的分配没有影响。

Effects of N fertilization on yield and nutrient absorption in rape and faba bean intercropping system

Few studies of nutrient absorption and utilization were conducted in rape and faba bean intercropping system.A field experiment of rape and faba bean intercropping was carried out to study the effects of the intercropping on crops' yields and N,K absorptions and utilizations under different N application levels.The results show that there is a remarkable intercropping yield advantage in the rape and faba bean intercropping system,and the increased rape yield(15.6%-44.5%) is higher than that(12.1%-26%) of fa...