The production of crops in agroforestry decreased seriously because of lacking of soil water and illumination and so on, production of wheat and corn in 3 years agroforestry system decreased by 35%.
土壤水亏缺及杨树遮荫等其它原因造成复合系统农作物减产趋于严重，其中林龄3年的杨农复合系统的小麦玉米产量减产平均达到35%。
The effect of applying N-fertilizer or not in wheat on soil fertility and grain yield and fertilizer-N use efficiency (FNUE) of rice in the wheat-rice cropping system were studied.
通过对前茬作物小麦设置施用氮肥与不施用氮肥处理研究它对土壤肥力及后茬作物水稻产量和氮肥利用率的影响。
The effects of root system of corn, bean and wheat on the fractionation of copper, lead, cadmium and zinc in rhizosphere in farmland soil irrigated with wastewater were studied.
采用根垫法研究了玉米、大豆和小麦根际环境对污灌土壤中铜、镉、铅、锌形态的影响。
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