Through the review of the research on hedgerow cropping by international and domestic institutions,it is sure that a new protection technology on sloping farmland primarily formed for extension.Alley cropping technology can effectively control soil and water erosion,increase crop yield and economic income,improve development of animal husbandry,save fund and reduce fertility degradation under the terracing periods.But in extension stage it faces the problem of difficult selection of suitable hedgerow crops ...
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