Advanced in Continuous Cropping Obstacles of Alfalfa
Crop continuous cropping obstacles will result in soil nutrient deficiency,water content reduction,accumulation of self-toxicity substances,reduction of soil beneficial microorganisms,and aggra-vation of diseases and pests,which seriously affect crop yield.Alfalfa,as a perennial high-quality forage,is widely planted in our country.However,long-term continuous cropping of alfalfa may cause continuous cropping obstacles such as decreasing soil quality,increasing proportion of harmful microorganism,out-breaks of diseases and pests,and self-toxicity effects.This article collected and sorted out relevant litera-ture,put forward the problem of continuous cropping obstacle of alfalfa and analyzed its formation reason.By referring to other crops,it proposed measures that could be applied in artificial grassland of alfalfa,such as crop rotation,intercropping,rational fertilization and plant growth regulators.It pointed out that using functional microorganisms to change soil microecological environment is an effective way to prevent and control continuous cropping obstacles of alfalfa,and provided the basis for later research on solving continu-ous cropping obstacles of alfalfa.
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