HAZARD FACTOR ANALYSIS OF SANDY LAND ORCHARD IN SEMI HUMID AREAS
半湿润地区沙地果园灾害因子分析

Various natural hazard factors such as drought and flooding,high temperature and sun burning,wind,fertilization inadequancy,disease and inset pests as well as weeds all affect horticultural production to differing degrees.The paper discusses the characteristics of genesis of these factors and their hazardous impact on fruit trees,analyses law of their harmfulness,and raises suggestions concerning the adoption of corresponding technmical measures for the improvement of orchard management level,production of high-yield and high quality fruits,and providing theoretical guidence.