半湿润地区沙地果园灾害因子分析

旱涝、高温日灼、凤、肥力匮乏、病虫害、草害等各种自然灾害因子，不同程度地影响着果园生产。本文阐述了这些因子的发生特点及对果树的危害，分析了其危害规律，为提高果园管理水平，生产出高产优质果品，应采取的相应的技术措施，提供了理论指导。.3

HAZARD FACTOR ANALYSIS OF SANDY LAND ORCHARD IN SEMI HUMID AREAS

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.