| Analysis was made of 30 years meteorological data of Xianyang Weibei dryland areas and other quality apple producing regions over the world.The results showed that,Xianyang Weibei plateau region is superior to other apple producing areas at home and abroad in ecological climatic conditions,such as appropriate temperature conditions,big diurnal range,rich solar energy resources and moderate water conditions,all of which provide favorable conditions for pollution-free green fruit production.The adverse climatic factors affecting apple yield and quality are mainly drought,wind,frost,hail,extra rain and other weather disasters.To make rational utilization of local climate resources and develop apple production of Xianyang Weibei plateau,certain countermeasures should be taken,such as adjusting structure of apple varieties,appropriately increasing early-ripening varieties,with a 10∶20∶70 ratio of early-,mid-and late-maturing varieties;optimizing regional distribution of fine varieties.In southern part,with an elevation of 600～850 m,late-maturing varieties should be suitably retained,mid-maturing varieties be developed in a moderate way and the proportion of early-maturing varieties be increased,and a certain proportion of varieties for both fresh consumption and processing should also be taken into account.In northern part,with an elevation of 850～1 300 m,superiority should be given to late-maturing varieties,and then mid-maturing onew,while a small amount of early-maturing varieties can be grown.In the less suitable areas,with an elevation of less than 600 m,early-and mid-maturing varieties for both fresh-consumption and processing should be grown as the main,while the latematuring varieties can be phased out.Great efforts should be made to implement the "four key techniques" to increase gifted fruit rate,and to enhance its competitive ability in the domestic and international market.Fruit storage and processing capacity should also be improved to increase the added value of fruit production.Finally,information system should be established and improved to guide consumers' market and to expand the share of Xianyang fruit in domestic and international market. |