宁夏地处西北,每年冻土期约5个月,早春气温回升快,大风频繁,梨幼树越冬“抽条”严重,历年果农延用单株埋土越冬,不仅用土量大,费时、费工,主干折断、劈裂甚多,加之田间到处是坑凹、土堆,给早在间作播种带来诸多不便。针对这种情况,我们从抑制枝条皮孔水分散失入手,于1988～1990 Ningxia is located in the northwest, with a permafrost period of about 5 months per year. The temperature in early spring rebounded rapidly and the gale was frequent. The over-wintering “sapling” of young saplings of pears was serious. Workers, trunk broken, splitting much, coupled with the pit is everywhere in the field, mound, to early in the intercropping to bring a lot of inconvenience. In view of this situation, we start from inhibiting the water loss of branches and lenticels, from 1988 to 1990