沙漠边缘地区果园幼树越冬技术措施的研究

STUDIES ON THE CULTIVATED MEASURES FOR SAFELY OVERWOMTERROMG OF YOUNG FRUIT TREES IN DESERT MARGIN REGIONS

调控２年生苹果树灌水次数、时期和土壤管理试验，使７月下旬１００ｃｍ上层含水量为土壤田间持水量的５０％左右，促进幼树根系向下生长、新梢适时停止生长、提早进入休眠准备；１０月上旬冬灌，下旬耕翻土壤、提高地温和降低冻土厚度，下旬耕翻土壤、提高地温和降低冻土厚度，使苹果幼树正常越冬率由对照的５２．４％提高到９７．１％，差异极显著。

The soil moisture in late July was set at about 50%of field capacity through adjustingand manipulating tests of diffcrent periods and times of watering and soil managements for two-year-old apple trees in desert margin region , so as to promote root the gronth dowmward and passingproperly growth of shoots, and let the plants get early dormant preparation. The soil temperatureincreased and thickness of freezed layer decreased through winter watering in early October and soilplough in late October. Therefore the persentage of plants overwintering normally increased from only52.4%for CK to 97.1%for treatment and the difference between treatment and CK is verysignificant.