黄土高原旱地果园土壤水分管理研究

在黄土高原中、南部的延安宝塔区和淳化县，测定了旱地果园土壤储水量，测定结果表明:在苹果生育期，以60%田间持水量作为水分亏缺的标准，不同月份土壤储水量变幅很大，均出现不同程度的亏缺，需要补水才能满足苹果的正常生长要求。进行苹果需水规律试验和品质测定表明，在该地区优质苹果生产需水量为600mm左右。通过有限灌水技术试验证实，穴灌的净增值率高达58.7%。

Study on Water Management in Dry Orchard in Loess Plateau

Soil moisture was measured on the orchard in the Baota area of Yanan and Chunhua county in the southern and middle of Loess Plateau. If 60 percent of soil water reservation quantity was regarded as criterion of water-shortage, the result indicated that soil moisture changed largely and appeared shortage on various degrees in growing period of apple trees. If only apple trees were irrigated, they could grow normally. The experiment of the law of water requirement and measurement of quality of apple had indicated that the water requirement was about 600 mm in growing period in those areas. The experiment of limited irrigation indicated that the increase in value of den irrigation reached up to 58.7%.