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苹果栽培已成为陇东塬区农业经济的支柱产业之一 ,而苹果生育期有效降水量为 2 44～ 5 1 8m m,且分布不均 ,年蒸发量为 1 5 2 7m m,因此水是限制该区果业发展的最主要因素。试验根据苹果枝条、果实生长速率的生物学指标和降水特点 ,确定陇东塬区苹果园滴灌最佳灌水期为萌芽前 (3月末 )、新梢旺长前 (5月初 )、果实迅速膨大期 (7～ 8月 )和封冻前 (1 0月末至 1 1月初 )
Apple cultivation has become one of the pillar industries in the agricultural economy in eastern Gansu Province. However, the effective precipitation during the growth period of apple is between 2 44 m and 5 18 m, and the distribution is uneven. The annual evaporation is 1 5 2 7 m m. Therefore, water is The most important factor limiting the development of fruit industry in this area. According to the biological indexes of apple shoots and fruit growth rate and the characteristics of precipitation, the best irrigation period of apple orchard in east Gansu Province was determined before budding (at the end of March) and before the shoot growing at the beginning of May (early May) (July to August) and frozen before (late January to early January)