北方果产区果园大部分无灌溉条件,春季3-5月是果树需水最敏感时期。当此间降水量不足历年一半或果园田间持水量低于50%持续1个月以上就会出现旱情。因为,这时多数果树处于旺长期,采取春灌和保墒耕作技术防御春旱是增产的关键。当果园土壤田间持水量小于60%时春灌1～3次可增产10%～30%。 Most of the orchards in northern fruit producing areas have no irrigation conditions. Spring March-May is the most sensitive period for fruit trees to water. When the rainfall here less than half the calendar year orchard field water capacity of less than 50% for more than 1 month drought will occur. Because, at this time most of the fruit trees in the long-term, spring irrigation and moisture conservation farming techniques to prevent spring drought is the key to yield. When the field orchard soil water capacity of less than 60% of spring irrigation 1 to 3 times 10% to 30% increase.