我区4月下旬至5月上旬正值苹果盛花期,常遭晚霜冻害,损失很大,个别年份造成大幅度减产.如银川市园林场1976年苹果产量仅28万斤,比1975年(110万斤)减产74.6%.近年来我区一些苹果园采用花期灌溉减轻晚霜冻害,收到良好效果.为此,1979年我们在银川市园林场进行试验,为苹果园采用灌溉防霜提供了依据. My district from late April to early May coincided with the flowering of apple, often night frost damage, a great loss, resulting in significant annual reduction in individual production.If Yinchuan City garden in 1976, only 280,000 kg of apple production than in 1975 (110 Kg) cut 74.6% .In recent years, some apple orchards in our region to reduce the night frost damage by flowering irrigation, and received good results .To this end, we conducted experiments in Yinchuan City garden in 1979, for the apple orchard irrigation defrosting provided the basis .