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宁夏自治区苹果在开花前后经常遭受到辐射霜冻或平流霜冻的严重灾害,轻时减产二、三成,重时减产五成以上,已成为影响宁夏苹果稳产、高产的主要因素。1971年以来,宁夏一些国营果园主要采用放烟法预防霜冻,但实际收效甚微或根本无效。1978年开始利用喷灌进行苹果花期防霜冻试验,经过两年的试验观察,取得较好效果。一、试验的基本情况试验设置在灵武园艺试验场二队果园中,土壤为沙质土,地下水位2米左右。主栽品种为20年生小国光苹果,行株距7×4米,株间树冠相互交错,树冠高4～5米左
Ningxia Autonomous Region before and after the apple blossoms often suffer from radiation frost or stratosphere frost serious disastrous light reduction 20%, 30%, when the weight reduction of more than 50%, has become a Ningxia apple stable yield, the main factor. Since 1971, some state-run orchards in Ningxia have mainly used the smoke-letting method to prevent frosts, but the actual results have little or no effect. Spray irrigation began in 1978, the flowering of apple frost resistance test, after two years of experimental observation, and achieved good results. First, the basic situation of the test The experiment set in the second team orchard in Lingwu horticultural test ground, the soil is sandy soil, groundwater level of about 2 meters. The main cultivars are 20-year-old Guoguang apple, row spacing of 7 × 4 meters, canopy interwoven between trees, the crown of 4 to 5 meters high