80年代以来,我省根据外地经验在全省范围内大面积推广应用了小麦叶面喷施磷酸二氢钾的根外追肥技术。在推广这一措施的同时,各地区还进行了一些田间试验,用以估计磷酸二氢钾喷施的增产效果。但从试验结果来看,喷施效应很不一致,结论分歧很大。为了在这方面获得更多的信息,明确小麦叶面喷施磷酸二氢钾有无增产效果、效果的大小、有效条件以及增减产的原因等,从而对它的应用价值作出比较客观的评价,1988～1990年由甘肃省农科院科管处下达,土肥所主持,有关地州农科所参加,分别在张掖、武威、兰州、临夏和平凉等地进行了田间试验。除定西和平凉为早地外,其余均有灌溉条件,现将主要结果报告如下。 Since the 1980s, our province based on field experience in large areas across the province to promote the use of wheat leaf spraying potassium dihydrogen phosphate root top dressing technology. In parallel with the promotion of this measure, field trials have also been carried out in various regions to estimate the stimulation effect of potassium dihydrogen phosphate spraying. However, from the test results, the spraying effect is very inconsistent, the conclusion is very different. In order to obtain more information on this aspect, it is clarified whether the potassium dihydrogen phosphate has the effect of increasing yield, the effect size, the effective conditions and the reason of the increase or decrease of the output of wheat foliar fertilizer, so as to make a more objective evaluation on its application value From 1988 to 1990, Gansu Academy of Agricultural Sciences Division issued by the Office of Soil and Fertilizer, presided over by the State Agricultural Science Institute participated in Zhangye, Wuwei, Lanzhou, Linxia and Pingliang and other places conducted field trials. In addition to Dingxi and Pingliang for the early days, the rest have irrigation conditions, the main results are reported as follows.