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试验在五杖子、挂兰峪两地进行。试材为30年生栗树,在雌花出现期(6月23日)和栗棚膨大期(7月20日)用0.3％、0.5％的磷酸二氢钾和0.3％磷酸二氢钾+0.3％尿素(日本产)三个浓度进行叶面喷肥,分别处理20株,对照喷清水19株。试验结果看出:喷0.3％磷酸二氢钾+0.3％尿素单粒重8.24克,0.3％磷酸二氢钾单粒重7.28克,0.5％磷酸二氢钾单粒重7.99克,与喷清水单粒重6.39克相比,产量分别提高29％、13.9％和25％。通过显著性测试,均有提高产量的作用,但以0.3％磷酸二氢钾+0.3％尿素效果最好,其次是0.6％磷酸二氢钾。从而说明在栗树雌花出现期和栗棚膨大期喷布0.3磷酸二氢钾+0.3％尿素或单喷0.4％磷酸二氢钾可以显著地提高栗树产量。
Experiment in Wuzhangzi, hanging Lan Yu two places. The test material was 30-year-old chestnut tree, with 0.3%, 0.5% potassium dihydrogen phosphate and 0.3% potassium dihydrogen phosphate + 0.3% urea in the appearance period of female flower (June 23) (Japan) three concentrations of foliar fertilizer were treated 20, 19 control spray water. The results showed that spraying 0.2% potassium dihydrogen phosphate + 0.3% urea single weight 8.24 g, 0.3% monobasic potassium dihydrogen phosphate 7.28 g, 0.5% monobasic potassium dihydrogen phosphate 7.99 g, Compared with 6.39 g of grain weight, yields increased 29%, 13.9% and 25% respectively. Through the significance test, all have the effect of increasing the yield, but 0.3% of potassium dihydrogen phosphate + 0.3% urea is the best, followed by 0.6% of potassium dihydrogen phosphate. The results showed that the yield of chestnut trees could be significantly increased by spraying 0.3% monobasic potassium phosphate + 0.3% urea or 0.4% monopotassium phosphate monophate in the emergence period of chestnut female flowers and chestnut bulking stage.