氮化肥的适宜施用量是春季迟插晚西瓜栽培技术上的重要环节之一。为此,我们于1987、1988年进行了春季迟播晚西瓜氮化肥适宜施用量试验。现将试验结果总结如下,供参考。一、试验方法试验设5个处理,即每亩氮化肥施用量折纯氮公斤数分别为13N、18N、23N、28N和33N。氮化肥的纯氮含量碳铵按17％计,尿素按46％计。各处理氮化肥的施用比例分别为,基肥占30％,当家肥占20％,座果肥占20％,膨瓜肥占30％。此外,各处理还配合施用一定数量的腐熟有机肥和磷肥(见表1)。试验地土壤样品化学测定结果见表2。供试品种为新澄F_1,4月15日播种,采用育苗后地膜栽培的形式。试验采用小区处理;随机排列,重复3次, Appropriate amount of nitrogen fertilizer is late spring watermelon late late one of the important aspects of cultivation techniques. To this end, we carried out in late spring and spring in late 1988 broadcast night watermelon nitrogen fertilizer appropriate application test. The test results are summarized below, for reference. First, the test method Test set up five treatments, that is, the amount of Nitrogen fertilizer per acre of pure nitrogen kilograms of nitrogen were 13N, 18N, 23N, 28N and 33N. Pure nitrogen content of nitrogen fertilizer ammonium bicarbonate by 17%, urea by 46%. The proportion of each treatment of nitrogen fertilizer, respectively, accounting for 30% of base fertilizer, when the home fertilizer accounted for 20%, Block fruit accounted for 20%, 30% bulked melon. In addition, each treatment also cooperates with a certain amount of decomposed organic fertilizer and phosphate fertilizer (see Table 1). The results of chemical determination of soil samples in the test are shown in Table 2. The test varieties for the new Cheng F_1, April 15 sowing, the use of plastic film in the form of nursery. The experiment uses plot processing; randomly arranges, repeats 3 times,