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近几年我省西瓜栽培面积迅速扩大,1986年达166.31万亩,居全国首位。但部分地区为了追求产量,偏施氮肥,致使氮磷钾比例失调,西瓜品质下降,化肥利用率低,经济效益低。为了探讨氮肥的增产效应,确定氮肥的经济最佳施用量,去年我们进行了西瓜施用氮肥的增产效应试验。现报导如下,供参考。该试验设置在汝南县水屯乡新坡大队,土壤为黄壤土,质地为中壤土,0—20厘米,有机质含量1.16％,水解氮81.57ppm,速效磷27.91ppm,速效钾135ppm。试验设7个处理,分别为①空白(无肥
In recent years, the area of watermelon cultivation in our province has rapidly expanded to 1.6631 million mu in 1986, ranking first in the country. However, in some areas, in order to pursue output, partial application of nitrogen fertilizer resulted in imbalances of nitrogen, phosphorus and potassium, decreased watermelon quality, low utilization of chemical fertilizers and low economic benefits. In order to explore the yield-increasing effect of nitrogen fertilizer and determine the economic optimum dosage of nitrogen fertilizer, last year we conducted the experiment of increasing yield of watermelon applying nitrogen fertilizer. Now reported as follows for reference. The trial was set up in Xintang Brigade, Shuntun Township, Runan County. The soil was yellow loam. The texture was medium loam. The soil was 0-20 cm with organic matter content 1.16%, hydrolyzed nitrogen 81.57ppm, available phosphorus 27.91ppm and available potassium 135ppm. The experiment set seven treatments, respectively ① blank (no fertilizer