据调查表明,当前瓜田土壤中氮、磷、钾含量比例失调问题较为突出,一般氮素较为丰富,磷素基本平衡,钾素呈亏缺状态。而人们施肥往往重氮、磷而忽视钾。试验证明,西瓜施氮过多(亩施尿素40—50公斤以上),其糖度会明显出现下降趋势。西瓜是需钾的作物。增施钾肥能提高果实含糖量。据试验,西瓜不施钾肥的,其中心糖度为7度;施钾肥的,中心糖度为9.3 According to the survey shows that the current melon soil nitrogen, phosphorus and potassium content imbalance is more prominent, generally rich in nitrogen, phosphorus is basically balanced, potassium was deficit. Fertilizers are often diazo, phosphorus and neglect of potassium. Experiments show that watermelon too much nitrogen (Mushi urea 40-50 kg or more), the sugar content will obviously decline. Watermelon is potassium crops. Potassium fertilizer increased fruit sugar content. According to the experiment, watermelon does not apply potassium fertilizer, its center sugar degree is 7 degrees; The potassium fertilizer, the center sugar degree is 9.3