西瓜长的个大为啥不甜西瓜长的个大着人喜爱，吃却无味不甜。主要原因是：偏施氮肥过多，缺少钾肥，影响西瓜品质。西瓜偏施氮肥，为什么长的个大而无味？氮是蛋白质的主要成分，蛋白质是组成原生质的基本物质，是生命活动的基础，氮义是叶绿素和多种酶的成分，叶绿素又是... Watermelon long a big why not sweet watermelon long big favorite, eat but tasteless sweet. The main reason is: Partial nitrogen fertilizer too much, the lack of potassium, affecting watermelon quality. Partial application of watermelon nitrogen fertilizer, why a long big tasteless? Nitrogen is the main component of protein, protein is the basic material of the formation of protoplasm, is the basis of life activity, nitrogen is the composition of chlorophyll and a variety of enzymes, chlorophyll is ...