西瓜施肥“六忌”一忌单施大量氮肥：据试验，西瓜座瓜前，以氮为主，座瓜后对钾的吸收量剧增；瓜的退毛阶段吸收氮、钾量基本相等，瓜的膨大阶段吸收量达到高峰，瓜的成熟阶段氮、钾吸收量明显减少，磷的吸收量相对增加。氮、磷、钾三要素的比例，幼苗期应为３．８；１：... Watermelon fertilization, “six bogey,” a bogey a large amount of nitrogen fertilizer alone: ​​According to the test, watermelon seat melon before the main nitrogen, selenium after the absorption of potassium increased sharply; melon hair removal phase absorption of nitrogen and potassium are basically the same, In the stage of melon enlargement, the absorption peaked. The nitrogen and potassium absorption of melon decreased obviously at the mature stage of melon, and the absorption of phosphorus increased relatively. Nitrogen, phosphorus and potassium ratio of the three elements, the seedling stage should be 3.8; 1: ...