控氮增磷 种植西瓜应尽量少施氮肥,若施氮过多,合成的蛋白质也越多,消耗的糖分也就越多。因此,应多施有机肥和适当增施磷肥,每亩施土杂肥三百公斤、猪牛粪五百 Control of nitrogen phosphorus planting watermelon should be minimal nitrogen fertilizer, if too much nitrogen, the more protein synthesis, the more the sugar consumed. Therefore, more organic fertilizers should be applied and appropriate application of phosphate fertilizer, three hundred kilos of soil and fertilizer per acre, 500 pigs of pig manure