抓好后期三招促进甘薯高产甘薯进入生育后期，一般即由原来的营养生长期转入块根膨大期，此时的田间管理，必须重点抓好以下几占．一、喷施叶面肥对早衰严重的地块，应以喷施氮肥为主，反之应做到氮、磷、钾合理搭配，用肥量可根据当时天气状况而定。一般久暗无雨时喷施数... Do a good job in the latter three strokes to promote high-yield sweet potato into the later stages of fertility, generally from the original vegetative growth into tuberous bulimia, field management at this time, we must focus on the following few. First, spraying foliar premature serous serious land should be sprayed with nitrogen-based, on the contrary should be done with nitrogen, phosphorus and potassium with a reasonable, with the amount of fertilizer according to the weather conditions may be. Generally long and dark when the spray number ...