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甘薯适应性广,抗逆性强,是高产稳产的重要粮食作物之一。甘薯一生对氮、磷、钾三要素的需求因不同时期而异。氮肥以茎叶生长时期吸收较多,块根膨大时期吸收较少;磷肥在茎叶生长中期吸收较少,块根膨大时期吸收较多;而钾肥的吸收从栽插到收获都比氮、磷多,以块根膨大时期更为显著。因此,甘薯高产施肥必须围绕这一特点进行,做到基肥要注重一个“足”字,追肥要落实一个“巧”字。
Sweet potato has wide adaptability, strong resistance and is one of the important grain crops with high and stable yield. The demand for three elements of nitrogen, phosphorus and potassium in sweet potato varies from one period to the next. Nitrogen fertilizer absorbed more in the stem and leaf growth period and absorbed less in the tuberous enlargement period. Phosphate fertilizer absorbed less in the mid-stem and leaf growth stage and absorbed more in the tuberous root enlargement period. However, To tuber enlargement period more pronounced. Therefore, high yield fertilization of sweet potato must focus on this feature, so that basic fertilizer should pay attention to a “foot ” word, top dressing to implement a “clever ” character.