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处暑前后,红薯块根开始进入膨大高峰期,故此时随着薯块的迅速增大,田间开始出现裂缝。红薯裂缝期标志地上部分生长优势已经结束,进入以地下部生长(红薯)为主阶段。可是随着薯块的膨大,裂缝的增加,地上部蔓叶生长势逐渐衰落,叶色变淡转黄。红薯蔓叶的这一褪色现象,表明土壤肥力也开始不能满足薯块膨大的需要。因此,应抓住这一有利时机,增施裂缝肥。给红薯增施裂缝肥,不仅可以充分提高叶片的生理功能,促进薯块的增大,而且能明显提高红薯品质和产量。怎样追施裂缝肥呢?主要应做到“三巧”: 1.选肥巧。选肥巧要巧在一个
Before and after summer heat, sweet potato roots began to inflate the peak, so with the rapid increase of tubers, the field began to crack. Sweet potato crack marks the growth of the aboveground part of the advantage has ended, into the underground growth (sweet potato) -based stage. However, with the enlargement of tubers, the increase of cracks, the growth potential of creeping leaves on the ground gradually declined and the color of leaves turned pale. The discoloring phenomenon of sweet potato leaves shows that soil fertility can not start to meet the needs of potato enlargement. Therefore, we should seize this favorable opportunity to increase cracks in fertilizer. Applying split fertilizer to sweet potato not only can fully improve the physiological function of leaves and promote the increase of potato tuber, but also can obviously improve the quality and yield of sweet potato. How topdressing crack it? The main should be done “Three Qiao ”: 1. Choose fertilizer clever. Choose fat clever to be clever in one