甘薯生长从茎叶封垄到茎叶生长达到高峰,薯块也相应增粗膨大,已进入以茎叶生长为中心的薯块膨大期,到8月中下旬茎叶生长达到高峰。此时正值高温多雨季节,肥料分解快,水分供应充足,容易发生徒长现象,上层叶片乌黑,叶节叶柄较长,叶层厚,叶片相互遮荫通风透光差,下层黄叶、落叶、死茎烂叶多,薯块膨大慢,容易造成秧大薯小而减产。因此抓好以下五项措施可提高甘薯产量。1、注意及时排涝。由于高温多雨, The growth of sweet potato stems and leaves from the stem to the peak growth of stems and leaves, tubers also corresponding thickening and enlargement, stems and leaves have entered the center of the expansion of tubers, stem and leaf growth in mid to late August reached its peak. At this time when the hot and rainy season, fast decomposition of fertilizers, adequate supply of water, prone to leggy phenomenon, the upper leaves black, leaf petiole longer, thick leaves, shade shade each other poor ventilation, the lower yellow leaves, deciduous, Stem rotten leaves more, tuber swelling slow, easy to cause small and reduced transplanting seedlings. So do a good job in the following five measures to increase sweet potato production. 1, pay attention to timely drainage. Due to hot and rainy,