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近几年来,我县大面积推广在甘薯生长后期根外追肥措施,收到了良好增产效果。据调查,根外追肥可防止早衰,延长叶龄,收获时每亩绿叶数比不追的增加19.4%,黄落叶减少22%,叶面积系数增加0.36;能加快薯块膨大速度,喷肥区每亩日增长量比不喷的平均增加12.5斤;还能提高大、中薯率7%。进行根外追肥时要依据甘薯叶色选用肥料种类。对叶片黄化过早、叶面积下降过快、提前早衰的地块喷施1%尿素液;对叶脉严重缺绿,
In recent years, a large area of my county to promote fertilizer in the sweet potato late top dressing measures, received a good yield. According to the survey, top-dressing can prevent premature aging and prolong the leaf age. When harvesting, the number of green leaves per harvest is increased by 19.4% compared with no-harvest, the deciduous yellow leaves is reduced by 22% and the leaf area coefficient is increased by 0.36. The growth rate per mu than the average increase of not sprayed 12.5 pounds; but also improve the large, sweet potato rate of 7%. For root top dressing should be based on sweet potato leaf color selection of fertilizer types. On the premature etiolation of leaves, leaf area decreased too fast, early premature aging plot spraying 1% urea solution; a serious lack of green veins,