我省红苕主要分布在土壤瘠薄的坡地上。土壤氮素含量低,速效磷严重缺乏,速效钾也不能满足红苕生长需要,后期大都表现出叶片落黄早衰,或老叶叶脉间失绿,出现大批黄斑、变紫,并逐渐脱落等缺钾、缺磷症状,产量一直不高。前几年通过改换良种、推广壮藤早栽和增施肥料等技术,产量有了明显增加,但后期缺肥问题仍然存在。为了进一步挖掘红苕增产 Red crab in our province is mainly distributed in the barren soil slope. Soil nitrogen content is low, a serious lack of available phosphorus, available potassium can not meet the needs of the growth of red yeast rice, most of the late showed yellow leaves premature aging, or old leaf veins green, a large number of macular, purple, and gradually fall off and other potassium , Phosphorus deficiency symptoms, the yield has not been high. A few years ago by changing the elite, promoting early planting and fertilizing techniques such as stalks, the yield has been significantly increased, but the late lack of fertilizer problems still exist. In order to further tap the red snapper production