论文部分内容阅读
地瓜生长前期以地上部生长为主,需氮素营养较多,可为早分枝、早结薯、结大薯打下基础。在生长中后期,尤其在块根膨大期对钾素需要特别突出。钾肥充足,植株茎叶绿,生长强壮,块根大,纤维少,糖分和淀粉含量增加,产量也高。根据地瓜生育中后期对钾素要求敏感的特点,我们于1983年分别在朝阳县六家子、黑营子、黄土坎子三个乡做了地瓜生长后期根外追肥试验,取得了很好效果。 我们用以试验的磷酸二氢钾含量为99.5％,喷施浓度为0.3％,即每亩地用钾肥0.3斤,对水100斤左右,分别于8月8日和8月18口两天的下午5点,用喷雾器喷洒地瓜叶面,以喷清水为对照。试验地和对照田地力一致,栽培管理措施相同。
Sweet potato growth early to shoot growth, nitrogen nutrition required for early branching, early tuber, knot big potato lay the foundation. In the late growth, especially in tuberous expansion of potassium needs particularly prominent. Potassium sufficient, plant stems and leaves green, strong growth, large roots, less fiber, sugar and starch content increased, the yield is also high. According to the characteristics of sweet potato demanded to be sensitive to the requirement of potassium in the middle and late growth period, we made the root top dressing experiment in the later period of sweet potatoes growth in 1983 in the six townships of Chaoyang County, Heiyingzi, and Huangkuankan, and achieved good results . We used to test the potassium dihydrogen phosphate content of 99.5%, spraying concentration of 0.3%, that is, with 0.3 kg of potassium per mu of land, about 100 pounds of water, respectively, on August 8 and August 18 for two days 17 o’clock in the afternoon, with a spray sprayer sweet potato leaves to spray water as a control. The test site and the control field have the same soil fertility and the same cultivation and management measures.