水砂田地膜西瓜钾肥施用效果试验研究初报

A Study of Potassium Fertilization on Plastic Mulched Watermelon in Irrigated Sand Land

在白银市灌区水砂田进行的施用钾肥对西瓜生长发育、主要性状及产量影响的试验结果表明 ,在一定氮磷肥基础上 ,施钾肥量与西瓜产量呈正相关 ,但以施 K2 O15 0 .0 kg/hm2较为经济适宜 ,较不施钾肥对照增产8.5 7% ,增加产值 2 0 0 0 .1元 /hm2 ,产投比达 6 .6 7;单施钾肥对西瓜仍有一定增产效果 ,尤以膨瓜期追施效果最佳 ,产量达到 5 2 5 0 0 .0 kg/hm2 ,较对照增产 6 .11% ,产投比为 5 .37;施用钾肥不仅能使西瓜的瓜蔓、茎、叶等植株各部分生长更强健 ,增强其抗病、抗逆性 ,还可明显增加单瓜重 。

Experiments of potassium fertilization on plastic mulched watermelon were conducted to determine the effects of fertilizer on growth and development and main economic traits and yield. Results showed that watermelon yield did correlate with amounts of potassium based on certain amounts of nitrogen and phosphorus. Compared to no potassium treatment, the yield and economic values of application K_2O 150.0 kg/hm^2 increased by (8.57%) and (2000.1) yuan/hm^2, and ratio of output to input was 6.67. Watermelon yield still increased when potassium only was applied, but a high yield of 52 500.0 kg/hm^2 that increased by 6.11% over unfertilized treatment was realized when potassium was drilled at stage of melon swelling. Potassium not only makes vine and stem and leaf grow well, but also virus and stress resistance strengthen, resulting in melon yield increase and qualities improvement.