砂薄地冬小麦-夏玉米轮作施钾效应

在大田条件下研究了砂质潮土冬小麦-夏玉米轮作施钾效应,田间试验结果表明:砂质潮土地冬小麦产量随施钾量的增加而增加,以施钾量150kg/hm2(基肥:追肥=5:5)的经济效益最佳,增产822.7kg/hm2,每公顷增收724.1元,产投比为2.42;玉米生产也以施钾量150kg/hm2分次施用为最佳,增产1368.4kg/hm2,每公顷增收1281.7元,产投比为2.52。冬小麦-夏玉米轮作体系中,施钾量为150kg/hm2时,两季连续分次施用钾肥经济效益最佳,施钾量为300kg/hm2时,小麦分次施用钾肥而玉米不施钾肥的经济效益最好。

Effects of Potassium Fertilizer in Winter Wheat -Summer Maize Rotated in Sandy Soil

In this paper, the effect of potassium fertilizer was studied about winter wheat and summer maize rotated in sandy Chao soil field. The results showed that with increasing of the applied of potassium fertilizer, the yield of winter wheat became higher. The efficiency is the best when the amount of applying potassium fertilizer is 150kg/hm2 and the ratio of basic to dressing is 5: 5. It can increase the yield 822.7 kg/hm2, or increase the money 724.1 yuan/hm2, the ratio of import to export is 2.42. In the maize yield, the optimal rate of potassium fertilizer is 150kg/hm2 and the optional ratio of basic to dressing is 5:5 at which the highest ratio of import to export is 2.52, and it can improve the yield 1368.4kg/hm2, or the money 1281.7 yuan/hm2. In the system of winter wheat and summer maize rotation, when the optimal rate of potassium fertilizer is 150kg/hm2 and the optional ratio of basic to dressing is 5:5, the potassium fertilizer should be applied respectively in wheat and maize. When the optimal rate of potassium fertilizer is 3000kg/hm2 and the optional ratio of basic to dressing is 5:5, the potassium fertilizer should just be applied respectively in wheat.