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为了进一步探讨土类供钾能力与钾素施用量之间的关系,采用田间试验方法,研究了甘肃河西内陆灌区主要土类供钾能力和经济作物钾素最佳施用量。结果表明,施钾利润与土壤供钾能力呈负相关,供钾能力小的土壤,施钾利润大。不同土壤类型供钾能力由大到小的变化顺序是:耕种栗钙土>盐化潮土>耕种灰棕漠土>耕种灰漠土>灌漠土,而不同作物施钾利润由大到小的变化顺序是:西瓜>马铃薯>棉花>甜菜>油菜。经回归统计分析,西瓜、棉花、甜菜、油菜、马铃薯K2O在462.00、298.95、355.51、113.36、239.70 kg hm-2时的基础上,再继续增加钾肥施用量,施肥利润将出现报酬递减。
In order to further explore the relationship between soil potassium supply capacity and K application rate, field experiments were conducted to study the potassium supply capacity of main soils and the best potassium application rate of cash crop in inland irrigation area of Hexi Gansu. The results showed that there was a negative correlation between the potassium fertilization and the soil potassium supply capacity. The soil with small potassium supply capacity and the potassium fertilizer profit were large. The sequence of potassium supply of different soil types from big to small was as follows: chestnut soil> salinized soil> gray brown desert soil> gray desert soil> irrigated desert soil, The order of change is: watermelon> potato> cotton> beet> rape. According to regression analysis, on the basis of 462.00,298.95,355.51,113.36,239.70 kg hm-2 watermelon, cotton, sugar beet, rape and potato K2O, the application of potassium fertilizer will continue to increase, and the return on fertilization will decrease.