摘要
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 the present paper, we studied the potassium supplying capacity of the main soil types and optimum application rates of potassium of economic crops by using field test in the Hexi inland irrigation of Gansu Province. The results showed that there were negative correlation between the potassium profits and the capacity of supplying potassium of the main soil types, i.e. the smaller the capacity of supplying potassium of the soil, the bigger potassium profits. The capacity of supplying potassium of the main soil types was arranged in a descendant order as the following: cultivated chestnut soil, salted alluvial soil, cultivated gray brown desert soil, cultivated gray desert soil and the irrigated desert soil. However, the potassium profits of the different crops were arranged in a descendant order as the following: watermelon, potato, cotton, sugar beet and rape. According to regression statistical analysis, the optimum application rates of potassium for economic benefits of watermelon, cotton, sugar beet, rape, potato were 462.00, 298.95, 355.51, 113.36 and 239.70 kg per hm2, respectively. Over the above optimum application rates, the decreasing returns occurred.
出处
《土壤通报》
CAS
CSCD
北大核心
2014年第2期402-406,共5页
Chinese Journal of Soil Science
基金
科技部国家十二五支撑计划项目"玉米
棉花
油菜新品种规模化制种基地建设"2011BAD35B10)
甘肃省高校河西走廊特色资源利用省级重点实验室项目(XZ1002)
甘肃省高等学校2010年研究生导师科研项目(1009B-05)资助
关键词
河西内陆灌区
供钾能力
最佳施用量
Hexi inland irrigation Areas
Capacity of supplying potassium
Optimum application rate
