摘要
本研究应用点阵法,经修饰的Cate-Nelson方差法、Mitscherlich方程和对数方程拟合法综合分级,在土壤速效钾含量20～40ppm范围内,所取得的149组田间试验数据确定供钾水平等级,提出种植水稻、甘蔗、苎麻、西瓜和棉花等作物的土壤当季供钾(速效钾)指标。水稻为极低<40ppm,低40～70ppm,中70～90ppm,高>90ppm;甘蔗为极低<45ppm,低45～60ppm,中60～95ppm,高>95ppm;苎麻极低值为65ppm;西瓜极低值为60ppm;棉花极低值为45ppm。根据不同指标等级可对不同作物提出施钾计算式和最佳施钾量建议。
This paper deals with the comprehensive partitioning of soil potassium supply by means of graphical method, modified variance method of Cate-Nelson analysis, modified Mitscherlich equation and Logarithm equation for soil partitioning. Based on the 149 datum groups obtained from field trails, the soil available K of which was in the extent of 20-140 ppm, the partitioning value of soil available K supply indexes for the seasoning crop was pointed out. For rice growing: extra-low <40ppm, low: 40-70ppm, middle: 70-90ppm, and high>90ppm; for sugarcane: extra-low<45ppm, low: 45-60ppm, middle: 60-95ppm, and high > 95ppn. The extra-low critical levels of soil available K for ramie, watermelon, and cotton growing were 65ppm, 60ppm, and 45ppm, respectively. According to the above various indexes, a calculating formula for K application and the optimum fertilization of potassium could be given for specific crop.
出处
《江西农业学报》
CAS
1991年第1期36-42,共7页
Acta Agriculturae Jiangxi
关键词
土壤
钾
钾供应量
分级
最佳施钾量
Soil available potassium supply Comprehensive partitioning Critical level Optimum fertilization of potassium
