重庆甘薯土壤养分分级研究

Study on Classification of Soil Nutrient Status of Sweet Potato in Chongqing

对重庆市江津区59个甘薯土壤样本进行了测试分析。结果表明,甘薯土壤整体偏酸,仅有不足1/4的土壤适宜甘薯生长;有机质含量偏低,有机质<20 g/kg的土样占83.1%;近2/3的土壤全氮、钾适合甘薯生长,分别占69.5%和77.9%,而全磷<0.6 g/kg的土壤占66.1%;有效N、P、K属缺乏范围的分别为45.7%、37.3%、66.1%;土壤中量元素交换性钙、镁适量和丰富分别是11.9%和66.1%、27.1%和35.6%;微量元素有效铜、锌、铁、锰含量不存在缺乏现象(有效硼除外)。

In this paper,the samples collected from 59 sweet potato growing areas of Jiangjin district in Chongqing were detected and analyzed.The results showed that the overall soil of sweet potato tended to be acid,of which 1/4 was suitable for the growing of sweet potato.The soil was relatively low at levels of organic matter,in which the content of organic matter under 20 g/kg accounted for 83.1 %.The contents of total nitrogen and total potassium which were suitable for sweet potatoes were 69.5 % and 77.9 %,respectively,and took up 2/3 of the whole samples. While the content of total phosphorus under 0.6 g/kg was about 66.1 % of soils in the range of lack of phosphorus. The content of available nitrogen,available potassium and available phosphorus in the range of deficiency were 45.7 %,37.3 % and 66.1 %,respectively.The optimum range and rich range of exchangeable Ca,Mg were 11.9 % and 66.1 %,27.1 % and 35.6 %,respectively.The soil available Cu,Zn,Fe and Mn were not in deficiency except for B.