Evaluation of Current Soil Fertility in Main Rice Producing Areas of Changsha
In 2023,340 soil samples were collected from paddy fields in four counties(cities and districts)in the main rice producing areas of Changsha City,including Changsha County,Wangcheng District,Ningxiang City,and Liuyang City,and the nutrient contents of soil pH value,organic matter,total nitrogen,alkali-hydrolyzed nitrogen,available phosphorus,and rapidly available potassium were determined.The results are as follows.(1)The characteristics of soil fertility in the main rice producing areas of Changsha are different.The variation coefficient of soil pH value in Changsha County,Wangcheng District,and Liuyang City is the smallest,indicating a small variation.The organic matter,total nitrogen,and alkali-hydrolyzed nitrogen in the four counties(cities and districts)belong to moderate variation.The variation coefficient of soil available phosphorus in the four counties(cities and districts),as well as that of rapidly available potassium in Changsha County,Liuyang City,and Ningxiang City are large,which belong to high variation.(2)Soil pH value in the four counties(cities and districts)is mainly secondary and tertiary,and there are soil acidification problems.(3)The content of soil organic matter,total nitrogen,and alkali-hydrolyzed nitrogen is rich,while the content of available phosphorus is general,and the content of rapidly available potassium is generally low.In general,the problem of soil acidification still exists in the study area,and the pH should be further regulated.
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万方数据
