江阴市在第一、二次土壤普查后,于1996年秋又对全市1981年取过样的部分典型田块进行了取样化验。同一块田15年来的土壤养分显示,土壤有机质平均含量由23.0g/kg增加到2.74g/kg;全氮含量由1.426g/kg提高到1.745g/kg;速效磷含量由78mg/kg提高到8.9mg/kg;速效钾含量由75.6mg/kg,降到68.8mg/kg,缓效钾也由313mg/kg降到292mg/kg(见表1)。 Jiangyin City, after the first and second soil censuses, conducted sampling tests on some typical plots sampled in 1981 in the autumn of 1996. The soil nutrients in the same field over the past 15 years showed that the average content of soil organic matter increased from 23.0g / kg to 2.74g / kg, the total nitrogen content increased from 1.426g / kg to 1.745g / kg, the available phosphorus increased from 78mg / kg to 8.9mg / kg; available potassium decreased from 75.6mg / kg to 68.8mg / kg, slow potassium from 313mg / kg to 292mg / kg (see Table 1).