Study On Evolution Tendency Of Soil Fertility And Improvement Strategy Of Fujian

The current levels of organic matter, nitrogen, phosphorus, potassium and pH in the surface soils of the cultivated lands in Fuqing City, Tongan County, Zhangpu County, Nanan City, Youxi County, Xianyou County, Pucheng County, Jianou County, Shanghang County and Gutian County in Fujian Province were compared with the data obtained during the second national soil survey in 1980's. The evolution tendency of the fertility in the soils was analyzed, the reasons were discussed, and some improvement strategies were then proposed.The following results were achieved. The current level of soil organic matter is in the middle range, with having increased in some areas while decreased in the others. The current N level is slightly higher than middle range. Since 1980's, the contents of total N are stable on the whole with slight increase. The contents of alkali-hydrolysable N increased in some areas while decreased in the others. The current levels of P are generally rich of the soils in the studied areas. Since 1980's, the total P increased in some areas while decreased in the others. The available P in all the areas increased significantly. Potassium in most of the soils decreased and the current K level being universally deficit. Acidification is apparent in the soils with most of the soils being acidic and slight acidic.In order to improved soil quality, we must take some effective measures according to local conditions. As for the whole province, the following measures are proposed: promoting the use of organic manures, stabilizing N fertilizer inputs and establishing better techniques of N fertilizing, reducing phosphate application, increasing potassium input, and applying more alkaline fertilizers.