Nutrient evolution tendency at some location monitored fields in Fujian Province

The nutrient contents of the surface soils at 16 cropped fields, among which 12 were established by the province and 4 by the state, were monitored during 1998-2004 in order to reveal the nutrient evolution tendency of the cropped fields in Fujian Province.The content of total N and organic matter in these soils increased slightly, the content of available P increased evidently whereas that of the alkali-hydrolyzable N decreased.The content of available K in paddy rice fields decreased while that in uplands increased slightly.All the evolution had no significant differences.The results indicated that N and P fertilizers were generally applied in excessive amount in Fujian Province.