Absorption of inorganic nutrients by green soyabeans and maize in the field under continuous application of three major nutrients.

摘要

The absorption of NPK by soyabean and maize plants was examined in a trial comparing 23 years of consecutive application of different combinations of N, P and K. In soyabeans, the absorption of N and crop yield were increased by the application of P. In contrast, maize responded weakly to P fertilizer, and its yield was low in all experimental plots. It is suggested that this may be due to the lowering of soil fertility from long-term application of chemical fertilizers.