Effects of Different Fertilization on Releasing Capacity of Non-exchangeable Potassium in Vegetable Soils

The effects of different fertilization treatments on the characteristics of inorganic potassium were studied in a long-term experiment in the vegetable greenhouse of Shenyang Agricultural University.The results showed that the releasing amount of non-exchangeable potassium was different in different fertilization treatments.Compared to the treatment with inorganic fertilizer only,the combining use of rganic and inorganic fertilizers increased the releasing amount and rate of potassium.The highest releasing amount and rate of non-exchangeable potassium came from the combining application of N-K fertilizers,and the lowest from the combining use of N-P fertilizers.