Abstract: In order to investigate the variation of different fertilization on soil potassium, the effect of long-term fertilization of nitrogen (N) organic manure(M) or manure with nitrogen (MN) on the amounts of total potassium and different forms of potassium in non-calcareous fluro-aquic soil was studied based on 36 years of long-term experiment. The results showed that the amounts of potassium decreased with long-term fertilization of high rate of nitrogen (N₂) fertiliz- er,compared to control treatment (CK) the water soluble potassium, exchangeable potassium, available potassium, non- exchangeable potassium and total potassium were decreased for 0. 09 mg/kg,16. 34 mg/kg,3. 61 mg/kg,12. 3 mg/kg,2. 1 g/kg,respectively. Compared to control treatment (CK),the increase in water soluble potassium was 1. 28 mg/kg and ex- changeable potassium was 27. 22 mg/kg for high rate of organic manure (M₂) with low and high rate of nitrogen (N₁or N₂) . However,the available potassium,non-exchangeable potassium and total potassium trended to increase with continue fertilization. The available potassium was correlated to soil organic matter (SOM) and cation exchange capacity (CEC) . It suggests that the M or MN fertilizer is good for increasing different forms of potassium and total potassium in non-calcareous fluro-aquic soil, but not the fertilization of single N fertilizer.

Key words: Long term fertilization, Non-calcareous fluro-aquic soil, Potassium dynamics, Potassium form

CLC Number: 

• S147.3