Effects of different long term fertilizing systems on fertilizer use efficiency in red paddy soil

This paper compared fertilizer use efficiency among different systems over 17 years in a long-term fertilization field experiment in red paddy soil, rice yield and the apparent recovery efficiency(ARE), agronomic- (AUE), physiological- use efficiency (PUE) of different nutrients were studied. The results showed that, the yields of early and late rice in organic-inorganic fertilizing system (OM) were always the highest, compared to CK, their yields increased 108.9% and 53.8%, respectively. The second is saving-fertilizing system (JF), their yields increased 83.3%、47.8% than in CK respectively, which indicated that, inorganic-organic fertilizing system could significantly promote rice yield in the experimental condition. The studying of ARE, AUE and PUE showed that, fertilizer use efficiency of JF and NPK were greater than other fertilizing systems. Considering the yield and fertilizer use efficiency, it is concluded that, JF is more pronounced in modern agricultural development demand than others.