Effect of Organic Manure Applied Combining with Inorganic Fertilizer on Nitrogen Conformation and Yield of Rice in Red Soil Paddy Field

Dynamic of Nitrogen in paddy field, nitrogen using efficiency and nitrogen on rice yield were studied in hilly red soil paddy field in south of Hunan provinces after organic manure applied combining with inorganic fertilizer. The results showed. organic manure applied combining with inorganic fertilizer can increase and retain nitrogen content in paddy soil, nitrogen use efficiency increased also. For early rice, yield of rice grain in NPKM were higher than that in M and NPK, but there were not significant difference among these treatments. For late rice, yield of rice grain in NPKM treatment were higher than that in M treatment and significant higher than that in NPK treatment. Nitrogen use efficiency was 33.5%(early rice),22.8%(late rice) in NPK treatment and was 41.04%(early rice), 32.4%(late rice) in M treatment 40.07% (early rice),35.6%(late rice) in NPKM treatment respectively.