Abstract: Based on 36 years long-term locating fertilization,the research using the ¹⁵N tracer tests,studied the effects of long-term application of organic fertilizers on nitrogen absorption and utilization of wheat-maize.The results showed that under long-term application of organic fertilizer treatment,the nitrogen efficiency was the highest with 53.15%,and secondly,by the lower organic fertilizer with lower N fertilizer treatment with 51.52%,respectively increased by 24.33% and 20.51% more than CK.Under long-term single organic fertilizer treatment,the residual N was the highest accounting for 40.07%,and secondly,by the high organic fertilizer with lower N fertilizer treatment with 37.07%,respectively increased by 42.5% and 31.83% more than CK.Under long-term application of organic fertilizer treatment,the nitrogen loss rates was the lowest with 10.84%,reduced 69.56% more than CK.Under long-term single organic fertilizer treatment,the protein content was highest of wheat-maize,15.76% and 10.88%,respectively increased by 14.29% and 10.52% more than CK.Under long-term single organic fertilizer treatment,the yield of wheat and maize is the highest respectively increased by 500% and 428.44% more than CK.

Key words: Long-term located fertilization, Wheat-maize, Nitrogen utilization, Yield and quality

CLC Number: 

• S143.1