Organic Manure Partial Replacing Chemical Fertilizer: Effect on Supply Ability and Apparent Budget of Rice Soil Nitrogen

doi:10.11923/j.issn.2095-4050.cjas18020005

Abstract

Abstract: We carried out five years location experiments to study the effect of manure partial replacing chemical fertilizer on rice yield, nitrogen use efficiency, and soil mineral nitrogen change in the Yangtze and Huaihe river basins, to provide technological and scientific evidence for rational utilization of manure resources and the adjustment of rice fertilization pattern. The results showed that manure had a significant impact on NO3--N and NH4+-N content in 0-20 cm soil layer compared with chemical fertilizer treatment, treatments of manure could reduce soil NH4 +-N content significantly after rice tillering and bolting, and increase apparent budget of soil nitrogen during rice growth season. Rice yield increased continuously in 5 years of manure partial replacing chemical fertilizer. Under the equal nitrogen ratio, there was no significant difference in rice yield among different fertilization treatments in the first three years, but from the fourth year, the yield was higher than that of HY. Nitrogen use efficiency of HECF and HEDM was 14.7% and 8.6% higher than that of HY, respectively. Manure treatment increased the stability and sustainability of rice yield, reduced the loss of soil mineral nitrogen, and increased the apparent budget of soil nitrogen and nitrogen efficiency. Manure partial replacing chemical fertilizer is a rational fertilization pattern to stabilize rice yield increase and improve nitrogen efficiency.

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