Evaluation of the Impact of Organic Fertilizer Substitution on Soil Fertility,Nitrogen and Phosphorus Utilization Efficiency and Rice Yield in Chaohu Lake Basin
In order to investigate the effects of partial substitution of chemical fertilizer with organic fertilizer on rice yield,nutrient utilization,nitrogen and phosphorus fertilizers efficiency and soil fertility under the same phosphorus application level,a field plot experiment is carried out.A total of 6 treatments are set up in the experiment,including no fertilization(CK),conventional fertilization(CF),and treatments of 100%,70%,50%,and 30%commercial organic fertilizer replacing chemical fertilizers(M1,M2,M3,M4).The results show that the yield of rice of treatment M4 is the highest,which is 8.18%higher than that of treatment CF.The partial productivity,agronomic efficiency,and utilization efficiency of nitrogen and phosphorus fertilizers of treatment M4 are the highest,and as the proportion of organic fertilizer substitution increases,the partial productivity,agronomic efficiency,and utilization efficiency of nitrogen and phosphorus fertilizers gradually decrease;there is no significant difference in nitrogen accumulation in the aboveground parts of rice treatments M1 to M4,while the phosphorus accumulation in the aboveground parts of rice treatments M2 and M3 increase by 37.73%and 36.30%,respectively,compared to the CF treatment.After harvest of rice,the soil pH and organic matter content of treatments M1 to M4 increases with the increase of organic fertilizer substitution.The appropriate proportion for organic fertilizer to replace chemical fertilizers is 30%to 50%.
organic fertilizer substitutionsoil fertilityfertilizer efficiencyChaohu Lake basinrice
NETL
NSTL
万方数据
