Effects of Chemical Fertilizer Reduction Combined with Straw and Organic Fertilizer Application on Soil Acidification Mitigation and Erosion Control
[Objective]To demonstrate that appropriate application of straw and organic fertilizer can effectively improve soil quality,have a positive effect on soil acidification mitigation and erosion control.[Method]Acidified red soil was used as the research object and a comparative analysis was performed for the effects of conventional fertilization(CK),chemical fertilizer reduction(30％),straw returning(6 000 kg/hm2,FSM0),and the combination of chemical fertilizer reduction(30％)coupled with straw returning(6 000 kg/hm2)and different gradients of organic fertilizers(1 500,3 000,4 500 and 6 000 kg/hm2)(FSM1,FSM2,FSM3,and FSM4)on soil properties at different stages of rapeseed growth and rapeseed yield.[Results]The reduction of chemical fertilizers combined with straw and organic fertilizer application significantly(p＜0.05)improved soil acidity and nutrient status.Compared with CK,soil pH increased by 0.05～0.25 unit under the five treatments,while exchangeable H+,exchangeable Al3+,and exchangeable acids decreased by 10.82％～39.81％,5.18％～22.10％and 5.67％～23.90％,respectively.Additionally,the total exchangeable base increased by 7.63％～34.68％,and the total nitrogen and organic matter contents in the soil also significantly increased(by 19.22％～62.86％and 18.43％～61.50％,respectively).Analysis of soil mechanics properties indicated that with the increase of organic fertilizer application,soil shear strength was significantly enhanced,while the cohesion and internal friction angle exhibited a trend of first increasing and then decreasing.Under FSM2 treatment,the shear strength,cohesion,and internal friction angle all reached their peak values,with a respective increase of 22.22％,20.06％and 11.38％relative to CK.Economic benefit analysis revealed that FSM2 had the highest net income.[Conclusion]Based on soil acidification improvement,fertility enhancement,structural improvement,and rapeseed economic benefits,chemical fertilizer reduction(30％)coupled with straw returning(6 000 kg/hm2)and 3 000 kg/hm2 organic fertilizer application can be recommended as the optimal management strategy.The results of this study can provide a scientific foundation for improving soil acidification and increasing crop yields.
straw returning to the fieldorganic fertilizersoil aciditysoil shear strengthrapeseed yield
万方数据
维普
