Effects of Continuous Years of Zero Tillage and Crop Rotation on Soil Fertility
This study investigates the effects of consecutive years of zero tillage and crop rotation on soil fertility.An 11-year experimental study on a double cropping system of paddy rice and upland wheat using double-zero-tillage was conducted in the Yellow River Basin of Ningxia.Conventional soil nutrient determination methods were used to analyze the nutrients,texture,pH value,and other parameters of soil that retained crop residues under zero tillage for consecutive years,focusing on the impact of conservation agricultural techniques on soil nutrients.The results indicate that there was no significant difference in soil texture changes in the 0～20 cm soil layer between consecutive years of zero tillage and conventional tillage(CK).However,after seven consecutive years of double-zero-tillage in the winter wheat-rice rotation,there was a significant increase in soil nutrients in the 0～10 cm soil layer,particularly in the 0～5 cm layer,and this increase was also observed in deeper soil layers.Following an additional four years of monoculture under zero tillage with winter wheat(totaling 11 years of zero tillage),the soil organic matter,total nitrogen,and available potassium contents exhibited a declining trend over time;total potassium and available potassium content were lower than those in the CK.Although the effective iron content showed a slight upward trend,the contents of available zinc,manganese,and copper displayed a downward trend.Overall,zero tillage combined with reasonable crop rotation is a fundamental principle in conservation agriculture.
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