Effects of tillage methods and biochar on soil nutrients,enzyme activity and maize yield
In order to explore the response of irrigated silt soil to different tillage methods and different biochar additions,the nutrient content and enzyme activity were measured,in order to provide a scientific basis for selecting suitable tillage methods and fertilization systems in the Hexi Corridor region.An 8-year field experiment was conducted with four tillage methods(N:no-tillage,M:less-tillage,F:autumn ploughing,S:subsoiling)and three biochar application rates(B1:2.5 t/hm2,B2:5.0 t/hm2,B3:7.5 t/hm2)in maize field,and without tillage and no application of biochar was the control(CK).The results showed that:(1)In the 0-20 cm soil layer,compared with CK,different treatments significantly increased soil organic carbon,available nutrients and enzyme activity(P<0.05).Soil organic carbon,available nutrients and soil enzyme activity increased with the increase of biochar application rate under different tillage methods.(2)In 20-40 cm soil layer,compared with CK,different treatments increased soil organic carbon,available nutrients and enzyme activity,but there was no significant difference among treatments(P>0.05).(3)Different treatments could increase maize yield,but there was no significant difference among treatments(P>0.05).Compared with CK treatment,the yield-increasing effect of each biochar treatment was between 0.07%and 21.30%,and the yield of FB3 treatment was the highest,which was significantly higher than that of other treatments(P<0.05).(4)Correlation analysis showed that there was a significant positive correlation between soil nutrients and soil enzyme activities(P<0.05).Subsoiling tillage combined with biochar addition could effectively improve soil nutrients and enzyme activity,which was conducive to crop growth,and it was a more suitable tillage method in this area.Biochar above 7.5 t/hm2 could be applied as an important additive for the improvement of irrigated silt soil.
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