| Effects of tillage on soil aggregates and crop yield on gentle slope lands in Southern Ningxia |
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| DOI：10.7606/j.issn81000-7601.2020.03.31 |
| Key Words: tillage soil aggregates corn\|patato rotation crop yield |
| Author Name | Affiliation | | LEI Jinyin | Institution of Agricultural Resource and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Ningxia, Yinchuan 750002, China | | HE Jinqin | Institution of Agricultural Resource and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Ningxia, Yinchuan 750002, China | | LEI Xiaoting | Institution of Agricultural Resource and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Ningxia, Yinchuan 750002, China | | ZHOU Lina | Institution of Agricultural Resource and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Ningxia, Yinchuan 750002, China | | YU Jianjun | Guanting Agro\|technical Service Center, Yuanzhou District of Guyuan，Guyuan, Ningxia 756000, China | | JI Lidong | Institution of Agricultural Resource and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Ningxia, Yinchuan 750002, China | | ZHANG Hui | Guanting Agro\|technical Service Center, Yuanzhou District of Guyuan，Guyuan, Ningxia 756000, China | | LU Fang | Guanting Agro\|technical Service Center, Yuanzhou District of Guyuan，Guyuan, Ningxia 756000, China |
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| Abstract: |
| In order to explore the effects of tillage on the soil aggregate characteristics and crop yield under rotation system in the gentle slope lands in Southern Ningxia, four tillage measures including the traditional culture (CK), the furrow without film covered（NH), the half covered furrow with film (HP), and fully\|covered furrow with film (WP) were studied under corn\|potato rotation in 2015-2016. The results showed that different measures significantly affected the mechanically\|stable aggregates and water\|stable aggregates of 0~20 cm soil while the effects on 20~40 cm soil was not significant. The contents of mechanically\|stable aggregates > 5 mm and 2~5 mm of 0~20 cm soil were high under CK, WP, and HP treatments while the contents of mechanically\|stable aggregates of 1~2 mm and 0.5~1 mm were high under NH treatment，which were 16.25% and 13.38%, respectively. The content of mechanically\|stable aggregates was lowest under CK, and that of > 5 mm under CK treatment was 30.99%, which was significantly higher than the other three treatments, while that of 1~2 mm, 0.5~1 mm, and 0.25~0.5 mm under NH were significantly higher than the other tillage. The proportion of water\|stable aggregates > 5 mm decreased sharply under each treatment. Under NH, HP and WP treatment, in the 0~20 cm and 20~40 cm soil, the MWD of mechanically stable aggregates was significantly lower than CK, and the MWD of water\|stable aggregates were both higher than CK. Under different treatments, the fractal dimension of soil mechanically stable agglomerates in 0~20 cm soil was lower than that of water\|stable aggregates, and the order from low to high was: CK < HP < WP < NH, respectively, were 2.65, 2.66, 2.67, 2.69, and 2.80, 2.85, 2.86, 2.87. Compared to CK, yields under NH, HP, and WP increased by 10.5%, 13.3%, and 39.2%. It can be seen that tillage can affect the composition and stability of soil aggregates structures by changing the surface micro environment. At the same time, NH had an advantage in improving soil water\|stable aggregates, but its stimulation was not prominent. This asynchrony indicated that good soil aggregates construction forming needs a long\|term continuous process. |
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