Abstract:

【Objective】 This paper evaluated the effects of the tillage systems on soil quality in Chengdu Plain. The soil quality evaluation system which is suitable to the local production conditions was explored and established. In order to provide reference for enhancing the local soil productivity levels and improving soil quality, the suitable tillage systems were selected.【Method】The soil properties of different tillage systems and their effects on the crop yield index were acquired by using long-term field tests. Using principal component analysis, the evaluation index and the soil quality were evaluated and screened by the factor analysis method.【Result】A significant difference was found in comprehensive evaluation of soil quality indicators in different soil layers. The main factors in 0-10 cm are capillary porosity, soil specific gravity, seepage rate of soil saturation, soil compaction and soil organic matter. The main factors in 10-20 cm are total porosity, non-capillary porosity, soil hydroscopic water and soil compaction. The main factors in 0-20 cm are non-capillary porosity, soil specific gravity, seepage rate of soil saturation and soil compaction. The same factors in different soil layers are seepage rate of soil saturation and soil compaction, which showed that they are the local limiting factors of soil quality currently. The results of soil quality assessment showed that wheat and rice no-tillage is the best tillage system in 0-10cm, wheat no-tillage and rice conventional tillage are the best in 10-20 cm and wheat no-tillage and rice conventional tillage are the best in 0-20 cm. 【Conclusion】 Under this experimental conditions and local conditions, the good efficiency tillage system for the soil quality in the Chengdu Plain is wheat no-tillage and rice conventional tillage system.

Key words: soil quality, evaluation, factor analysis, Chengdu Plain