Scientia Agricultura Sinica ›› 2011, Vol. 44 ›› Issue (19): 3999-4006.doi: 10.3864/j.issn.0578-1752.2011.19.009

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Assessment of Tillage Effects on Soil Quality for Double-Rice Paddy with Tilth Index

 XU  Shang-Qi, ZHANG  Ming-Yuan, SUN  Guo-Feng, TANG  Wen-Guang, CHEN  Fu, ZHANG  Hai-Lin   

  1. 1.中国农业大学农学与生物技术学院/农业部农作制度重点开放实验室
    2.湖南省土壤肥料研究所
  • Received:2010-07-26 Online:2011-10-01 Published:2011-01-21

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Abstract: 【Objective】 Improvement of soil quality is very meaningful for increasing land productivity and ecological environment. In this study, tilth index (TI) was used to evaluate the soil quality of double-rice paddy under different tillage systems in order to provide a basis for selecting reasonable tillage. 【Method】 No-tillage (NT), conventional tillage (CT) and rotary tillage (RT) were carried out in 2005 at the Ningxiang County, Hunan province. Soil organic matter (SOM), bulk density (BD), total nitrogen (TN) and pH of 0-20 cm soil were measured to calculate TI, and soil samples were collected at rice harvest time in both 2007 and 2008. TI was calculated by a proposed regression model. 【Result】 Rice yield had a significant negative correlation with bulk density (R2=0.67) and positive correlation with soil organic matter (R2=0.45). TI increased linearly with increasing rice yield (R2=0.67). TI could be easily determined through measured SOM and BD of the soil, TI = 0.40 SOM' + 0.60 BD', the proposed regression model showed the value of TI was a good indicator for optimum rice yields, as well as an evaluation of the soil quality. In this study, soil quality of all the three tillage treatments was obviously improved, the change of TI showed that NT didn’t have a better soil quality at early period of experiment, but the tendency of soil quality improvement was more significant than CT and RT, therefore long-term no-till and straw returning may be a good choice. 【Conclusion】 The value of TI, which was calculated through the proposed regression model, could be a good indicator for rice yields, as well as an evaluation of the soil quality. Soil quality of NT increased the fastest in all the three tillage systems.

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