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Acta Agron Sin ›› 2017, Vol. 43 ›› Issue (07): 1030-1042.doi: 10.3724/SP.J.1006.2017.01030

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effects of Cotton Stalk Returning on Soil Physical and Chemical Properties and Cotton Yield in Coastal Saline-Alkali Soil

QIN Du-Lin1,WANG Shuang-Lei1,2,LIU Yan-Hui1,3,NIE Jun-Jun1,ZHAO Na1,MAO Li-Li1,SONG Xian-Liang1,*,SUN Xue-Zhen1,*   

  1. The study is supported by National Natural Science Foundation of China (31601253), the Modern Agro-industry Technology Research System (SDAIT-03), Shandong Program for Improved Varieties of Agriculture (2013LZ, 2014LZ), the Natural Science Foundation of Shandong Province (ZR2016CQ20), and the Saline Alkali Land Improvement and Utilization Project of Shandong Agricultural University.
  • Received:2016-12-02 Revised:2017-07-20 Online:2017-07-12 Published:2017-04-27
  • Contact: Sun Xuezhen,E-mail: sunxz@sdau.edu.cn;Song Xianliang,E-mail: xlsong@sdau.edu.cn E-mail:qindulin2014@163.com
  • Supported by:

    The study is supported by National Natural Science Foundation of China (31601253), the Modern Agro-industry Technology Research System (SDAIT-03), Shandong Program for Improved Varieties of Agriculture (2013LZ, 2014LZ), the Natural Science Foundation of Shandong Province (ZR2016CQ20), and the Saline Alkali Land Improvement and Utilization Project of Shandong Agricultural University.

Abstract:

A continuous three-year field experiment of cotton-residue incorporation in coastal saline-alkali land was conducted, with two treatments: residue removal and residue incorporation. The successive cotton stalk returning significantly decreased soil bulk density in 0-30 cm soil layer and soil micro-aggregates with particle size <0.25 mm in 0-10 cm soil layer, while significantly increased the content of soil macro-aggregates with particle size >5 mm in 0-10 cm soil layer. Compared with the control (residue removal), the treatment of cotton residues incorporation significantly increased soil organic matter, nitrate nitrogen, ammonium nitrogen and available potassium by 13.45%, 18.57%, 22.80%, and 22.57%, respectively, while decreased soil available phosphorus and salinity by 18.29% and 16.59% at pre-sowing and each growth stage in 0-20 cm soil layer. Soil nitrate nitrogen and ammonium nitrogen were increased by 37.20% and 31.62% and soil salinity had a reduction of 19.06% after successive cotton stalk returning for three years in 20-40 cm soil layer, and also significantly increased by 38.26% and 24.83% in 40-60 cm soil layer. Successive cotton stalk returning significantly increased seed cotton yield by 11.57%, 19.01%, and 13.24% and lint yield by 18.56%, 19.78%, and 18.73% in three years, but not affected single boll weight and lint percentage.

Key words: Cotton, Stalk returning, Saline-alkali soil, Soil physical and chemical properties, Yield

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