Journal of Integrative Agriculture ›› 2013, Vol. 12 ›› Issue (4): 694-710.DOI: 10.1016/S2095-3119(13)60288-9

• 论文 • 上一篇    下一篇

Long-Term Effect of Fertilizer and Rice Straw on Mineral Composition and Potassium Adsorption in a Reddish Paddy Soil

 LIAO Yu-lin, ZHENG Sheng-xian, NIE Jun, XIE Jian, LU Yan-hong , QIN Xiao-bo   

  1. 1.Soil and Fertilizer Institute of Hunan Province, Hunan Academy of Agricultural Sciences/Scientific Observing and Experimental Station of Arable Land Conservation (Hunan), Ministry of Agriculture, Changsha 410125, P.R.China
    2.Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/The Key Laboratory for Agro-Environment, Ministry of Agriculture, Beijing 100081, P.R.China
  • 收稿日期:2012-06-16 出版日期:2013-04-01 发布日期:2013-04-07
  • 通讯作者: Correspondence ZHENG Sheng-xian, Tel: +86-731-84691576, Fax: +86-731-84691581, E-mail:shengxianzheng@foxmail.com
  • 作者简介:LIAO Yu-lin, Tel: +86-731-84693197, E-mail: ylliao2006@126.com;
  • 基金资助:

    This research was funded by the the Public Service Sectors (Agriculture) Research Special Funds, China (201203013-06). The work was also supported in partial by the International Plant Nutrition Institute (IPNI China Program: Hunan-16) and the Key Technologies R&D Program of China during the 12th Five-Year-Plan period (2012BAD05B05-3).

Long-Term Effect of Fertilizer and Rice Straw on Mineral Composition and Potassium Adsorption in a Reddish Paddy Soil

 LIAO Yu-lin, ZHENG Sheng-xian, NIE Jun, XIE Jian, LU Yan-hong , QIN Xiao-bo   

  1. 1.Soil and Fertilizer Institute of Hunan Province, Hunan Academy of Agricultural Sciences/Scientific Observing and Experimental Station of Arable Land Conservation (Hunan), Ministry of Agriculture, Changsha 410125, P.R.China
    2.Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/The Key Laboratory for Agro-Environment, Ministry of Agriculture, Beijing 100081, P.R.China
  • Received:2012-06-16 Online:2013-04-01 Published:2013-04-07
  • Contact: Correspondence ZHENG Sheng-xian, Tel: +86-731-84691576, Fax: +86-731-84691581, E-mail:shengxianzheng@foxmail.com
  • About author:LIAO Yu-lin, Tel: +86-731-84693197, E-mail: ylliao2006@126.com;
  • Supported by:

    This research was funded by the the Public Service Sectors (Agriculture) Research Special Funds, China (201203013-06). The work was also supported in partial by the International Plant Nutrition Institute (IPNI China Program: Hunan-16) and the Key Technologies R&D Program of China during the 12th Five-Year-Plan period (2012BAD05B05-3).

摘要: Increasing K+ adsorption can be an effective alternative in building an available K pool in soils to optimize crop recovery and minimize losses into the environment. We hypothesized that long-term fertilization might change K+ adsorption because of changes in the chemical and mineralogical properties of a rice (Oryza sativa L.). The aims of this study were (i) to determine clay minerals in paddy soil clay size fractions using X-ray diffraction methods and a numerical diagramdecomposition method; (ii) to measure K+ adsorption isotherms before and after H2O2 oxidation of organic matter, and (iii) to investigate whether K+ adsorption is correlated with changes in soil chemical and mineral properties. The 30-yr longterm fertilization treatments caused little change in soil organic C (SOC) but a large variation in soil mineral composition. The whole-clay fraction (<5 μm) corresponded more to the fertilization treatment than the fine-clay fraction (<1 μm) in terms of percentage of illite peak area. The total percentage of vermiculite-chlorite peak area was significantly negatively correlated with the total percentage of illite peak area in the <5 μm soil particles (R=-0.946, P<0.0006). Different fertilization treatments gave significantly different results in K+ adsorption. The SOC oxidation test showed positive effects of SOC on K+ adsorption at lower K+ concentration ( 120 mg L-1) and negative effects at higher K+ concentration (240 mg L-1). The K+ adsorption by soil clay minerals after SOC oxidization accounted for 60-158% of that by unoxidized soils, suggesting a more important role of soil minerals than SOC on K+ adsorption. The K+ adsorption potential was significantly correlated to the amount of poorly crystallized illite present (R=0.879, P=0.012). The availability of adsorbed K+ for plant growth needs further study.

关键词: long-term experiment , mineral composition , potassium adsorption , reddish paddy soil

Abstract: Increasing K+ adsorption can be an effective alternative in building an available K pool in soils to optimize crop recovery and minimize losses into the environment. We hypothesized that long-term fertilization might change K+ adsorption because of changes in the chemical and mineralogical properties of a rice (Oryza sativa L.). The aims of this study were (i) to determine clay minerals in paddy soil clay size fractions using X-ray diffraction methods and a numerical diagramdecomposition method; (ii) to measure K+ adsorption isotherms before and after H2O2 oxidation of organic matter, and (iii) to investigate whether K+ adsorption is correlated with changes in soil chemical and mineral properties. The 30-yr longterm fertilization treatments caused little change in soil organic C (SOC) but a large variation in soil mineral composition. The whole-clay fraction (<5 μm) corresponded more to the fertilization treatment than the fine-clay fraction (<1 μm) in terms of percentage of illite peak area. The total percentage of vermiculite-chlorite peak area was significantly negatively correlated with the total percentage of illite peak area in the <5 μm soil particles (R=-0.946, P<0.0006). Different fertilization treatments gave significantly different results in K+ adsorption. The SOC oxidation test showed positive effects of SOC on K+ adsorption at lower K+ concentration ( 120 mg L-1) and negative effects at higher K+ concentration (240 mg L-1). The K+ adsorption by soil clay minerals after SOC oxidization accounted for 60-158% of that by unoxidized soils, suggesting a more important role of soil minerals than SOC on K+ adsorption. The K+ adsorption potential was significantly correlated to the amount of poorly crystallized illite present (R=0.879, P=0.012). The availability of adsorbed K+ for plant growth needs further study.

Key words: long-term experiment , mineral composition , potassium adsorption , reddish paddy soil