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cje ›› 2012, Vol. 31 ›› Issue (07): 1745-1750.

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Gypsum application in amelioration of soda-alkaline soil.Ⅰ. Determination of economical application amount.

JIN Liang1**, WU Li-geng2, WEI Dan1, HU Ke-lin3, ZHAO Li-bing4, WEI Lu-yu5   

  1. (1Heilongjiang Academy of Soil Fertilizer and Environment Resources Institute, Heilongjiang Key laboratory of Soil Environment and Plant Nutrition, Heilongjiang Fertilizer Engineering Technology Research Centre, Harbin 150086, China; 2College of EcoEnvironment, Inner Mongolia Agricultural University, Hohhot 010019, China; 3Resources and Environment Institute of China Agricultural University, Beijing 100086, China; 4 Shuangyashan Agriculture Committee, Shuangyashan 155100, Heilongjiang, China; 565426 Force Agricultural and Sideline Basement, Dongshan District, Hegang city, Hegang 154107, Heilongjiang, China)
  • Online:2012-07-10 Published:2012-07-10

Abstract: Applying gypsum can ameliorate saline-alkali soil, and soil column leaching experiment is one of the methods to verify the amelioration effect. In this study, the ameliorating soil layer was defined as 0-40 cm, and an indoor soil column leaching experiment was conducted. The 0-10 cm soil layer was thoroughly mixed with the calculated amounts of gypsum, and the filtrate was collected to determine the ionic composition which was then converted into salt. Reasoning calculation method was adopted to calculate the amounts of applied gypsum in the processes of dissolution, transformation, and leakage as well as the amounts of the applied gypsum acted with alkaline salts and exchangeable sodium and magnesium. The results showed that after four times of leaching, the physical and chemical conditions of the soil column improved remarkably, infiltration time reduced, soil pH value decreased from 9.25 to 8.20, and soil exchangeable sodium percentage basically reached to 10. There still had some gypsum left. Theoretically, the most economical application amount of gypsum for the amelioration of soda-alkaline soil was 0.05 t·hm-2.

Key words: Tetranychus cinnabarinus, Zea mays,  DIMBOA, total phenolic, trypsin inhibitor, chymotrypsin inhibitor.