Effect of alkali reducing and salt inhibiting amendments on saline-alkali soil
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DOI:10.7606/j.issn.1000-7601.2019.04.36
Key Words: saline alkali soil  soil amendment  reducing alkali and inhibiting salt  physiochemical proprieties  yield
Author NameAffiliation
QIN Ping Institute of Environmental Engineering, Ningxia University, Yinchuan, Ningxia 750021, China Ningxia Key Laboratory of Resource Assessment and Environment Regulation in Arid Region, Ningxia University, Yinchuan, Ningxia 750021, China 
ZHANG Jun-hua Institute of Environmental Engineering, Ningxia University, Yinchuan, Ningxia 750021, China Ningxia Key Laboratory of Resource Assessment and Environment Regulation in Arid Region, Ningxia University, Yinchuan, Ningxia 750021, China 
SUN Zhao-jun Institute of Environmental Engineering, Ningxia University, Yinchuan, Ningxia 750021, China Ningxia Key Laboratory of Resource Assessment and Environment Regulation in Arid Region, Ningxia University, Yinchuan, Ningxia 750021, China 
JIA Ping-ping College of Resources and Environment, Ningxia University, Yinchuan, Ningxia 750021, China 
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Abstract:
      Saline and alkaline soils are usually observed in arid and semi-arid regions as well as in areas with poor drainage. Severe saline-alkali soil in the north of Yinchuan in Ningxia selected as the study object. Changes in soil pH, total salinity, physiochemical properties of severe saline-alkali soil, effect of growth parameters of rice after the application of flue gas desulfurization, furfural residue, vinegar residue, and bacterial manure were studied for four consecutive years. The results showed that: (1) Soil pH value of T2 (single application of flue gas desulphurization gypsum) and T3-T6 (combined application of amendments) in 0~20 cm layer significantly decreased than that of T1 (check), and the decreasing amplitude of T5 (flue gas desulfurization + furfural residue + vinegar residue + bacterial manure) was the biggest; T6 (flue gas desulfurization + bacterial manure) decreased the pH least; the pH difference of T3 (flue gas desulfurization + furfural residue + bacterial manure) and T4 (flue gas desulfurization + vinegar residue + bacterial manure) were small. The variation tendency of ESP (exchangeable sodium percentage) and EC (electric conductivity) were in the same trend as the pH, and their decrease was greater than pH. (2) The organic matter in treatments of T2~T6 increased by 1.30, 3.97, 4.03, 5.16 g·kg-1 and 2.15 g·kg-1 over that with T1’s. The variation tendencies of alkali-hydrolyzable, available P, and available K were similar to the organic matter in four years, but the increasing amplitudes were bigger than organic matter. (3) Seedling preservation rate of T2 was higher than that with T1, but lower than the treatments of combined amendments. Seedling preservation rate of T5 reached the highest, and seedling preservation rate of T4 was slightly higher than that with T3’s. Lifting effect on plant heights were less than seedling preservation rates with combined amendments. Every amendment increased the spike length, number of grain per spike, setting percentage and decreased the empty chaff number of rice. The average yields of T2~T6 increased by 77.92%, 118.48%, 128.93%, 158.10%, and 102.13% than that with T1’s in four years. The net income of T4 was the highest among treatments followed by T5. On the whole, flue gas desulfurization + furfural residue + vinegar residue + bacterial manure decreased pH, ESP, EC of soil, increased the organic matter and nutrients, and achieved a significant increase in crop yield and income.
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