Effects of Desulfurized Gypsum Applied Combined with Polyglutamic Acid on Improving Saline Soil
Journal Title: Bulletin of Soil and Water Conservation - Year 2023, Vol 43, Issue 6
Abstract
[Objective] The effects of desulfurized gypsum and polyglutamic acid (γ-PGA) improves saline soil were studied in order to provide a theoretical and technical basis for improving saline soil in Northwest China. [Methods] Simulated leaching tests in soil columns and simulated growth tests in pots were used to determine the effect of combining desulfurized gypsum with γ-PGA on saline soils from the perspectives of promoting salt leaching, reducing soil salinity, lowering soil pH value, improving soil nutrient status, and promoting crop growth. [Results] The leaching tests showed that combining desulfurized gypsum with γ-PGA could further reduce soil pH value after leaching and increase Na+ leaching; reduce and Cl- contents after leaching, but increase , Ca2+, and Mg2+ contents; and effectively reduce the sodium adsorption ratio (SAR) value of the soil. Desulfurized gypsum combined with γ-PGA significantly increased maize height, leaf area, and dry weight, with maximum dry weight at 30 days of growth increasing by 54.40% compared with the control treatment, and by 40.27% and 29.47% compared with desulfurized gypsum and γ-PGA treatments alone, respectively. In addition, soil pH value was lower and soil N, P, and K nutrient contents and soil enzyme activities were higher after the plants were harvested from the combined desulfurized gypsum and γ-PGA treatment. [Conclusion] The application of desulfurized gypsum and γ-PGA can produce complementary and synergistic effects, thereby further promoting soil ion exchange, lowering pH value, increasing soil nutrient content, and promoting crop growth.
Authors and Affiliations
Lingzhi Zhang, Meng Li, Hongyi Li, Lina Yin, Shiwen Wang
Keywords
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- EP ID EP762753
- DOI 10.13961/j.cnki.stbctb.2023.06.015
- Views 18
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