| Effects of combinations of modifiers on physical and chemical properties of alkaline soil and growth of Lycium chinense in Hetao irrigation area |
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| DOI：10.7606/j.issn.1000-7601.2023.05.13 |
| Key Words: soil functional modifiers combined application Lycium chinense soil physical and chemical properties Hetao irrigation area |
| Author Name | Affiliation | | HUANG Pujiang | College of Agriculture, Ningxia University, Yinchuan, Ningxia 750021, China
College of Ecology and Environment, Ningxia University, Yinchuan, Ningxia 750021, China | | FANG Zhao | Institute of Soil and Water Conservation, Northwestern A&F University, Yangling, Shaanxi 712100, China | | YU Hailong | College of Geography Science and Planning, Ningxia University, Yinchuan, Ningxia 750021, China | | ZHANG Fengju | College of Ecology and Environment, Ningxia University, Yinchuan, Ningxia 750021, China | | HUANG Juying | College of Ecology and Environment, Ningxia University, Yinchuan, Ningxia 750021, China |
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| Abstract: |
| To evaluate the effects of desulfurization gypsum with different functional modifiers on the improvement of alkaline soils in Hetao irrigated area, and to identify the best solution for the improvement of alkaline soils in Hetao irrigated area, a field trial of alkaline soil improvement was established in Hetao irrigated area of Ningxia. The field trials used Lycium chinense as the test material with treatments of control (T1), desulphurization gypsum alone (T2), desulphurization gypsum + vinasse + bacterial fertilizer (T3), desulphurization gypsum + bacterial fertilizer (T4), desulphurization gypsum + vinasse + bacterial fertilizer + water retention agent (T5), desulphurization gypsum + micronutrient fertilizer (T6), and desulphurization gypsum + induced resistance (T7) to compare and analyze the effects of different amendment measures on the soil salinity index, nutrient status and agronomic traits of L. chinense (survival rate/preservation rate, plant height and yield) for selecting the best improvement scheme for alkaline soil management in this area. The results indicated that treatments T2 to T7 exhibited greater effectiveness in enhancing soil organic carbon (5.4% to 88.8%), total nitrogen (8.0% to 31.3%), alkali\|hydrolysable nitrogen (11.4% to 41.7%), reducing pH (4.8% to 10.3%), sodium adsorption ratio (SAR) (5.5% to 51.6%), and total salt content (5.5% to 51.6%) in the top 20 cm of soil over the course of four years. These effects were significantly more pronounced than those observed at a depth of 20~40 cm, with the degree of influence progressively increasing with the duration of the improvement process. However, the overall impact on total phosphorus and fast\|acting phosphorus and potassium content in the soil was weak or did not exhibit consistent patterns. Among the different amendments, the T5 treatment proved to be the most efficacious in augmenting soil organic matter and nutrient content, reducing soil pH, mitigating soil salt stress, and yielding higher survival/preservation rates (83.88%~92.22%), plant height (74.16~140.13 cm), and crop yield (0.70~2.31 kg·hm-2) for L. chinense. Furthermore, correlation analysis revealed that pH, total salt, organic carbon, alkaline soluble nitrogen, fast\|acting potassium content in different soil layers and interannual climatic variability (annual precipitation and temperature) were the main factors affecting the agronomic traits of L. chinense. Considering the effect of different functional modifiers agents in increasing soil organic matter and nutrient content, reducing alkali and suppressing salt, and achieving increased yield and income of L. chinense, the combination of desulfurized gypsum + vinasse + bacterial fertilizer + water retention agent was the most prominent, though its improvement effect still needs further extension verification in the same type of saline areas in the Hetao area. |
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