| Effects of soil improvement measures on soil structure， nutrients and crop yield of maize\|soybean intercropping system |
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| DOI：10.7606/j.issn.1000-7601.2026.01.23 |
| Key Words: soil improvement soil structure soil nutrients maize\|soybean intercropping yield medium\|low yield farmland |
| Author Name | Affiliation | | LI Henan | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | LI Jinchao | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | FU Haochuan | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHANG Haolei | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | WEN Jiaxuan | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | Pang Jinwen | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | FANG Yanxin | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | DONG Qin’ge | State Key Laboratory of Soil Erosion and Dryland Agriculture on the Loess Plateau, Northwest A&F University, Yangling, Shaanxi 712100, China
College of Soil and Water Conservation Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | LIANG Fuqin | Yan’an Institute of Agricultural Sciences, Yan’an, Shaanxi 716000, China | | FENG Hao | State Key Laboratory of Soil Erosion and Dryland Agriculture on the Loess Plateau, Northwest A&F University, Yangling, Shaanxi 712100, China
College of Soil and Water Conservation Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| To address the problems of poor soil structure, weak fertility, and low crop productivity in medium\| and low\|yield fields on the Loess Plateau, field experiments on soil improvement were carried out in 2023. Six treatments were traditional fertilization (CK), γ-polyglutamic acid water\|retaining agent (P), soil loosening agent (S), 30% organic fertilizer substitution (F), 30% organic fertilizer substitution + γ-polyglutamic acid water\|retaining agent (FP), and 30% organic fertilizer substitution + soil loosening agent (FS). Their effects on soil structure, nutrients, and yield of a dryland maize\|soybean intercropping system were analyzed. The results showed that all improvement measures significantly reduced soil compaction by 15.90% to 28.19%, and increased maize yield by 12.07% to 30.73%. Compared with CK, the FS treatment significantly reduced soil bulk density by 7.01%, enhanced mean weight diameter (MWD) and geometric mean diameter (GMD) of soil aggregates by 18.26% and 21.96%, respectively. The content of soil organic matter, total nitrogen, and available phosphorus was significantly increased by 44.70%, 74.22%, and 100.95%, respectively. The grain number per ear, 100-grain weight, and yield of maize were increased by 16.11%, 10.58%, and 30.73%, respectively. Soybean yield and 100-grain weight showed slight increases under all improvement measures, but no statistically significant differences were observed compared to CK. In conclusion, the 30% organic fertilizer substitution + soil loosening agent (FS treatment) proved most effective in improving soil structure, enhancing soil fertility, and increasing crop yields. This method is therefore recommended as an effective measure for improving soil quality and crop productivity in medium\|low yield dryland areas on the Loess Plateau. |
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