| Effects of water retention and nitrogen fertilizer interactions on physiological characteristics and water and nitrogen use in maize |
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| DOI：10.7606/j.issn.1000-7601.2025.02.22 |
| Key Words: maize water retention nitrogen fertilizer physiological characteristics nitrogen uptake water use efficiency |
| Author Name | Affiliation | | LI Changliang | Construction Cost and Fee Management Center of Water Conservancy Projects, the Water Resources Department of Gansu Province, Lanzhou, Gansu 730040, China | | ZHANG Fucang | The Key Laboratory of Agricultural Soil and Water Engineering in Arid Areas Subordinated to the Ministry of Education, Yangling, Shaanxi 712100, China
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | LUO Tianfeng | Construction Cost and Fee Management Center of Water Conservancy Projects, the Water Resources Department of Gansu Province, Lanzhou, Gansu 730040, China |
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| Abstract: |
| A total of nine treatments were established using an incomplete orthogonal experimental design, with each treatment replicated three times in a pot experiment. The treatments included three water\|holding agent types \[Demi high absorbent resin (PAM, polyacrylamide); Walter multifunctional drought tolerant water retainer (WT, bump (organic)/polyacrylic acid (inorganic) water retainer); Haiming high energy drought tolerant water retainer (HM, sodium polyacrylate type)\], three water\|retaining agent application rates (0‰, 2‰, and 4‰ of the dry soil mass, respectively), and three nitrogen fertilizer application rates (0, 0.25, 0.50 g·kg-1). The effects of water retention agent and N fertilizer on growth physiology, root vigor, nitrogen uptake and water use of maize seedlings were investigated. The results showed that compared with the treatment without application of water retainer and nitrogen fertilizer, water retainer with nitrogen fertilizer significantly increased seedling maize plant height, leaf area, aboveground dry matter mass, leaf chlorophyll content, root vigor, nitrogen uptake and water use efficiency by 9.30%, 14.88%, 68.85%, 16.26%, 103.86%, 86.35%, and 81.06%, respectively (P<0.05). PAM water retainer was more effective in improving maize root vigor and nitrogen uptake, WT water retainer was superior in promoting maize growth and improving water use efficiency, and it was the most effective when water retainer and nitrogen fertilizer were applied at 4‰ and 0.50 g·kg-1, respectively. The results of principal component analysis revealed that the optimal treatment model for improving maize yield and water and nitrogen use efficiency in the arid and semi\|arid regions of northwest China involved the use of PAM water retainer. The highest scores were obtained when the water retainer application rate was 4‰ and the nitrogen fertilizer application rate was 0.50 g·kg-1. |
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