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Coupling phosphorus rate and type enhances maize yield by regulating salt ion homeostasis in coastal saline soil-crop systems

文献类型： 外文期刊

作者： Wu, Shuaibing 1 ; Tian, Xingshuai 1 ; Yu, Botao 2 ; Zhang, Jishi 3 ; Zheng, Huifang 4 ; Miao, Qi 5 ; Ying, Hao 1 ; Cui, Zhenling 1 ;

作者机构： 1.China Agr Univ, Coll Resources & Environm Sci, State Key Lab Nutrient Use & Management, Beijing 100193, Peoples R China

2.Agr & Rural Bur Kenli Dist, Dongying 257500, Shandong, Peoples R China

3.Henan Acad Agr Sci, Inst Plant Nutr Resources & Environm, Zhengzhou 450002, Peoples R China

4.Henan Inst Sci & Technol, Sch Agr, Xinxiang 453003, Henan, Peoples R China

5.Anhui Acad Agr Sci, Soil & Fertilizer Inst, Anhui Prov Key Lab Nutrient Cycling & Arable Land, Hefei 230031, Peoples R China

关键词： Coastal saline soil; Maize; Optimal phosphate rate; Phosphate fertilizer type; Salt ion homeostasis

期刊名称：EUROPEAN JOURNAL OF AGRONOMY （ 影响因子：5.5； 五年影响因子：5.9 ）

ISSN： 1161-0301

年卷期： 2025 年 171 卷

页码：

收录情况： SCI

摘要： Phosphorus (P) management influences maize growth and mitigates salt stress in coastal saline soils, but how to match P rate and type to regulate soil-crop system ion equilibrium for higher yield and its driving mechanism remains unclear. We conducted a six-year field trial (2017-2022) to assess the effects of coupling P rates and types, including single superphosphate (SSP), monoammonium phosphate (MAP) and ammonium polyphosphate (APP), on maize yield, P uptake and P agronomic efficiency (PAE), soil-crop system cation homeostasis, and economic benefits in coastal saline soils. Pooling data from the six-year field trial, grain yield had a linear-plateau relationship with increasing P application rates under the three P types, showing an overall plateau yield of 8.51-9.21 Mg ha-1 at 18.88-22.32 kg P ha-1. At the inflection points level, the water-soluble sodium percentage (WSSP) was 59.9, the sodium adsorption ratio (SAR) was 2.2, and the cation ratio of soil structural stability (CROSS) was 2.5, all significantly lower than those under no P treatments. The corresponding inflection points for maize shoot ion ratios were 24.8 for Ca:Na, 172.4 for K:Na, and 18.2 for Mg:Na. The SSP under optimized P rate reduced WSSP by 12.1-12.9 %, SAR by 19.2-23.3 %, and CROSS by18.3-22.0 % more than the reduction observed for APP and MAP. Also, the SSP under optimized P rate resulted in higher maize shoot Ca:Na ratio (8.6-15.3 %), K:Na ratio (8.1-19.9 %) and Mg:Na ratio (11.1-25.3 %) than the ratios observed for APP and MAP. As a result, the SSP under optimized P rate resulted in higher maize yield (+8.06 %), PAE (+32.4 %), and net income (+18.2 %). This study provides insights into soil-crop system ionic homeostasis considering P rate and type, enhancing our understanding of the mechanisms by which salt ion balance affects crop yield and highlighting the critical role of P management in achieving sustainable agriculture in coastal saline soils.

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