Synergistic role of silicon and rapeseed cake in enhancing phosphorus dynamics and nutrient biofortification of rice in acidic soils.

IF 3.5 2区农林科学 Q1 AGRICULTURE, MULTIDISCIPLINARY

Journal of the Science of Food and Agriculture Pub Date : 2026-05-01 Epub Date: 2026-02-23 DOI:10.1002/jsfa.70548

Nader Saad Elsayed, Yinhang Xia, Kai Zhang, Yuxiang Lin, Jiayi Fan, Ola Kh Shalaby, Zhenhua Zhang

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引用次数: 0

Abstract

Background: Rice is a major global staple crop; however, zinc (Zn) and iron (Fe) deficiencies highlight the need to improve its nutritional value. In acidic soils, nutrient imbalances often restrict phosphorus (P) availability, limiting crop productivity. Soil amendments such as rapeseed cake (RC), an organic nutrient source, and silicon (Si), a chemical amendment, are used in rice systems, yet their combined effects on soil P dynamics and nutrient biofortification remain poorly understood.

Results: A two-season field experiment was conducted in Xiangtan, Hunan Province, China, using four treatments: (1) recommended NPK fertilization (control), (2) RC replacing 30% of urea-N, (3) Si applied at 30 kg SiO₂ ha^-1, and (4) combined application of Si and RC (Si + RC). Soil P fractions, grain yield, phytic acid (PA), and Zn bioavailability were assessed. Both Si and Si + RC significantly increased soil Olsen P by 33-47% (from 9.6 to 12.8-14.1 mg kg^-1) across two seasons. The Si + RC treatment increased exchangeable P by up to 48% and organic-bound P by 38-70%, while reducing mineral-bound P by 18-26%. Importantly, Si + RC reduced shoot-to-grain P translocation by 56-70%, decreased grain PA concentration by 20-25%, and lowered the PA/Zn molar ratio from 22 to 12, indicating improved Zn bioavailability.

Conclusions: This short-term field study indicates that RC enhanced sustainability by replacing 30% of urea fertilizer, while the combined application of Si and RC simultaneously enhanced grain biofortification and soil nutrient sustainability in acidic paddy soil. © 2026 Society of Chemical Industry.

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硅和油菜籽饼在酸性土壤中促进水稻磷动态和营养生物强化中的协同作用。

背景：水稻是全球主要的主粮作物；然而，锌（Zn）和铁（Fe）的缺乏突出了提高其营养价值的必要性。在酸性土壤中，养分失衡常常限制磷(P)的有效性，从而限制作物生产力。土壤改良剂，如有机营养源油菜籽饼（RC）和化学改良剂硅（Si），被用于水稻系统中，但它们对土壤P动态和养分生物强化的综合效应仍然知之甚少。结果：在湖南湘潭进行了2季田间试验，采用4种处理：(1)氮磷钾推荐施肥（对照）、(2)RC替代30%尿素氮、(3)Si按30 kg SiO₂ha-1施用、(4)Si与RC联合施用（Si + RC）。评估了土壤磷组分、粮食产量、植酸（PA）和锌的生物有效性。硅和硅+ RC两季土壤奥尔森磷均显著增加33-47%（从9.6 mg kg-1增加到12.8-14.1 mg kg-1）。Si + RC处理可提高48%的交换态磷和38-70%的有机结合态磷，而降低18-26%的矿物结合态磷。重要的是，Si + RC降低了56-70%的茎部到籽粒的磷转运，降低了20-25%的籽粒PA浓度，将PA/Zn摩尔比从22降低到12，表明Zn的生物利用度提高。结论：短期田间研究表明，RC可替代30%的尿素，提高土壤的可持续性，而Si和RC的配施同时提高了酸性水稻土的粮食生物强化和土壤养分可持续性。©2026化学工业协会。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of the Science of Food and Agriculture 工程技术-农业综合

CiteScore

8.10

自引率

4.90%

发文量

634

审稿时长

3.1 months

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