Water management for arsenic mitigation in the second crop of ratoon rice

IF 6.4 1区农林科学 Q1 AGRONOMY

Field Crops Research Pub Date : 2025-08-26 DOI:10.1016/j.fcr.2025.110119

Desheng Yang , Qiyuan Tang , Jianliang Huang , Shaobing Peng

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引用次数: 0

Abstract

Context

Ratoon crop (RC) exhibits a strong arsenic (As) uptake capacity, but the accumulation characteristic and related mitigation strategies remain unclear.

Objective

Identify the decisive growth period for As accumulation of RC and provide irrigation recommendations for reducing As concentration in RC grains.

Methods

Field experiments were conducted in Central China in 2020 and 2021. The entire growth duration of RC was split into three short-term stages according to date of initial heading (IH), full heading (FH), and maturity (MR). Two irrigation methods (flooded and rainfed) were established during each short growing period. A total of eight water treatment combinations were used in this field experiment with a randomized block design. As concentrations in various organs were measured at different periods.

Results

Across water treatments, the As concentration in RC grains ranged from 51.2 to 88.0 µg kg⁻¹ and from 131.8 to 176.5 µg kg⁻¹ in 2020 and 2021, respectively. Non-flooded conditions and cooler temperature during grain filling were associated with reduced grain As concentration. The highest As accumulation occurred from the harvest of main crop (HM) to IH, followed by the IH-FH period. These two growth periods contributed 45.0 % and 34.9 % of final As accumulation during the ratoon season, respectively. Reduced irrigation significantly suppressed As accumulation of RC (p < 0.05). Segmented field drainage implemented during the HM-IH and IH-FH periods reduced the As concentration in RC grains by 18.1 % and 21.4 %, respectively, in comparison with continuous flooding treatment. Moreover, the As concentration in roots was much higher than that in aboveground organs, indicating that As sequestration in roots was an important mechanism to reduce As accumulation in RC grains.

Conclusions

RC plants primarily accumulated As during the growth stage between the harvest of main crop and full heading of RC. Appropriate water drainage practices were shown to effectively reduce As accumulation in RC grains.

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水稻第二季减砷的水管理

玉米作物（RC）表现出很强的砷（As）吸收能力，但积累特征和相关的缓解策略尚不清楚。目的确定水稻籽粒As积累的决定性生育期，为降低水稻籽粒As浓度提供灌溉建议。方法于2020年和2021年在华中地区进行田间试验。按初抽穗、全抽穗和成熟期将整个生育期分为3个短期阶段。在每个短生育期建立两种灌溉方式（水淹灌溉和雨灌灌溉）。本试验采用随机区组设计，共采用8种水处理组合。测定不同时期各脏器的浓度。结果不同水处理下，2020年和2021年RC籽粒As浓度分别为51.2 ~ 88.0 µg kg−1和131.8 ~ 176.5 µg kg−1。灌浆过程中，非淹水条件和较冷的温度与籽粒砷浓度降低有关。主要作物收获至秋收期间砷积累量最高，其次为秋收至秋收期间。这两个生长期对再生季最终As积累的贡献率分别为45.0 %和34.9 %。减少灌溉显著抑制了RC的As积累（p <； 0.05）。与连续注水处理相比，在HM-IH和IH-FH期间进行分段排水，RC颗粒中的As浓度分别降低了18.1% %和21.4% %。根系As浓度远高于地上器官，表明根系As固存是减少籽粒As积累的重要机制。结论红枣植株主要在主粮收获到红枣全抽穗之间的生长期积累砷。适当的排水措施可有效减少RC籽粒中砷的积累。

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

Field Crops Research 农林科学-农艺学

CiteScore

9.60

自引率

12.10%

发文量

307

审稿时长

46 days

期刊介绍： Field Crops Research is an international journal publishing scientific articles on: √ experimental and modelling research at field, farm and landscape levels on temperate and tropical crops and cropping systems, with a focus on crop ecology and physiology, agronomy, and plant genetics and breeding.