通过长期淹水和添加有机物提高再生铁磷酸盐的磷肥价值

IF 5.2 2区 农林科学 Q1 SOIL SCIENCE
Rochelle Joie SARACANLAO , Hannah VAN RYCKEL , Mieke VERBEECK , Maarten EVERAERT , Erik SMOLDERS
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引用次数: 0

摘要

铁(Fe)矿物通常用于去除废物流中的磷(P),生成含磷的铁(III)氧化物或铁(II)磷酸盐矿物(如 vivianite)。这些矿物在土壤中溶解后可用作肥料,提高磷的循环能力。在此,我们在盆栽试验和培养实验中测试了回收铁磷酸盐(FePs)的磷肥价值,假设在铁(III)还原条件下,FePs 可以释放出磷。首先,对水稻(Oryza sativa)进行了盆栽试验,试验条件包括土壤浸水与否、三种缺钾土壤(酸性、中性和石灰性)以及六种 FePs(三种 Fe(III)Ps 和三种 Fe(II)Ps) 参考三聚磷酸钠(TSP)或零添加。在所有处理中,芽对 TSP 的吸收都有反应,但对 FePs 的吸收反应不大。在盆栽试验中,氧化还原电位在短时间(13 天)内没有因浸水而下降到 -200 mV。进行了更长时间的培养实验(60 d),包括添加谷氨酸盐以刺激还原条件,并用 CaCl2 萃取土壤来评估钾的可用性。谷氨酸的添加和/或更长时间的培养将土壤氧化还原电位降低到 < -100 mV。从长远来看,Fe(III)矿物质释放了钾,石灰性土壤和用 Fe(III)P 污泥改良过的中性土壤中的钾含量充足。由此可以得出结论,延长土壤淹水时间和添加有机物可以提高铁磷酸盐的肥效。此外,施用粉末状的铁磷肥可提高钾的利用率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Increasing phosphorus fertilizer value of recycled iron phosphates by prolonged flooding and organic matter addition

Iron (Fe) minerals are commonly used to remove phosphorus (P) from waste streams, producing P-loaded Fe(III) oxides or Fe(II) phosphate minerals (e.g., vivianite). These minerals may be used as fertilizers to enhance P circularity if solubilized in soil. Here, we tested the P fertilizer value of recycled Fe phosphates (FePs) in a pot trial and in an incubation experiment, hypothesizing that P release from FePs is possible under Fe(III)-reducing conditions. First, a pot trial was set up with rice (Oryza sativa) in all combinations of soil flooding or not, three P-deficient soils (acid, neutral, and calcareous), and six FePs (three Fe(III)Ps and three Fe(II)Ps) referenced to triple superphosphate (TSP) or zero amendments. Shoot P uptake responded to TSP application in all treatments but only marginally to FePs. The redox potential did not decrease to -200 mV by flooding for a brief period (13 d) during the pot trial. A longer incubation experiment (60 d) was performed, including a treatment of glutamate addition to stimulate reductive conditions, and P availability was assessed with CaCl2 extraction of soils. Glutamate addition and/or longer incubation lowered soil redox potential to < -100 mV. On the longer term, Fe(III) minerals released P, and adequate P was reached in the calcareous soil and in the neutral soil amended with Fe(III)P-sludge. It can be concluded that prolonged soil flooding and organic matter addition can enhance the P fertilizer efficiency of FePs. Additionally, application of FeP in powder form may enhance P availability.

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来源期刊
Pedosphere
Pedosphere 环境科学-土壤科学
CiteScore
11.70
自引率
1.80%
发文量
147
审稿时长
5.0 months
期刊介绍: PEDOSPHERE—a peer-reviewed international journal published bimonthly in English—welcomes submissions from scientists around the world under a broad scope of topics relevant to timely, high quality original research findings, especially up-to-date achievements and advances in the entire field of soil science studies dealing with environmental science, ecology, agriculture, bioscience, geoscience, forestry, etc. It publishes mainly original research articles as well as some reviews, mini reviews, short communications and special issues.
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