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Interactions between Struvite and Humic Acid and Consequences on Fertilizer Efficiency in a Nonacidic Soil
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2024-09-18 , DOI: 10.1021/acs.jafc.4c05472
Javier Erro 1 , Iñigo Seminario 2 , José M. García-Mina 1
Affiliation  

The effect of humic acid extracted from peat (AHt) on improving the struvite (STR) fertilizing efficiency is explored. To this end, a soil incubation study is correlated to plant assays comparing STR, STR-AHt, and superphosphate (SSP). Characterization techniques confirm the incorporation of the AHt into the STR. The P-pool distribution of STR and SSP is similar in the soil incubation, with STR-AHt presenting a higher labile P at 90 days passing from 10 to 15% P from SSP and STR to 25% P with STR-AHt. However, when applied to barley and tomato, STR yields more shoot P content, aboveground biomass, and residual P in soil than SSP. STR-AHt does not improve the STR results. The poor correlation observed between soil incubation and plant trials highlights the role of the rhizosphere in testing the fertilizer efficiency of STR. Mechanistic assays indicate the key role of rhizosphere pH. Finally, molecular modeling reveals a higher stabilization of STR with AHt, which could reduce P release decreasing the fertilizing potential of STR-AHt, as observed in the pot trials.

中文翻译:


鸟粪石和腐植酸之间的相互作用及其对非酸性土壤肥料效率的影响



探讨了泥炭腐植酸 (AHt) 对提高鸟粪石 (STR) 施肥效率的影响。为此,土壤孵化研究与比较 STR、STR-AHt 和过磷酸钙 (SSP) 的植物测定相关联。表征技术证实了 AHt 掺入 STR 中。STR 和 SSP 的 P 池分布在土壤培养中相似,STR-AHt 在 90 天时表现出更高的不稳定 P,从 SSP 和 STR 的 10% 到 15% 的 P 传递到 STR-AHt 的 25% P。然而,当施用于大麦和番茄时,STR 比 SSP 产生更多的芽 P 含量、地上生物量和土壤中残留的 P。STR-AHt 不会改善 STR 结果。在土壤培养和植物试验之间观察到的不良相关性突出了根际在测试 STR 肥料效率中的作用。机械分析表明根际 pH 值的关键作用。最后,分子模型显示 AHt 对 STR 的稳定性更高,这可以减少 P 的释放,从而降低 STR-AHt 的受精潜力,正如在盆栽试验中观察到的那样。
更新日期:2024-09-18
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