BACKGROUND The environmental risk of the application of synthetic chelates has furthered the implementation of biodegradable complexes to correct Mn-deficient plants. This study used the biodegradable ligands of heptagluconate (G7) and gluconate (G6) to test the influence of the Mn2+ :ligand ratio on their fertilisers' capacity to provide Mn to plants. The efficacy of these complexes to correct Mn-deficient soybean was evaluated in hydroponics and calcareous soil conditions and compared with the synthetic chelate EDTA. RESULTS This study demonstrated that G7 was a biodegradable alternative to EDTA for supplying Mn, maintaining an adequate nutritional balance compared with G6, which reduced Fe uptake by the plants. The efficacy of the Mn complexes depended on both the ligand and the Mn:ligand ratio, with the 1:1 and 1:2 molar ratios of Mn2+ :G7 being the most effective complexes in the short term on the basis of their chemical structure and stability. CONCLUSION The Mn2+ :G7 (1:1 and 1:2) complexes were found to be effective Mn sources for plant nutrition due to their chemical structures providing adequate stability in alkaline solution and their fast-action effect. This article is protected by copyright. All rights reserved.

中文翻译：

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锰：配体比例对用七葡糖酸和葡糖酸复合物施肥的 Glycine max L. 植物吸收锰的影响

背景应用合成螯合物的环境风险进一步促进了可生物降解复合物的实施以纠正缺锰植物。本研究使用七葡糖酸盐 (G7) 和葡糖酸盐 (G6) 的可生物降解配体来测试 Mn2+: 配体比例对其肥料向植物提供 Mn 的能力的影响。在水培和钙质土壤条件下评估了这些复合物纠正缺锰大豆的功效，并与合成螯合物 EDTA 进行了比较。结果 本研究表明，G7 是 EDTA 的可生物降解替代品，用于提供 Mn，与 G6 相比保持足够的营养平衡，从而减少植物对 Fe 的吸收。Mn 复合物的功效取决于配体和 Mn:配体比例，Mn2+ 的摩尔比为 1:1 和 1:2：基于其化学结构和稳定性，G7 是短期内最有效的配合物。结论 Mn2+:G7（1:1 和 1:2）复合物被发现是植物营养的有效锰源，因为它们的化学结构在碱性溶液中提供足够的稳定性和快速作用效果。本文受版权保护。版权所有。