Mattiello Edson M, da Silva Rodrigo C, Degryse Fien, Baird Roslyn, Gupta Vadakattu V S R, McLaughlin Michael J
Department of Soil Science, Universidade Federal de Viçosa , Viçosa, Minas Gerais 36570-900, Brazil.
School of Agriculture, Food and Wine, The University of Adelaide , PMB 1, Waite Campus, Glen Osmond, SA 5064, Australia.
J Agric Food Chem. 2017 Feb 15;65(6):1108-1115. doi: 10.1021/acs.jafc.6b04586. Epub 2017 Feb 6.
Acidification by oxidation of elemental sulfur (ES) can solubilize ZnO, providing slow release of both sulfur (S) and zinc (Zn) in soil. For this study, a new granular fertilizer with ES and ZnO was produced and evaluated. The effect of incorporating microorganisms or a carbon source in the granule was also evaluated. Four granulated ES-Zn fertilizers with and without S-oxidizing microorganisms, a commercial ES pastille, ZnSO, and ZnO were applied to the center of Petri dishes containing two contrasting pH soils. Soil pH, CaCl-extractable S and Zn, and remaining ES were evaluated at 30 and 60 days in two soil sections (0-5 and 5-9 mm from the fertilizer application site). A visualization test was performed to evaluate Zn diffusion over time. A significant pH decrease was observed in the acidic soil for all ES-Zn fertilizer treatments and in the alkaline soil for the Acidithiobacillus thiooxidans-inoculated treatment only. In agreement with Zn visualization tests, extractable-Zn concentrations were higher from the point of application in the acidic (62.9 mg dm) compared to the alkaline soil (5.5 mg dm). Elemental S oxidation was greater in the acidic soil (20.9%) than slightly alkaline soil (12%). The ES-Zn granular fertilizers increased S and Zn concentrations in soil and can provide a strategically slow release of nutrients to the soil.
通过元素硫（ES）氧化实现的酸化作用可使氧化锌溶解，从而在土壤中缓慢释放硫（S）和锌（Zn）。在本研究中，制备并评估了一种含ES和ZnO的新型颗粒肥料。还评估了在颗粒中加入微生物或碳源的效果。将四种添加和未添加硫氧化微生物的颗粒状ES-Zn肥料、一种市售ES锭剂、硫酸锌和氧化锌施用于装有两种不同pH值土壤的培养皿中心。在施肥点的两个土壤剖面（0-5毫米和5-9毫米）中，分别在30天和60天时评估土壤pH值、氯化钙可提取的S和Zn以及剩余的ES。进行了可视化测试以评估锌随时间的扩散情况。在所有ES-Zn肥料处理的酸性土壤中以及仅在接种嗜酸氧化硫硫杆菌的碱性土壤中观察到显著的pH值下降。与锌可视化测试结果一致，与碱性土壤（5.5毫克/分米）相比，酸性土壤（62.9毫克/分米）中从施肥点起可提取锌的浓度更高。酸性土壤中元素硫的氧化程度（20.9%）高于微碱性土壤（12%）。ES-Zn颗粒肥料提高了土壤中S和Zn的浓度，并能向土壤中战略性地缓慢释放养分。
