Embrapa Milho e Sorgo, Rodovia MG-424, Km 45, Caixa Postal 285, 35701-970 Sete Lagoas, MG, Brazil.
Universidade de São João Del Rey, Departamento de Ciências Agrárias/DCIAG, Rua Sétimo Moreira Martins, 188, Itapoã, Caixa Postal 56, 35702-031 Sete Lagoas, MG, Brazil.
An Acad Bras Cienc. 2021 Aug 13;93(3):e20201614. doi: 10.1590/0001-3765202120201614. eCollection 2021.
Magnesium is one of the essential elements for the plant growth. However, when the supply of magnesium is required exclusively, few economically feasible options are available. Serpentinite represents an alternative source of magnesium, although little is known about its potential and efficiency under tropical soil conditions. This work aimed to evaluate the use of serpentinite as a soil remineralizer, as well as magnesium fertilizer. The study was conducted in a greenhouse, using a completely randomized design, with seven treatments and four replications, as follows: three levels of serpentinite, mix of serpentinite and phonolite, and the controls with dolomitic limestone and without fertilization. Two plant species (Zea mays L. corn hybrid BRS - 1055 and Phaseolus vulgaris L. common bean variety BRS - Estilo) and two contrasting soils (clayey and sandy texture), were used in pots. Results showed that serpentinite's free silica and toxic element contents fitted the legal requirements. No statistically significant difference was observed for the plant dry matter weight production in the serpentinite and dolomitic limestone control, as well as in the pure serpentinite and the mix with phonolite treatments. The serpentinite was able to supply and to fullfil magnesium requirements for growth and development of corn and bean plants.
镁是植物生长的必需元素之一。然而，当仅需要供应镁时，几乎没有经济可行的选择。蛇纹岩是镁的另一种来源，尽管在热带土壤条件下，其潜在用途和效率知之甚少。本研究旨在评估蛇纹岩作为土壤再生剂和镁肥的用途。该研究在温室中进行，采用完全随机设计，设有 7 个处理和 4 个重复，如下所示：蛇纹岩 3 个水平，蛇纹岩和响岩的混合物，以及用白云石石灰和不施肥作对照。在盆中使用了两种植物物种（玉米杂交种 BRS - 1055 和普通菜豆品种 BRS - Estilo）和两种对比土壤（粘壤土和沙壤土）。结果表明，蛇纹岩的游离二氧化硅和有毒元素含量符合法定要求。在蛇纹岩和白云石石灰对照以及纯蛇纹岩和响岩混合物处理中，植物干物质重量的生产没有统计学上的显著差异。蛇纹岩能够为玉米和菜豆的生长和发育提供并满足镁的需求。
