Abstract
Gypsum and sulfur have been used as amendments for application in sodic and saline sodic soils, although gypsum is not effective in soil pH reduction. In this study the combined effects of elemental sulfur inoculated with Acidithiobacillus (S*) and gypsum (G) in chemical attributes of a Brazilian solodic soil was evaluated. The treatments consisted in addition of S* and G in various levels (0, 0.8, 1.6, 2.4, and 3.2 t ha−1) and different mixing proportions (100:0, 75:25, 50:50, 25:75, and 100:0), acting during 15, 30, and 45 days. Sulfur inoculated with Acidithiobacillus (S*) markedly reduced soil pH in the leaching solution, especially when applied in the highest levels. Gypsum or sulfur applied individually was not satisfactory for soil reclamation. At 15 days of incubation Na+, Ca2+, and Mg2+ showed higher values in the leaching solution, and a marked decrease was observed in the leaching solution at 30 days. Reduction in soil electrical conductivity and in exchangeable Na+, Ca2+, and Mg2+ was observed and in a general way best results were achieved with S* : G in the ratio 50:50, using 2.4 and 3.2 t ha−1. Sulfur with Acidithiobacillus was more effective than gypsum in decreasing soil pH, and sulfur applied with gypsum in the proportion 50:50 showed the best results in relation to exchangeable sodium and electrical conductivity and showed values below those used for classification as sodic soils.
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Acknowledgements
This work was supported by CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico, Brasil) and FACEPE (Fundação de Apoio a Ciência e Tecnologia do Estado de Pernambuco, Brasil), and also we would like to acknowledge CNPq to the fellowships.
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Stamford, N.P., Ribeiro, M.R., Cunha, K.P.V. et al. Effectiveness of sulfur with Acidithiobacillus and gypsum in chemical attributes of a Brazilian sodic soil. World J Microbiol Biotechnol 23, 1433–1439 (2007). https://doi.org/10.1007/s11274-007-9387-6
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DOI: https://doi.org/10.1007/s11274-007-9387-6