Available sulphur by different extractants in soils of the state of Ceará, Brazil

Sandra Catia Pereira Uchôa, Fernando Felipe Ferreyra Hernández, Valdinar Ferreira Melo, Deyse Cristina Oliveira Silva, Armando José da Silva, Laís de Brito Carvalho


Despite the relevance of sulphur (S) to plant development, studies in Brazil on its availability in the soil are
restricted to a few crops and regions. The aim of this study was to compare extractants for assessing the availability of S, and
establish critical levels for soils in the state of Ceará. In the laboratory, available S was extracted from 23 soils (0 - 0.20 m),
using two extractants: a solution of Ca(H2PO4)2, 500 mg L-1 P in H2O (MCP) and NH4OAc in HOAc (AMA). In an experiment
set up in a greenhouse, forage sorghum ‘EA116’ (Sorghum vulgari Pers.) was used as an indicator plant in two successive crops.
A completely randomised experimental design was employed, in a 23 x 2 factorial scheme with three replications, where the
factors corresponded to the soils and to the doses of S (0 and 80 mg per experimental unit). The MCP was more efficient in
extracting available S than was the AMA, although the S content obtained by both did show a significant correlation (r = 0.96).
The available S using MCP showed a better correlation, with an increase in production and in absorbed S, suggesting MCP to
be the most suitable extractant. The critical levels for S were 3.90 and 3.40 mg dm-3 for MCP and AMA, respectively.


Extraction methods. Critical level. Leaf S content.

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