Resumo

TYSKO, Mónica Beatriz  e  RODRIGUEZ, Mónica Beatriz. Response of the double crop wheat-soybean to elemental sulfur fertilization. Cienc. suelo [online]. 2006, vol.24, n.2, pp.139-146. ISSN 1850-2067.

The evidence of S deficiencies in soil and the diffusion of the double crop wheat-soybean motivated the optimization of fertilization strategies. One of them is the S applications to wheat expecting a residual effect in the following soybean crop. In this context, a non-conventional sulfur source, the pretreated micronized elemental sulfur (PES) seems to be an appropriate alternative. The objective of this work was to determine the response of wheat to S fertilization and the effect of the residual S to the following soybean. Five field experiments on Molisolls were developed in Buenos Aires and Santa Fe provinces. The treatments were: 0, 24 and 40 kg S ha^-1 applied as PES on wheat sowing time. At physiological maturity of both crops, yields and the S-SO₄⁼ soil level were determined. Significant response of wheat to SEP application was observed in 3 sites while no differences between treatments were detected in soybean. The wheat response indicated that the availability of PES was faster than usual for elemental sources of S. In soybean, instead, the availability of S to the crop from both soil mineralization and PES application was high enough to satisfy the requirements. We concluded that PES is a suitable source of S to wheat while its application in soybean will depend on the availability of S from mineralization of the soil organic matter.

Palavras-chave : Sulfur fertilization; Residual sulfur; Sulfur sources; Solubility; Yields.

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