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vol.35 issue4Morphological and productive responses of marandugrass to combined rates of nitrogen and sulphurMorphogenetic and structural traits of italian ryegrass (Lolium multiflorum Lam.) sward managed under different grazing intensities and methods author indexsubject indexarticles search
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Revista Brasileira de Zootecnia

Print version ISSN 1516-3598On-line version ISSN 1806-9290

Abstract

BONFIM-SILVA, Edna Maria  and  MONTEIRO, Francisco Antonio. Nitrogen and sulphur for productive characteristics of signalgrass from degrading pasture area. R. Bras. Zootec. [online]. 2006, vol.35, n.4, pp.1289-1297. ISSN 1516-3598.  http://dx.doi.org/10.1590/S1516-35982006000500006.

The objective of this work was to evaluate the effects of combined rates of N and S on signalgrass (Brachiaria decumbens) productive characteristics. This grass was collected in cylinders with soil + plants in a degrading pasture established in an Entisol. The experiment was carried out in a greenhouse, at Piracicaba, SP, Brazil, from November 2003 to March 2004. Five rates of N (0, 100, 200, 300 and 400 mg/dm3) were combined with five rates of S (0, 10, 20, 30, and 40 mg/dm3) in a fractionated 52 factorial, based on a central composite design. Plants were harvested following three periods of 30 days growth. The combination between N and S rates affected the number of tillers, dry matter yield of leaf blade and stems plus sheaths at the first harvest and the leaf blade: stems plus sheaths ratio at the second harvest. Nitrogen rates had effects on the number of tillers and on dry matter yield of leaf blade and stems plus sheaths at the second and third harvests. At the first growth, the leaf number of the grass was changed by both N and S rates, and by N rates at the second and third growths. Maximum dry matter yields were reached when N and S rates were applied at about 10:1 ratio. The application of mainly N, but also of S, affected the productive characteristics of signalgrass, and its recovery.

Keywords : Brachiaria decumbens; leaves; leaf [stem ratio]; tillers.

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