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vol.34 issue4Root mass and growth from aruanagrass and tanzaniagrass under nitrogen ratesEffects of forage availability and energy supplementation on herbage accumulation rate and animal yield author indexsubject indexarticles search
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Revista Brasileira de Zootecnia

On-line version ISSN 1806-9290

Abstract

OLIVEIRA, Patrícia Perondi Anchão; TRIVELIN, Paulo Cesar Ocheuze; OLIVEIRA, Wladecir Salles de  and  CORSI, Moacyr. N and S fertilization and recovery of Brachiaria brizantha cv. Marandu pasture on sandy soil. R. Bras. Zootec. [online]. 2005, vol.34, n.4, pp. 1121-1129. ISSN 1806-9290.  http://dx.doi.org/10.1590/S1516-35982005000400005.

An experiment was carried out during two years on Cerrado soil with the objective of evaluating the response of degraded Brachiaria brizantha cv. Marandu pastures to different N and S fertilization doses. Seven treatments, six with different N and S combinations and a control (degraded pasture), were compared in a randomized complete blocks design. The combinations were: 70 kg ha-1 N without sulphur, 140 kg ha-1 N without sulphur, 210 kg ha-1 N without sulphur, 70 kg ha-1 N and 77 kg ha-1 S, 140 kg ha-1 N and 153 kg ha-1 S, 210 kg ha-1 N and 230 kg ha-1 S. Herbage yield response to nitrogen rates was linear, and the best efficiency of nitrogen use was obtained in the second year. The highest herbage yield was associated with higher extraction of N and smaller soil organic matter content. The sulfur extraction was lower than S doses. The N:S ratio as a criterion of the forage mineral nutrition was effective only in the rainy season. There was sulphur accumulation in deeper layers of soil.

Keywords : degradation; fertilizer; urea; ammonium sulfate; ratio N:S; nutrients.

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