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Revista Brasileira de Zootecnia

versão impressa ISSN 1516-3598versão On-line ISSN 1806-9290

Resumo

ALVIM, Maurilio José; BOTREL, Milton de Andrade; REZENDE, Humberto  e  XAVIER, Deise Ferreira. Evaluation under grazing of forage potential of Cynodon grass under two nitrogen and potassium levels. R. Bras. Zootec. [online]. 2003, vol.32, n.1, pp.47-54. ISSN 1516-3598.  https://doi.org/10.1590/S1516-35982003000100006.

The study was undertaken in Coronel Pacheco - MG (National Dairy Cattle Reserch Center of the Brazilian Agricultural Corporation - EMBRAPA), to evaluate, under grazing conditions, the Cynodon nlenfuensis, Vanderyst and three cultivars of Cynodon dactylon, L. Pers. (Florona, Florakirk, Florico), fertilized with either 250:200 or 500:400 kg/ha/year of N:K2O. The experimental design was a randomized blocks, in split-plot, and three replications. No significant difference on dry matter yield between the two rates of N/K2O were found. In both N:K2O rates, Florakirk cultivar presented the highest annual dry matter yield, however, in the dry season it showed a low yield level. The Florico was the cultivar with the lowest dry matter yield. The best and the worst forage distribution were exhibited by cultivars Florona and Florakirk, respectively. The CP contents in the forage was not influenced by either nitrogen rates or season, and directly related to the leaf-stem ratio. The highest CP contents were found in Florakirk, while the lowest in african stargrass grass and Florico cultivar. The IVDMD of forage produced during the rainy season was slightly superior to those of the dry season. The N:K2O rates did not influence IVDMD, which were higher in Florakirk and Florona cultivars.

Palavras-chave : Cynodon nlemfuensis; Cynodon dactylon; in vitro dry matter digestibility; dry matter yield; crude protein; leaf-stem ratio.

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