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Ciência e Agrotecnologia

versão impressa ISSN 1413-7054

Resumo

RIBEIRO, Karina Guimarães  e  PEREIRA, Odilon Gomes. Dry matter production and mineral content of tifton 85 bermudagrass on different nitrogen rates and regrowth ages. Ciênc. agrotec. [online]. 2011, vol.35, n.4, pp.811-816. ISSN 1413-7054.  https://doi.org/10.1590/S1413-70542011000400022.

The dry matter production and mineral content of Tifton 85 bermudagrass (Cynodon nlemfüensis x Cynodon dactylon) on nitrogen rates (0, 100, 200, 300 and 400 kg/ha) and regrowth ages (28, 42 and 56 days) were evaluated. The experimental design was completely randomized with a split plot feature. The main plots referred to N-rates whereas subplots were regrowth ages. The forage yield ranged from 5.75 to 20.46, from 8.13 to 22.85 and from 10.52 and 25.23 t/ha of DM, in response to rates of 0 to 400 kg N/ha, in plants harvested at 28, 42 and 56 days of regrowth, respectively, with a response efficiency of 36.8 kg DM/kg N. The P contents decreased with N rates and plant age increased ranged from 0.27 to 0.16%. The K contents decreased as plant age increased; the maximum K content of 1.25, 1.11, and 0.96% were recorded for plant harvest with 28, 42 and 56 days of regrowth, respectively, fertilized with 55 kg N/ha/cutting. The average Ca content was 0.48%. The Mg content increased as N rates increased and decreased as plant age increased, with values between 0.24 and 0.45%.

Palavras-chave : Calcium; nitrogen response efficiency; phosphorus; magnesium; potassium.

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