Fontes de fósforo na produção e composição bromatológica de cultivares de milheto forrageiro / Phosphorus sources in production and chemical composition of the peral millet forage

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

The dry matter yield and quality aspects of forage millet are still poorly understood, as well as specific information handled by this grass and nitrogen fertilization. Experiment was conducted to evaluate the productive potential and chemical composition of the dry mass of three cultivars of pearl millet (Pennisetum glaucum (L.) R. Brown) (ADR-7010, ADR- 500 and BRS-1501), submitted to sources of phosphorus (superphosphate and fused), nitrogen (0, 40, 80 and 160 kg ha-) in the form of urea in three cuts in the UFG / Goiânia-GO . The experimental design was completely factorial arrangement 2 x 3 x 4 with four replications. The parameters evaluated were dry matter production (DMP) of the whole plant, while the dry matter (DM), crude protein (CP), acid detergent fiber (ADF) and neutral detergent fiber (NDF) were determined for the whole plant and its fractions (leaf and stem). Only the whole plant was given the apparent conversion efficiency of nitrogen (NACS), apparent nitrogen recovery (NAR) and nitrogen accumulated in the plant (NA) and protein fractions (A, B1, B2, B3 and C). All tests were accomplished using the SAS program (2007). Statistical analysis revealed no significant interactions between the variables studied in this way, these were discussed in isolation. Among the evaluated cultivars the highest yield (P <0.05) was the cultivar ADR-7010 (1175 kg ha-1 DM). The increment of N increases in production. NA increased with the increase of N rates with maximum value of 42.70 kg. The NACS and RAN decreased with the addition of the nutrient, with a peak of 10.77 kg ha-1 and 33.44%. The DM content of whole plant and leaf differed (P <0.05) and stem fraction only differed among genotypes. The CP content of whole plant did not differ (P>0.05), but increased with the succession of cuts. The leaf blade was no difference (P <0.05) reduction of CP in terms of cuts. The CP concentration of stem ranged from 8.90% to 14.04%. ADF whole plant increased due to the succession of cuts and leaf blade varied between the cultivars, the highest contents of ADF were found in the stem. The NDF in the whole plant did not differ between the N levels, however all values were below 60%. The greatest amount recorded in the leaf was 63.81%. The higher NDF were identified in the stem fraction (55.54% to 68.03%). The contents of HEM differ between courts and for all plant cultivars and their fractions. There was no significant difference (P>0.05) for the nitrogen fractions among all treatments. The contents determined for fraction C were all lower than 10%. Cultivar ADR-7010 showed the best results as well as the source superphosphate. The sources of phosphorus and nitrogen fertilization influenced the parameters.

ASSUNTO(S)

potencial produtivo fertilização nitrogenada pearl millet pennisetum glaucum producao animal fracionamento protéico nitrogen fertilization adubação fosfatada phosphorus fertilization protein fractionation

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