Effects of nitrogen fertilizer on carbohydrate and protein fractions in pearl millet (Pennisetum glaucum) cultivars

Wilian H.D. Buso, Aldi F.S. França, Eliane S. Miyagi, Reginaldo N. Ferreira, Daniel S. Corrêa

Abstract


Our research characterizes and quantifies carbohydrate and protein fractions of pearl millet (Pennisetum glaucum) cultivars at different nitrogen (N) rates and 2 sowing dates in Ceres, Goiás, Brazil. A randomized block design using 3 cultivars (ADR-7010, ADR-500 and BRS-1501), 4 N rates (0, 50, 100 and 200 kg N/ha) and 2 sowing dates (December 2010 and February 2011) was employed. Two harvests were undertaken for each sowing date, when plants were 0.70 m high. There were no significant differences among cultivars in either total carbohydrates or A+B1, B2 and C fractions of the carbohydrates. Total carbohydrates and their fractions were not affected by N rate nor sowing date. When protein fractionation was investigated, differences in fraction A were observed among cultivars but not in the B1, B2, B3 and C fractions. Nitrogen rate did not affect protein fractions, but sowing date did affect fractions B2 and B3. The significance of these findings in feeding animals is discussed.

Keywords: Chemical composition, Cornell Net Carbohydrate and Protein System, forage, nitrogen fertilization.

DOI: 10.17138/TGFT(4)47-53

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DOI: https://doi.org/10.17138/tgft(4)47-53

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