Abstract
Productivity and nutritional quality of Tobiata grass as a function of NPK fertilization. The present study had as objective to study five N rates (0, 50, 100, 150 and 200 kg ha -1 ), two P2O5 rates (96 and 30 kg ha -1 ) as superphosphate triple, and two doses of K2O (170 and 143 kg ha -1 ) as potassium chloride, in the forage Panicum maximum cv. Tobiata, with irrigation. The experiment was conducted using a randomized blocks design with four replicates. In the implantation of the experiment, P and K were applied based on theoretical doses required to reach values of 40 mg dm -3 of P and K 5% of CTC. After three cuts, dry mass produced by the forage was estimated in order to obtain the values of the nutrients exported by the plant. Only after this procedure did the application of the doses of N take place. The production of dry mass - DM, crude protein - CP, neutral-detergent fiber - NDF, and acid-detergent fiber - ADF, were influenced by cuts; increasing N fertilization increased the production of DM, CP and decreased ADF and NDF, providing better forage quality. The fertilization with phosphorus and potassium can be done based on DM production or P and K content in soil.
Highlights
As pastagens brasileiras são cultivadas em diversas áreas e estão sujeitas às variações de temperatura, radiação solar, índice pluviométrico e fertilidade do solo
A produtividade, na maioria das gramíneas tropicais, diminui quando algum desses fatores se torna limitante
Na Tabela 1, encontram-se as médias gerais, significância e coeficientes de variação referentes à produtividade de massa seca (MS), proteína bruta (PB), fibra em detergente neutro (FDN) e fibra em detergente ácido (FDA), para os três cortes do capim-Tobiatã
Summary
As pastagens brasileiras são cultivadas em diversas áreas e estão sujeitas às variações de temperatura, radiação solar, índice pluviométrico e fertilidade do solo. Após a coleta das amostras, a bordadura e o restante de cada parcela foram cortadas com roçadeira costal, e o material vegetal retirado da área; realizou-se a adubação nitrogenada após cada corte, de acordo com os tratamentos.
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