Efeito da aplicação de diferentes lâminas de irrigação e doses de nitrogênio e potássio na produção do capim Tanzânia/Effect of different dephts water and doses of nitrogen and potassium in production of Tanzania grass

• Published in: Revista ambiente & água Vol. 10; no. 3; p. 698
• Main Authors: de Oliveira, Ednaldo Miranda, Filho, Jair da Costa Oliveira, de Oliveira, Rubens Alves, de Oliveira, Reginaldo Miranda, Cecon, Paulo Roberto, Cóser, Antônio Carlos
• Format: Journal Article
• Language: Portuguese
• Published: Taubaté Instituto de Pesquisas Ambientais em Bacias Hidrográficas 01-09-2015
• Subjects: Fertilizers; Irrigation; Nitrogen; Pastures; Studies
• ISSN: 1980-993X

The study of the interaction between nitrogen, potassium and water content are important in defining the optimum doses of these factors in order to optimize the production of fodder. Thus, it had as objective in this study was to evaluate the effects of applying different water depths and nitrogen and potassium, in the production of Tanzania grass in southern state of Tocantins. To study the influence of water levels and combinations of N and K^sub 2^O in the grass, the dry and wet periods of the year, it was determined during the experiment forage production. The highest yield in the same period was 8706 kg ha^sup -1^, with the dose of 576.79 kg ha^sup -1^ N: 0.8 K^sub 2^O and water depth of 116% ETc, resulting in an increase of 246%. During the rainy season, the lowest yield was 6815 kg ha^sup -1^, a dose of 100 kg ha^sup -1^ yr^sup -1^ N: 0.8 K^sub 2^O in the absence of irrigation. The highest yield in the same period was 11,710 kg ha^sup -1^, with the estimated dose of 672.9 kg ha^sup -1^ yr^sup -1^ N: 0.8 K^sub 2^O and applied water depth of 120% of ETc, resulting in a increase of 71.8%. It was therefore concluded that work that the maximum dry matter yield estimated to the adjusted model was 20,216 kg ha^sup -1^ yr^sup -1^ obtained with the applied water depth equal to 949 mm and with the application of 630 kg ha^sup -1^ year^sup -1^ of nitrogen and potassium mixture in the ratio of a nitrogen unit for 0.8 potassium units.