O experimento foi conduzido em Cáceres, Estado do Mato Grosso, com o objetivo de avaliar o efeito de doses de nitrogênio sobre a produção de forragem e a composição química do capim-tifton 85 (Cynodon spp.). Utilizou-se o delineamento em blocos completos casualizados com cinco tratamentos (0, 60, 120, 180 e 240 kg ha-1 de N) e quatro repetições, em parcelas de 4,0 x 5,0 m. Foram realizados quatro cortes a intervalos de 30 dias, na altura de 5 cm do nível do solo, sendo as doses de N parceladas em quatro aplicações após cada corte, sob a forma de ureia, em cobertura. Foi observado, para cada kg ha-1 de N aplicado, aumento, na produção de matéria seca total de 22,67 kg ha-1, na produção de lâmina foliar verde de 11,37 kg ha-1, na altura do relvado de 0,052 cm e no teor de proteína bruta da forragem de 0,00955 dag kg-1, e diminuição no teor de FDN de 0,0142 dag kg-1. Observou-se aumento na extração de N a uma taxa de 0,537 kg kg-1 de N e diminuição acentuada da eficiência de utilização do N a partir da dose estimada de 155 kg ha-1 de N.

The experiment was carried out in Cáceres, Mato Grosso State, Brazil, aiming to evaluate the effect of nitrogen (N) on forage production and chemical composition of Tifton 85 bermudagrass (Cynodon spp.). A randomized complete block design was used, with five treatments (0, 60, 120, 180 and 240 kg ha-1) and four replications in 4.0 x 5.0 m plots. Four cuts were made at intervals of 30 days, at the height of 5 cm above ground level. N was applied after each cut, in the form of urea. For each kg ha-1 of N applied, we observed increases of 22.67 kg ha-1 in the production of total dry mass, 11.37 kg ha-1 in the production of green leaf blade, 0.052 cm in sward height, and 0.00955 dag kg-1 in crude protein content, and a reduction of 0.0142 dag kg-1 in NDF content. There was an increase in the extraction of N at a rate of 0.537 kg kg-1 of N, and sharp decline in the efficiency of N utilization from the estimated dose of 155 kg ha-1 of N.

The Generalized Integral Transform Technique (GITT) is applied to the solution of the momentum equations in a hydrodynamically developing laminar flow of a non-Newtonian power-law fluid inside a circular duct. A primitive variables formulation is adopted in order to avoid the singularity of the auxiliary eigenvalue problem in terms of Bessel functions at the centerline of the duct when the GITT approach is applied. Results for the velocity field and friction factor-Reynolds number product are computed for different power-law indices, which are tabulated and graphically presented as functions of the dimensionless coordinates. Critical comparisons with previous results in the literature are also performed, in order to validate the numerical codes developed in the present work and to demonstrate the consistency of the final results.