The objective of this study was to evaluate the morphometric growth and weight gain of strains of tilapia (Thai, Red, UFLA and Commercial) by nonlinear models. Initially, 500 male fingerlings of each strain, at 85 (Red and UFLA) and 86 (Thai and Commercial) days of age, were stocked separately in raceways with 56 m3. Twenty fish of each strain were randomly sampled, weighed and measured monthly. Five nonlinear models (Brody, von Bertalanffy, Gompertz, logistic and exponential) were tested, choosing one […]

Some morphophysiological responses of Brachiaria brizantha cv. Marandu, cv. Piatã, cv. Arapoty, B163, B166 and B. ruziziensis R124 were compared in plants grown in pots, under flooded and well-drained conditions. Flooding reduced leaf elongation rate in all accessions. Leaf dry mass production was lower under flooding than in the control plants in all the studied accessions, except in cv. Piatã. Root dry mass production was reduced by flooding in cv. Marandu and in R124, while the proportion of biomass allocated […]

The canopy growth of Mombaçagrass was assessed under intermittent stocking with three rest periods, characterized by the time required for the expansion of 2.5, 3.5, and 4.5 new leaf blades per tiller, after grazing periods of six days. The experimental area was divided into five or six paddocks per treatment. Five crossbreed (Holstein x Zebu) steers were randomly assigned to each treatment. Extra steers were also used to achieve residual leaf area index of about 2.0, by the end of […]

This research was conducted with the objective of determining growth of Brachiaria brizantha (A. Rich.) Stapf. cv. Marandu under nitrogen (N) rates (28, 112, 210, 294 and 378 mg/L, where N-NO3– : N-NH4+ of 70%:30% proportion was kept constant) and growth ages (21, 28, 35, 42, 49 and 56 days after seedling emergence). The experiment was carried out in greenhouse conditions, with nutrient solution and using ground quartz as substrate. The experimental design used was a complete randomized block design, […]

The objective of this work was to analyze the growth of three cultivars of Panicum maximum: Mombaça, Tanzânia and Vencedor grown in pots, under a transparent plastic cover. The pots were filled with 6 dm3 of redyellow latossol, clayish texture, with high organic matter content. The soil, after sifted, was limed and enriched with N and P, 150 mg/dm3 of each element. The seeds were seeded in the pots, in a total of 54. After thinning, five seedlings were left […]