Variables morfológicas y de composición nutricional en dos cultivares del pasto Megathyrsus maximus, Jacq sometido a una altura y diferentes frecuencias de corte e intensidad lumínica en condiciones de sabanas de Sucre, Colombia

In the Sheets subregion of the department of Sucre, livestock activity takes place mainly in grazing conditions, therefore, the result of the production equation of these systems will be strongly influenced by the type of grass and the management given to it. The objective was to evaluate the effect of the cutoff frequency (25, 35 and 45 days) and light intensity (direct incidence of sunlight and 40% incidence of natural shade from the canopy of Campano P. saman) on morphological variables Guinea grass (M. maximus, Jacq) cv Tanzania cut to 40 cm high and study the degree of association of morphological and nutritional quality of guinea grass cv Tanzania and Mombaza variables, handled 25, 35 and 45 days cutoff frequency and 40 cm in terms of direct impact of sunlight in the subregion Sheets department of Sucre, Colombia. Data of morphological variables obtained from two previous studies in which the effect of the cutoff frequency (25, 35 and 45 days) in the cultivar Tanzania handled in two light conditions (direct impact of sun and 40% evaluated were used shade tree) and the nutritional composition of Tanzania and Mombasa cultivars, made by Cuello, (2014) and Gómez (2014), respectively. The experimental plots were arranged according to a split-plot design, and the data were analyzed considering this type of design, and applying a correlation analysis. It was found that the brightness factor affected the following variables: plant height (p<0,001), height of regrowth (p<0,001), leaf length (p=0,009), leaf width (p=0,012), number of tillers per plant (p<0,001), perimeter of the tiller (p=0,002), diameter of the tiller (p<0,001) and number of green stems (p<0.001). The cutoff frequency affected plant height (p=0,028), height of regrowth (p=0,001), leaf length (p=0,015), number of tillers/plant (p=0,036) and number of green stems/plant (p=0,045); in addition, no significant effect (p>0,050) was found in the interaction between light and cutoff frequency for the variables studied factors. Tanzania to cultivate positive correlation was found between morphological variables width leaf and number of leaves per plant with the content of EE grass; negative correlation between regrowth height, number of green stems per plant, tiller diameter, number of tillers per plant and number of green stems per plant with the FDN, FDA and P pasture. While for farming Mombasa positive correlation between number of tillers per plant, number of green stems per plant, number of tillers per plant, diameter of the tiller, number of dry stalks per plant and number of green stems per plant was found, with ash content and grass FDA; and negative correlation between variables as plant height, height and number of dry regrowth stems P content and MS. In conclusion, Tanzania and Mombasa Guinea grass cultivars can become a forage option to deploy in Savannas condition, as long as they consider, for handling, aspects related to the structure of the plant and defoliation frequency.