Effect of harvest frequency and application of amendments on the productivity of Cenchrus clandestinus Hochst. ex Chiov Morrone

Abstract

Objective: To evaluate the effect of harvest frequency and application of lime and organic matter on the forage production, nutritional value and costs of Cenchrus clandestinus Hochst. ex Chiov Morrone.

Materials and Methods: The work was done in three 208-m² blocks, divided into four plots, to which four doses of organic matter (0, 2, 4 and 6 t ha^-1) were applied. Each plot was divided into three subplots, in which three doses of lime (0, 3 and 6 t ha^-1) were used. Afterwards, each subplot was divided into five sub-subplots, in which one of the five harvest frequencies (28, 35, 42, 49, and 56 days) was used. The agronomic response and chemical composition during the rainy and dry seasons were evaluated. In addition, the production cost of the pasture C. clandestinus was calculated. The results were analyzed with a split-plot design.

Results: The harvest frequencies of 35 and 49 days showed higher daily growth rate during the rainy and dry seasons, respectively. However, the harvest frequency did not affect the nutritional values. The application of lime and organic matter did not show an evident effect on the forage production or quality. The 35-day harvest frequency showed lower production cost.

Conclusion: The harvest or grazing of the pasture C. clandestinus is variable, and should not be static throughout the year.