Sobressemeadura de azevém em pastagens do gênero Cynodon, consorciado ou não com amendoim forrageiro

Abstract

Tropical pastures such as those of the genus Cynodon are gaining prominence in the livestock sector, mainly in dairy farms, due to the high production and nutritional quality. In this way, the winter overwintering on consolidated summer pastures is gaining popularity, mainly in the south of Brazil, using ryegrass (Lolium multiflorum Lam.). Therefore, this work aims to verify the production and botanical and structural composition of ryegrass pastures overgrown in pastures of the genus Cynodon, intercropped or not with forage peanut (Arachis pintoi) in the Southwest region of Paraná. The experiment was carried out at the Universidade Tecnológica Federal do Paraná (UTFPR) Câmpus Dois Vizinhos at UNEPE of milk cattle, in 12 paddocks of 225 m² (15 x 15 m) totaling 2700 m², with a randomized block design, using four treatments distributed in three replicates. The experiment consisted of four treatments: Tifton 85 + ryegrass, Coastcross + ryegrass, Tifton 85 + forage peanuts + ryegrass and Coastcross + forage peanuts + ryegrass. The collected samples were weighed and the botanical composition was determined by the separation of species, for the ryegrass the separation of the structural components was of leaf blade, stem + sheath and dead material, the Cynodons and the peanut were evaluated integrally. The dead material component was high at the beginning of pasture utilization due to cumulative frosts and the tropical species affected by them. The accumulation rate was similar between the four forage systems, being higher at the beginning of the pasture utilization, when ryegrass represented about 90%. There was a difference in the structural components of ryegrass between grazing periods, with a higher leaf participation at the beginning and lower harvesting, which was reversed in the final evaluation period.The botanical composition presented predominantly ryegrass in large quantities, followed by dead material due to the occurrence of frost, Cynodon, forage peanut (when present in the system), and finally of other species.