Adaptação e produção de trevo encarnado sobressemeado em tifton 85 e sob regime de irrigação em Cerro Largo/RS

Abstract

In pasture-based livestock production systems, the forage species present cycles and peak in production along the crop year, oscillating the forage availability and requiring a planning, especially when it comes to the availability of small areas to the cultivation. In this context, the objective was the evaluation of the adaptation and production of crimson clover (Trifolium incarnatum) overseeded in tifton 85, intercropping with black oat under irrigation regime. The field experimente was conducted in a dairy property in Santa Cruz district, Cerro Largo county in Rio Grande do Sul, Brazil. The delineation is randomized with two-factors arrangement (4x2x4), four forages (tifton 85, intercrop of tifton 85 + crimson clover, tifton 85 + black oat, tifton 85 + crimson clover + black oat), two irrigation schemes (with or without) and four repetitions. The sowings was carried out in proportion of 85 kg/ha to oak (with seeding) and 20 kg/ha to the clover (throwing sowing). The water balance was realized by Penman Monteith method, with data to be ob tained from automatic weather station of South Frontier Federal University – campus Cerro Largo (UFFS) from the state of Rio Grande do Sul, Brazil. The soil moisture will be evaluated by a tensiometer installed in depths of 0,2 m and 0,4 m. The production evaluation was done by direct method with cuttings (2 each parcel) of a 0,25 m 2 from ground square area, when reaches 15-20cm height, of which the dry mass estimated by hothouse method. There was no significant difference in the use of the irrigation system, while overseeded of Trifolium incarnatum, and Avena strigosa, in Tifton 85 represented an increase (participation) in forage production, and the consortium of the three species, and first time was superior to the other treatments and cuts.