Influência da altura de corte em cultivares de aveia

Abstract

White oats (Avena sativa L.) and black oats (Avena strigosa Schreb) are protective soil species due to their coverage rate and dry matter, yield the growth habits of forage plants are of great importance when deciding on the type of grazing to be used. Plants with prostrate growth habit have greater tolerance to trampling and thus may be indicative for continuous grazing systems while plants with more erect growth habits are mainly intended for rotational grazing systems. Thus, cutting heights determine the total amount of dry matter (MS) produced, and the amount recycled in the system. In this perspective, this work aimed to evaluate different cutting heights in oat cultivars with different growth habits. The experiment was conducted in the experimental area of the Federal University of Pampa - Campus Itaqui / RS, in the year 2018. The experimental design was a factorial, consisting of three cultivars IPR Esmeralda (vertical habit), UPFA Moreninha (Intermediate) and IPR Suprema (Semi-prostrate), with five heights and cut residual, being: 10/5, 15/7.5, 20/10, 25/12.5 and 30/15 cm, respectively, in four replications. The evaluated variables were: cut number, green and dry matter. The genotypes IPR Esmeralda, IPR Suprema and UPFA 21 Moreninha, presented a greater number of cuts in treatment (10/5). In the production of green and dry matter the cultivars that presented the best performance were IPR Esmeralda in the treatment (25/ 12,5), followed by the cultivar UPFA 21 Moreninha (25/12,5) and later to cultivar IPR Suprema in the treatment (20/10). Therefore, it is recommended to use the IPR Esmeralda cultivar that has a vertical growth habit with height / cutting residue (25/12,5) for greater efficiency and sustainability of the grazing system.