Perfilhamento dos capins Braúna, Cayana e Sabiá submetidos ao diferimento

Abstract

With the appearance of new cultivars of forage grasses over the years, there is a need to carry out new studies about the development and perpetuity of these plants, which can be understood with the evaluation of the rate of appearance and mortality of tillers. In this sense, the experiment was carried out in the Forage Sector of the Federal University of Uberlândia, in Uberlândia, MG, from January 2022 to June 2022. The grasses of the genus Urochloa sábia, cayana and braúna were submitted to 90 days of deferment. Before and during (beginning, middle and end) of the deferment period, the evaluation of tillering dynamics took place in PVC rings of 30 cm in diameter, where new tillers were marked every 30 days in different colors. Dead tillers were also quantified monthly in these rings. The tiller survival rate (TSoP) of the cultivars during the deferment meddle was higher than the other periods. The highest tiller mortality rate (TMoP) occurred in the final of deferment period. The highest tiller appearance rates (TApP) occurred in the pre and early deferment periods. The lowest tiller population density (DPP) occurred during the pre- deferment period. Tiller population stability index (SI) during pre- deferment and early deferral were greater than 1.0 and were less than 1.0 during the middle and end of deferment period. The braúna grass showed higher DPP and TMoP than the cayana and sabiá grasses. The braúna grass forms denser canopies, with a higher population density of tillers than the sabiá and cayana grasses. Tiller population stability patterns are similar between braúna, cayana and sabiá grasses in the previous period and during the deferment period. Before and during the beginning of deferment period, tillering is more intense. At the end of deferment period, tiller mortality is high and the tiller population stability index is low.