Perfilhamento dos capins Marandu, Mavuno, Mulato II e Ipyporã submetidos ao diferimento

Abstract

Studies on how recently launched grass tillering occurs are scarce under deferred conditions. However, knowledge of the changes in the rates of appearance (Tapp) and tiller mortality (Tmop) allows a better understanding of the mechanisms involved in pasture stability and longevity. In this sense, the objective of this study was to compare the tillering patterns of the grasses Marandu, Mavuno, Mulato II and Ipyporã before and during the deferral period. The experiment was conducted from September 2020 to June 2021, in the area of the Experimental Farm Capim Branco, in Uberlândia, MG. The dynamics of basal tillering was evaluated in two areas of 0.07 m2 per plot. The experiment was conducted in a completely casualised design, with repeated measurements over time and with four repetitions. .Tsop was higher in the pre-deferral periods and at the beginning of the deferral period (PD), intermediate in the middle of the PD and lower at the end of the PD. The number of tillers (NP) was higher in the periods of beginning, middle and end of PD, and lower in the pre-deferral. During the pre-deferral and early PD periods, EI>1 was recorded, but the EI decreased over the two other PD periods, recording stability issue (IE)<1 values.Tapp generally decreased over the evaluation period, with higher values recorded in the pre-deferral. Tmop recorded a higher value in the middle and the end of the PD than before these periods. The balance between appearance and mortality (BAL) was negative during the middle and end of the deferral. By contrast, this balance sheet was positive before and at the beginning of the deferral period. The grass-ipyporã tilled more in the pre-forbearance period, presenting higher Tapp. The grass mavuno presented higher Tmop in the middle of the PD. Overall, there were not many differences in tillering dynamics between the evaluated grasses.The appearance, survival and stability of the tiller population of the grasses Marandu, Mavuno, Mulato II and Ipyporã are greater before the deferral period and reduce during this period.