Paclobutrazol as growth regulator in Bahiagrass

Abstract

Bahiagrass (Paspalum notatum) is a native species widely found on highways margins, however, cutting practices are necessary, which increase the maintenance cost, being an alternative, the use of growth regulators, such as Paclobutrazol. Thus, the objective of the present study was to evaluate the use of Paclobutrazol doses as growth regulator in Bahiagrass. The turf was implanted in black plastic containers (8.46 L), previously prepared with the mixture of soil + sand + organic compost (1:1:1). The experimental design was completely randomized, composed of 3 doses of Paclobutrazol [1.1 and 2.2 kg a.i. (active ingredient) ha-1 + control (0 kg a.i. ha-1)], in four applications of 2 L of syrup per container, thus forming a factorial 3x4 (doses x response time) with 3 repetitions. The fresh and dry mass, relative chlorophyll index, leaf N and the visual aspect of the green cover rate were evaluated on four different dates. It was observed that the product controlled the growth of the lawn, with less production of fresh and dry mass, and increase of the relative index of chlorophyll and concentration of leaf nitrogen; however, it decreased turfgrass density of green mass, which influenced the visual lawn aspect. Thus, Paclobutrazol controlled Bahiagrass growth at a dose of 2.2 Kg a.i. ha-1 in regular applications of 30 to 45 days, however it affected the density and consequently the aesthetics of the turfgrass.

Paclobutrazol reduces growth and increases chlorophyll indices and gas exchanges of basil (Ocimum basilicum)

“…The effect of reduced transpiration area and more roots absorbing water results in greater plant vigor (Miller, 2016). PBZ can be applied via soil or foliar, however, it is more efficient via soil, as it is translocated almost exclusively by the xylem, where it is absorbed by the roots and taken to the growth points (Xia et al, 2018;Cregg and Ellison-Smith, 2020;Lima et al, 2020;Guimarães et al, 2021).…”

Mefenpyr-diethyl as a safener for haloxyfop-methyl in bahiagrass

“…Therefore, it is mainly used as lawn in low-maintenance areas, such as the sides of highways and industrial areas, in addition to its great importance as forage (Marchi et al, 2016;Souza et al, 2016;Souza et al, 2020). However, bahiagrass grows excessively during Spring and Summer due to heavy rains and high temperatures, thus requiring continuous maintenance, mainly regarding pruning (Lima et al, 2020).…”