Paclobutrazol and phenoxaprope-P-ethyl potential as growth regulator in Carpet grass Plus®

Mariana Moreira Melero,Maximiliano Kawahata Pagliarini,Patrick Luan Ferreira Dos Santos,Regina Maria Monteiro De Castilho,Bruno Horschut De Lima,Jéssica Cristina Meira Bezerra

doi:10.1590/2447-536x.v26i3.2202

Mariana Moreira Melero, Maximiliano Kawahata Pagliarini + Show 4 more

Open Access

https://doi.org/10.1590/2447-536x.v26i3.2202

Copy DOI

Abstract

Abstract Mowing is a fundamental management for turfgrass development. However, this operation has a higher cost, requiring alternatives to mechanical handling, such as growth regulators use. Thus, the objective was to evaluate the use of paclobutrazol and phenoxaprope-P-ethyl as growth regulators in Carpet grass Plus®. The experiment was performed in full sun, in the northwest region of São Paulo state, from January to March 2020. The grass used was planted in black plastic containers (50 x 17 cm, with a height of 15 cm, totalling 11 L of volume), previously prepared with a mixture of soil + sand (2:1). The experimental design was completely randomized, consisting of two doses of paclobutrazol (1.0 and 2.0 mL L-1) + control and two doses of phenoxaprope-P-ethyl (6.25 and 12.5 µL L-1) + control. Leaf chlorophyll index, digital image analysis and fresh leaf mass were evaluated. It was observed that for Carpet grass Plus®, there was paclobutrazol effect when used as a growth regulator, with the recommended dose of 2 ml L-1 due to its residual effect up to 35 days in reducing fresh mass, without changing the concentration of leaf chlorophyll and green colour. Phenoxaprope-P-ethyl, on the other hand, had an effect as a growth regulator for the studied species, when used in the dose of 6.25 µL L-1.

Highlights

The objective was to evaluate the use of paclobutrazol and phenoxaprope-P-ethyl as growth regulators in Carpet grass Plus®
It was observed that for Carpet grass Plus®, there was paclobutrazol effect when used as a growth regulator, with the recommended dose of 2 ml L-1 due to its residual effect up to 35 days in reducing fresh mass, without changing the concentration of leaf chlorophyll and green colour
The construction of roads and other works that require earthmoving and with the occurrence of high precipitation rate in short periods may lead to the maximization of problems related to embankments instability (Castro et al, 2015; Souza et al, 2016; Antoniolli, 2019)

Summary

Introduction

The use of grass as a permanent vegetation covering on soil surfaces has been an agricultural practice made for several purposes, which can be landscape, recreational, sporting, ornamental and environmental lawns (Santos et al, 2016, Souza et al, 2016; Oliveira et al, 2018).In order to minimize environmental impacts resulting from human activities and reduce the negative aspect of these activities, which can result in soil modification andV. 26, No 3, 2020 p. 432-439 degradation, earthworks are performed, plant coverings planting, where the use of turf is recommended (Antoniolli, 2019). In Brazil, the species most recommended for this purpose are those that require low maintenance, due to slower growth and have resistance to droughts (Godoy et al, 2012; Souza et al, 2016) such as the native Carpet grass (Axonopus fissifolius). Carpet grass has its origin centre in South America, in southern region of Brazil, where it is known as “Curitibana”. It is characterized by having a stoloniferous growth habit, with broad and hairy leaves, with a bright green colour (Godoy et al, 2012, Dias et al, 2015) and ‘Plus®’ is indicated for projects that include areas in full sun and those with low light (Itograss, 2020). Mowing is necessary, as it avoids dry matter accumulation, contributing to a lower risk of fire and its control, if necessary (Affonso and Freitas, 2003)

Methods

Results

Conclusion