Impact of fulvic acid and free amino acids on paclobutrazol absorption by ‘Keitt’ mango

Luan Dos Santos Silva,Paula Tereza De Souza E Silva,Ítalo Herbert Lucena Cavalcante

doi:10.4136/ambi-agua.2519

Abstract

This study evaluated the impact of fulvic acid and free amino acids on paclobutrazol soil residue, their absorption and effects on ‘Keitt’ mango grown in tropical semi-arid environmental conditions. The experiment was carried out from 2017 to 2018 simultaneously in two orchards with the same plants and management characteristics, located in Cabrobó, Pernambuco, Brazil. The experimental design was randomized blocks with four treatments, five replications and four plants per replication. The treatments consisted of paclobutrazol combinations with acid fulvic and free amino acids, as follows: Treatment 1: paclobutrazol + water (control); Treatment 2: paclobutrazol + fulvic acids; Treatment 3: paclobutrazol + free amino acids; and Treatment 4: paclobutrazol + fulvic acids + free amino acids. According to the results, the use of fulvic acids, free amino acids or both affects the paclobutrazol absorption by 'Keitt' mango. The addition of fulvic acid to the paclobutrazol improves the absorption of this molecule by the plant, with greater inhibition of vegetative growth of 'Keitt' mango and lower soil residues.

Highlights

The São Francisco Valley, situated in the Brazilian semiarid, presents ideal climatic conditions for growing mangoes, but it must be associated with adequate management practices for soil fertility, irrigation, pruning and the use of plant-growth regulators (Mouco et al, 2010; Santos et al, 2019)
This study evaluated the impact of fulvic acid and free amino acids on paclobutrazol soil residue, their absorption and effects on ‘Keitt’ mango grown in tropical semi-arid environmental conditions
One important mango cultivar for São Francisco Valley is ‘Keitt’, which is grown for exportation and, according to Genú and Pinto (2002), is a very productive plant, with typical growth represented by open and arched branches and leaves facing the base of the branches, promoting an irregular canopy shape

Summary

INTRODUCTION

The São Francisco Valley, situated in the Brazilian semiarid, presents ideal climatic conditions for growing mangoes, but it must be associated with adequate management practices for soil fertility, irrigation, pruning and the use of plant-growth regulators (Mouco et al, 2010; Santos et al, 2019). The use of organic molecules that can increase PBZ absorption and reduce the residue that remains in the soil with its continuous use can improve PBZ absorption efficiency, reduce its dose and, cause less risks to the environment and to the mango industry Among these organic sources, amino acids and their analogues could be used, since they have agricultural applications as complexing substances for higher efficiency of ion and molecule absorption, due to better membrane permeability (Castro and Carvalho, 2014). Amino acids and their analogues could be used, since they have agricultural applications as complexing substances for higher efficiency of ion and molecule absorption, due to better membrane permeability (Castro and Carvalho, 2014) Another organic source with potential use are humic substances (SHs) that induce the H + -ATPase activity that provides energy to the secondary ion carriers and promote nutrient absorption (Canellas et al, 2015), activate ion metabolism and transport of different substances (Jannin et al, 2012).

MATERIAL AND METHODS

RESULTS AND DISCUSSION

CONCLUSION