USO DE BIOESTIMULANTES E FITORREGULADORES NA CULTURA DO MORANGUEIRO

Abstract

The use of biostimulants in agriculture has been highlighted over the years and with these, new technologies are researched to reduce production costs, combined with increased productivity and product quality. The use individually or combined with phytoregulators can also be a management practice to increase the strawberries productivity and quality. In this perspective, this work evaluated the combination effect of biostimulants and phytoregulators with hormonal action on production coefficients and postharvest quality of strawberry (Fragaria x ananassa Duch) cv. Portola, cultivated in a protected environment without soil, using an inert substrate and nutrients supplied from a nutrient solution. The experiment was carried out in a randomized block experimental design, 3 blocks, 12 repetitions and 10 treatments related to the application of biostimulants with and without the association of phytoregulators, being: T1 (control, without biostimulant and/or phytoregulators), T2 (Arbolina ®: 80 mg/L – 60 g/ha ), T3 (Arbolina®: 80 mg/L + GA3 50 mg/L), T4 (Arbolina®: 80 mg/L + AS - 1.0 mM + CaCl2 – 0 .4%), T5 (Arbolina®: 80 mg/L + GA3 – 50 mg/L + AS – 1.0 mM + CaCl2 – 0.4%), T6 (GA3 50 mg/L), T7 (AS – 1.0 mM + CaCl2 – 0.4%), T8 (Arbolina® 80 mg/L + GA3 100 mg/L), T9 (GA3 100 mg/L), T10 (Commercial product). Throughout the experiment, production components and strawberry quality were evaluated. Analyzes of chlorophyll a and b content were carried out in the leaves. The results were statistically evaluated through analysis of variance and tests of 5% LSD means with the aid of the R statistic software. Plants treated with the biofertilizer Arbolina® at a dose of 80 mg/L and the product Stimulate® had higher indexes related to production components (NMT: 95.67, PMM: 14.65). The combined presence of phytoregulators with Arbolina® minimized the reduction in the amount of commercial pseudofruits, in addition to having pseudofruits with higher SS/AT ratio values (6.39, 12.96, 7.85, 6.81, 14.07) and larger diameter (32.28, 33.11, 34.54, 31.11, 33.39) with emphasis on the combination (Arbolina®: 80 mg/L + GA3 50 mg/L + AS 1 mM + CaCl2 0.4%). The positive effect of GA3 application on strawberry productivity was not observed. The highest values of firmness were obtained in plants that received GA3, and Arbolina® potentiated the GA3 effect when applied at a concentration of 50 mg L-1 (Arbolina®: 80 mg/L + GA3 50 mg/L).

Keywords: Phytoregulators, biostimulant, biofertilizer, production system, soilless production, AS, Arbolina®, GA3.