Efeito dos biorreguladores nos atributos agronômicos em cultivares de soja na região do MATOPIBA

Abstract

Bioestimulants are efficient when applied in low concentrations, stimulating and favouring the vital processes of the plant, with positive consequences on the quality and quantity of production. Some factors must be considered for these answers, such as species, cultivar, plant part, development stage, concentration, interaction of other regulators and environmental factors. Due to these differences, this work aimed to evaluate the agronomic responses of bioregulators in different soybean cultivars. For this, two experiments wtoere carried out: The first experiment was carried out in the municipality of Cariri, Tocantins- Brazil- in the 2019/2020 harvest, where 11 soybean cultivars, eight treatments and four repetitions were tested. Being: T1 – Control, without micro foliar; T2 – 0.5 L ha-1 of Grow soy in V3/V4 + 1.0 L ha-1 of TR in R1/R2; T3 - 1.0 L ha-1 of Grow soy in V3/V4; T4 – 1.0 L ha-1 of Grow soy in V3/V4 + 1.0 L ha-1 of TR in R1/R2; T5 – 1.0 L ha-1 of Grow soy in V3/V4 + 1.0 L ha-1 of TR in R1/R2 + 1.0 L ha-1 of TR in R1/R2 + 15 days; T6 - 2.0 L ha-1 of Grow soy in V3/V4 + 1.0 L ha-1 of TR in R1/R2 + 1.0 L ha-1 of TR in R1/R2 + 15 days; T7 - 0.5 L ha-1 of Stimulate in V3/V4 + 0.5 L ha-1 of Triamin Rac in R1/R2; T8 - 0.25 L ha-1 of Expert Grow in V3/V4 + 0.25 L ha-1 of Expert Grow in R1/R2. The products used were Expert Grow (composed of seaweed extracts and 3.5% potassium nitrate; Triamin Rac (vegetable extract and 6.08% nitrogen), Grow soy (algae extracts and 3% nitrogen, 1% phosphorus, Potassium 1%, Boron 0.01% Molybdenum 0.01% and Zinc 1.4%) and Stimulate (0.005% indolebutyric acid -IBA, 0.009% kinetin, 0.005% gibberellic acid. Yield increased in treatments: T8 for cultivars TMG 2389 and FTR 3178; T7 for cultivar TMG2383; T6 to cultivate C2830; T3 cultivar DOMAIN; T2 to cultivate FTR3178. The treatment 3-1.0 l/ha of Grow soy in V3/V4 was the one that showed the greatest reduction in plant height in the cultivars studied. The weight of a thousand grains was reduced using treatments 2, 3, 4, 5 and 7 for most of the cultivars tested. The second experiment was carried out in the municipality of Aliança, Tocantins- Brazil- with fifteen soybean cultivars and eight treatments with four replications using the same treatment, doses, time and products of the experiment in the municipality of Cariri. It was observed that the cultivars respond differently to the treatments used. The use of bioregulators, application stage and doses should be recommended by observing the cultivar. The thousand-grain weight was the variable with the greatest increase for most treatments.