The present work aimed to evaluate the application of plant growth regulators, associate or not to liquid fertilizers, on the ratoon sprouting and productivity of sugarcane genotypes. The experiment was carried out near Jaú city (SP),
Height reduction in soybean plants caused by 2,3,5-triiodobenzoic acid RESUMO O ácido 2,3, Os componentes da produtividade da soja, tais como número de plantas por unidade de área, número de vagens por planta, número de sementes por vagem e massa média de sementes, são determinados por processos fenológicos como germinação, desenvolvimento vegetativo, florescimento, frutificação e maturação. Dentre os diversos fatores que podem afetar essas fases do desenvolvimento das culturas, os hormônios vegetais desempenham um papel importante, podendo uniformizar a germinação, controlar o desenvolvimento vegetativo, aumentar a fixação de flores e frutos e antecipar ou atrasar a maturação.Um dos principais problemas enfrentados pelos produtores de soja é o intenso crescimento vegetativo, que provoca acamamento das plantas, -NOTA -
The aim of this study was to evaluate the effect of isolated and combined applications of gibberellic acid (gibberellin), indolbutyric acid (auxin) and kinetin (cytokinin) on vegetative and reproductive development of tomato test plants (Solanum lycopersicum cv. Micro-Tom), to better elucidate the interactions among these hormonal classes. The following treatments were accomplished through foliar application: GA3 (5 mg L-1); IBA (5 mg L-1); KIN (9 mg L-1); GA3 + IBA (5 mg L-1 + 5 mg L-1); GA3 + KIN (5 mg L-1 + 9 mg L-1); IBA + KIN (5 mg L-1 + 9 mg L-1); GA3 + IBA + KIN (5 mg L-1 + 5 mg L-1 + 9 mg L-1) and Stimulate® (100 mL L-1). Plants from the control were sprayed with water. Stimulate®, is a commercial liquid formulation containing KIN (90 mg L-1), GA3 (50 mg L-1) and IBA (50 mg L-1). We analyzed the shoot dry matter (g), root dry matter (g); fruit fresh matter (g); fruit dry matter (g) and fruit size (cm). The experimental design was completely randomized with nine treatments and fifteen replications. The treatment means were compared by Tukey's test. Some combined applications of GA3, IBA and KIN or Stimulate® promoted significant increases in the dry matter accumulation of roots and fresh and dry matter of fruit compared to the control. Besides the perspective to extend such results for commercial tomato production, the relevance of known hormonal interactions for the results obtained is discussed.
The present work was developed to evaluate the effect on the cluster, berries and raquis characteristics of Niagara Rosada and Venus table grapes of increasing doses of gibberellic acid associated or not with branch girdling and/or cluster blunt. Two experiments, for each cultivar, were accomplished in the northwest area of São Paulo State, Brazil, in a randomized block design, with five replications, being fourteen and eighteen treatments for 'Niagara Rosada' and twenty-eight treatments for 'Venus'. The gibberellic acid in the doses of 0; 10; 22,5; 35; 47,5; 60 and 72,5ppm, was applied, through the total immersion of the clusters, fifteen days after the full flowering, except for the second experiment with 'Niagara Rosada', in which was added up two more doses of 85 and 97,5ppm. The girdling in the productive branches was also accomplished in this same time. In the first experiment with 'Niagara Rosada' no effect of girdling was detected on the berry mass and size. Also, gibberellic acid (35ppm) alone increased cluster and berry mass and size. This same dose when associated with girdling provided increase in the soluble solids. In the second experiment with 'Niagara Rosada', larger increments on berry size and mass, as well as, pedicels diameter were obtained with gibberellic acid (60ppm) associated with branch girdling. The largest increments on cluster mass and width and on the berry number per cluster, were xi obtained applying gibberellic acid (35ppm) associated with girdling. In the first experiment with 'Venus' seedless table grape in 1999 it was detected that the higher the concentrations of gibberellic acid, the larger were berry length, width and the mass. Also, girdling associated or not with cluster blunt increased these same characteristics. In the second experiment with 'Venus' cultivar it was noticed that the higher the concentrations of gibberellic acid, the larger were cluster and raquis length and width. Gibberellic acid (35ppm) associated with girdling only or with cluster blunt provided the largest increase on cluster and raquis masses and the largest berry number per cluster. Larger berries were obtained with gibberellic acid (60ppm) associated with girdling only or with cluster blunt. The largest berry mass was obtained with gibberellic acid (47,5ppm). Also, it was detected a decrease in soluble solids with higher concentrations of the vegetable regulator associated with girdling.
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