Abstract
The purpose of the study was to evaluate the effect of the Stimulate® plant stimulant, applied to leaves by spraying, on tobacco (Nicotiana tabacum L.) growth and production. The Brasil-Bahia tobacco and Stimulate®, at the doses of 0.0 mL L-1 (control - water); 1.0 mL L-1; 3.0 mL L-1; 5.0 mL L-1; and 11.0 mL L-1, in watery solution, were used. On the fifteenth day after sowing (DAS), the treatments were applied. A total of six sprayings were made, once a day, each five days. After forty-three DAS, the number of leaves; stem and root length; stem, roots, and leaves dry matter; and leaf area were evaluated, under nursery conditions. In the field, the plants remained for 64 days (107 DAS) and the number of leaves; number of viable leaves; plant height; stem and leaves dry matter; and leaf area were evaluated. Stimulate®, under nursery conditions, decreased stem, root and leaf dry matter and leaf area for tobacco. Stimulate® was also efficient to increase the number of leaves and stem length, under nursery conditions, for the Brasil-Bahia tobacco. Under field conditions, Stimulate®, applied during the vegetative stage, was not efficient to increase leaf production, however, it increased stem height and dry matter.
Highlights
A field experiment was carried out with the Pérola and BRS Valente cultivars, aiming to evaluate the efficiency of protective mixtures, in two spraying periods, for controlling angular leaf spot caused by Phaeoisariopsis griseola in common bean, under organic cropping system, in the dry season and under irrigation
Para a cultivar BRS Valente, as caldas bordalesa e sulfocálcica, aplicadas quinzenalmente, proporcionaram acréscimo ao rendimento de grãos de 25,0% e 21,8%, em relação à testemunha, além de apresentarem eficácia de controle de 62% da mancha-angular, propiciando rentabilidade de R$ 573,15 e R$ 464,10 por hectare, respectivamente
Somente a calda bordalesa proporcionou acréscimo significativo ao rendimento de grãos, em relação à testemunha e às demais caldas testadas (Tabela 3), propiciando rentabilidade de R$ 386,40 por hectare, quando aplicada quinzenalmente, embora o intervalo de aplicação não tenha afetado o rendimento de grãos (Tabela 4)
Summary
A field experiment was carried out with the Pérola and BRS Valente cultivars, aiming to evaluate the efficiency of protective mixtures, in two spraying periods, for controlling angular leaf spot caused by Phaeoisariopsis griseola in common bean, under organic cropping system, in the dry season and under irrigation. O objetivo deste trabalho foi avaliar a eficácia de caldas fertiprotetoras, em dois intervalos de aplicação, no controle de mancha-angular causada por Phaeoisariopsis griseola, em sistema orgânico de produção, no período de inverno e sob irrigação por aspersão. Para a cultivar BRS Valente, as caldas bordalesa e sulfocálcica, aplicadas quinzenalmente, proporcionaram acréscimo ao rendimento de grãos de 25,0% e 21,8%, em relação à testemunha, além de apresentarem eficácia de controle de 62% da mancha-angular, propiciando rentabilidade de R$ 573,15 e R$ 464,10 por hectare, respectivamente. Objetivou-se, com este trabalho, avaliar a eficácia da aplicação de caldas fertiprotetoras, em dois intervalos de aplicação, no controle de mancha-angular, em duas cultivares de feijoeiro comum, cultivadas sob irrigação por aspersão, em sistema orgânico
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