ISHS Acta Horticulturae 191: Symposium on Protected Cultivation of Solanacea in Mild Winter Climates
EFFECTS OF GROWTH REGULATORS FOR FRUIT SETTING ON PEPPER (CAPSICUM ANNUUM L.) PRODUCTION |
| Authors: | Helena L. Silveira, L. Aguiar, A. Leitão, M. Lourdes Taborda |
| Abstract:
Having found in previous work that common auxins like NOAm + 4CPA used to promote fruit setting on tomato were not effective on green pepper, other growth regulators were tested, either for efficacy and fitotoxicity. GA3 10ppm, 20ppm and 50ppm and NOA + 2.4-D (33.7ppm + 1.8ppm), (45ppm + 2.5ppm), (67.5ppm + 3.7ppm) on early and late season crop showed different behaviour using cv. Lamuyo. Applications with NOA + 2.4-D (45ppm + 2.5ppm) were effective only when the balance between low temperatures (T<15°C) and intermediate (15°C<T<25°C) plus high (T>25°C) temperatures during fruit set was favourable to the first ones in a proportion of at least 2 to 1. So, in late crop, only the first two applications produced an increase in crop production, while in early season crop application time could be extended. Gibberellic acid at 10ppm produced some increase in early crop production only when applied in late flowering levels and in late crop production when applied in early flowering levels. In both cases the balance between low (T<15°C) and intermediate (15°C<T<25°C) plus high (T>25°C) temperatures during fruit set was close to one. General applications for fitotoxicity evaluation on pot trials using these two growth regulators didn't affect plant morphology in cv. Lamuyo. Chlorflurenol (5ppm, 10ppm) tested only for fitotoxicity, gave strong malformation of leaves and fruits in cv. Lamuyo, Gedeon, Argo and P. Quadrato Giallo. | |
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