Fornecimento de radiação artificial complementar e seus efeitos no cultivo sem solo do morangueiro

Abstract

The incident solar radiation presents quite variable throughout the day and is in a parable in which the peak solar radiation is obtained close to noon. However, at dawn and at dusk the light intensity falling on the plants is considerably low, reducing the photosynthetic rate. Apart from this factor, the months that permeate the winter period have reduced photoperiod in Earth's position of function in relation to the sun. From these conditions, the aim of this study was to evaluate the vegetative growth of strawberry cultivar "Camarosa" grown without soil under different intensities supplementary artificial radiation. The completely randomized design with five treatments and 6 replicates per treatment, so that these are made of different luminous intensities will be used (100, 200, 300 and 400 µmol m -2 s -1 ), which will be supplied during the morning between 06:00 and 09:00 h afternoon between 16:00 and 18:00, totaling 5 hours daily. The data included the following: chlorophyll a, chlorophyll b, chlorophyll, leaflet area, total leaf area, number of leaflets, the bloom, full bloom and the respective numbers of flowers, plant height, stalk height, production per plant and number of fruits per plant. The evaluated data were submitted to analysis of variance and subsequently made up regression curves for each factor. Under the conditions studied in this work, the higher light intensity levels provide greater content of photosynthetic pigments, number of leaflets and yield per plant.