Growth and development of seedlings barauna (Schinopsis brasiliensis Engl.) in different shadow levels
Keywords:
forest species, shadingAbstract
Baraúna (Schinopsis brasiliensis Engl.), is a typical species of the caatinga, considered in immediate danger of extinction, studies of techniques that assist in the multiplication of this species in forest nurseries are necessary. Little is known about its physiological behavior under shading conditions. The objective was to evaluate the physiological behavior and initial development of plants of Schinopsis brasiliensis Engl. under different levels of shading. The experiment was carried out at the Plant Ecology Laboratory of the Department of Phytotechnics and Environmental Sciences, at the Center for Agricultural Sciences, at the Federal University of Paraíba. The experimental design was a randomized block with 5 treatments (40%, 50%, 65%, 70% shading and full sun) and 10 repetitions. The height of the stem and the number of leaves were evaluated every thirty days. Dry mass weight (leaf, stem, root and total), chlorophyll content and fluorescence emission were determined. Plants grown under 40% shade had higher height, number of leaves and higher values of dry leaf, root and total dry matter. A higher chlorophyll a / b ratio was found in plants at 70% shade, but the one who showed the most efficiency in the use of light energy was the treatment of 40% shade.
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