USO DE VITAMINA E SUBSTÂNCIA HÚMICA NA PRODUÇÃO DE MUDAS DE Stryphnodendron adstringens

Abstract

Stryphnodendron adstringens is a plant native to South America, especially in Brazil, with great potential for the recovery of degraded and increase local biodiversity. Stryphnodendron adstringens like other native species show slow growth, which opens space for the use of techniques aimed at optimize plant development. The use of vitamins and humic substance can be an alternative aimed at promoting better development of native species, accelerating its growth. The research aimed to evaluate the effects of applying substances humic acid (SH) and vitamin nicotinamide (NIC) in the development of seedlings Stryphnodendron astringens. The experiment was carried out in a greenhouse at Federal University of Mato Grosso do Sul, Campus Chapadão do Sul, using a randomized block design with six treatments and four replications. The treatments consisted of the isolated and combined application of SH and NIC in different doses, with variables studied: plant height, stem diameter, number of leaves, dry mass of roots, stem and leaves, total chlorophyll, carotenoids and pheophytin. The results indicated that the combination of SH and NIC, especially at doses of 50% and 100%, provided gains significant in several variables, including increase in seedling height, diameter of collection, dry mass of roots and leaves, in addition to higher total chlorophyll and pheophytin content. The application of these substances favored the root and aerial growth of plants, promoting greater photosynthetic efficiency and resistance to environmental stresses. However, high doses, mainly of NIC, impaired development in some variables, such as the number of leaves and the production of carotenoids, indicating that dosage control is crucial to the success of the treatment. The use of humic substances and vitamin nicotinamide in adequate concentrations can be an effective strategy to improve seedling production of S. adstringens, with benefits for both the regeneration of ecosystems and the quality of seedlings used in environmental recovery projects.