Adubação orgânica e fosfatada na restauração florestal: plantio de Tabebuia cassinoides (Lam.) DC em vasos e no campo

Abstract

The number of native species threatened is a growing threat over the years in Brazil. Tabebuia cassinoides (LAM.) DC. (caixeta), has great economic appeal due to the good workability of its wood, which resulted in the decrease of its population, leading the species to integrate the endangered group. Forest species have different nutritional requirements, so studies involving the determination of adequate doses of organic and mineral fertilizers along with plant responses emerge as an alternative to optimize the recommendation of the amounts of nutrients to be apply. The first chapter of this study aimed to evaluate the effect of organic and phosphate fertilization on the growth and development of T. cassinoides seedlings in pot conditions, as well as the effect of treatments on the chemical attributes of the pot substrate. In the second chapter, the objective was to evaluate the effect of organic and phosphate fertilization on the growth and development of T. cassinoides seedlings, in addition to the survival rate under field conditions. Both experiments were carried out in a completely randomized design over a period of 180 days. Vermicompost (AO), organomineral fertilizer (AOM) and three different doses of reactive natural phosphate (NP) (80P, 40P, 160P) were used as fertilizer sources. These sources of fertilization were compared with treatment in which there was no fertilization (T). Linear growth pattern of seedlings in pots and quadratic in field was observed. It was found that AO stimulates greater growth and development of T. cassinoides in pots and in the field. Phosphate treatments benefit the growth of T. cassinoides seedlings only in the field. Phosphorus availability via reactive natural phosphate increases in soils/substrates with lower pH values, mainly benefiting the stem diameter of T. cassinoides seedlings. In addition, organic fertilization reduces the mortality rate in the field and stimulates the production of reproductive material.