Adubação boratada na cultura do crambe em Latossolos

Abstract

Crambe culture is emerging in the energy stage as a source of raw material for biodiesel production where the shortage of technical information related to culture hinders largescale production and therefore the consolidation of crambe in the energy stage. Therefore, this study is aimed at evaluating boron fertilization on crambe crop in two Latosols. The experiment was conducted in a greenhouse belonging to the Agronomic Institute of Paraná, in Santa Tereza do Oeste - PR. The treatments were arranged in a 2x3 factorial project in two soils with different textures (clayish and medium texture) and three doses of B (0, 1 and 8 mg kg-1) applied to the soil. The experimental design had randomized blocks with five repetitions. The experimental unit consisted of a vase containing 2.0 kg of soil with two crambe plants. We evaluated the plant height, dry matter production of roots, stem and fruits, number of fruits per plant, number of branches per plant, weight of one hundred grains and the leaf B content. The texture of the soil did not affect any variable evaluated. There was no significant interaction between the B doses applied and the soil texture. The plant height, number of branches per plant and dry mass of one hundred fruits were not affected by the boron fertilization. The number of fruits per plant and dry matter production of roots, stems and fruits were higher with the use of 1 mg kg-1 B in the soil. The higher the dose of B, the greater were the levels of this micronutrient in crambe leaves. The application of 8 mg kg-1 B caused visible toxicity symptoms in the crambe leaves.