________________________________________________________________________________ ResumoObjetivou-se verificar a influência de doses de boro (B) sobre a disponibilidade de boro no solo e características do girassol em Tangará da Serra -MT. O delineamento em blocos casualizados com quatro repetições, seis doses de B (0; 0,5; 1,0; 1,5; 2,0 e 4,0 kg ha -1 de B), utilizando-se o ácido bórico. Avaliaram-se teor de B no solo, concentração foliar de B, diâmetro de caule, altura de plantas, diâmetro de capítulo, massa de 1.000 aquênios, massa seca da parte aérea e produtividade. Todas as características foram influenciadas. A dose de 4 kg ha -1 proporcionou toxidade às plantas com efeitos negativos em diâmetro de caule e massa seca da parte aérea. Palavras-chave: Helianthus annuus L., ácido bórico, produtividade, concentração de nutrientes AbstractThe objective of this study was to verify the influence of boron (B) doses on soil boron availability and sunflower characteristics in Tangará da Serra -MT. A randomized block design with four replicates, six doses of B (0; 0,5; 1,0; 1,5; 2,0 and 4,0 kg ha -1 of B) was used, using boric acid. B content in soil, leaf B concentration, stem diameter, plant height, leaf diameter, mass of 1,000 achenes, shoot dry mass and yield were evaluated. All characteristics were influenced. The dose of 4 kg ha -1 provided toxicity to plants with negative effects on shoot diameter and shoot dry mass.
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