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Efeito do nitrogênio em cobertura na produtividade de girassol, no Estado do Tocantins

2014; Volume: 42; Issue: 3 Linguagem: Inglês

10.15361/1984-5529.2014v42n3p233-241

1984-5529

C. R. de Oliveira, J. L. de Oliveira, Felipe Rodrigues Barbosa, Alex Darío, Stefany Gregory Moura, Hélio Bandeira Barros,

Sesame and Sesamin Research

The objective of this study was to evaluate responses of sunflower hybrids to nitrogen doses during the second crop season of 2013, in the southern region of the state of Tocantins, Brazil.The experiment was conducted in the experimental farm of the Federal University of Tocantins, campus Gurupi.The statistical design was a randomized complete block in a 3 X 5 factorial, with five replications.The first factor was the hybrids 'Helio 250', 'Helio 251', and 'Helio 360 and the second the nitrogen doses of 0, 50, 100, 150, and 200 kg ha -1 .The evaluated agronomic traits were the number of leaves, plant height, height of chapter insertion, stem diameter, chapter diameter, percentage of normal achenes, thousand achenes weight, grain density, number of achenes per chapter, and productivity.Hybrid 'Helio 251' mean performance was superior to that of the other hybrids as to chapter diameter, normal achenes, number of achenes per chapter, and productivity.In all hybrids plant height, chapter insertion height, and stem diameter increased linearly with nitrogen doses.Chapter diameter and normal achenes responded linearly and quadratically to nitrogen doses.Nitrogen fertilization influenced plant height, chapter height, stem diameter, and number of achenes per chapter.Hybrid 'H251' responded adequately to the environmental conditions prevailing in Tocantis state specifically in terms of productivity.