RENDIMENTO DE GIRASSOL SUBMETIDO A DIFERENTES ESPAÇAMENTOS

Abstract

The sunflower (Helianthus annuus L.) is an annual dicotyledonous plant of the Asteraceae family, native to the North American continent. It is an oleaginous plant that can adapt in different edaphoclimatic conditions, being able to be cultivated in all regions of Brazil. The aim of this study was to evaluate the production components of two different sunflower submitted to different spacing. The experiment was carried out in field conditions from January to May of 2017, in the experimental area of Chã do Jardim, belonging to the Universidade Federal da Paraíba, Areia-PB. The experimental design used was a randomized block design in a 2 x 3 factorial scheme with four replications, the treatments were composed of two different varieties and three spacings (0.3 x 0.7 m, 0.3 x 0.8 m and 0.30 X 0.90 m). The following characteristics were analyzed: days before the first flower, stem diameter, plant heights, diameter of the chapters, mass of a thousand achenes and production of achenes. The data were submitted to the F test and as averages compared by the Tukey test at 5% probability. By the test F only occurred significant effect for characteristic days for the opening of first flower, and when submitted to the Tukey test only the varieties presented the difference related to the opening of first flower, the variety 2 presented higher precocity, and a greater increase in grain yield. The reduction on the spacing between rows without sunflower cultivation had no direct effect on the production components.