Propriedades físicas de grãos de girassol (Helianthus annus L.).

Abstract

The knowledge of the physical properties of the grains is necessary for the sizing of machines and equipment. Of this form, this work aimed at the study of the physical properties of the sunflower grains (Helianthus annus L.) in different moisture contents. Two varieties of sunflower had been analyzed: Multissol and Nutrissol and cultivating M734. The sunflower grains had been humidify until reaching moisture contents of 20, 18, 16 and 14 % b.u. and, then after, had been determined the size and the form, bulk desity and mass of a thousand grains. One concluded that: 1. Decrease in the dimensions (length, width, thickness) of the grains of sunflower with the reduction of the moisture contents occurred; 2. The bulk density is inversely proportional to the moisture contents; 3. The sphericity and the mass of a thousand grains are directly proportional to the moisture contents.