Qualidade fisiológica de sementes de sorgo sacarino em função da densidade de plantio

Abstract

Because of global concern in obtaining renewable fuel sources through clean processes that reduce dependence on fossil fuel, sweet sorghum (Sorghum bicolor L. Moench) has gained worldwide prominence. For the production of ethanol, has been studying up ways to increase productivity from reducing the crop spacing and an important factor is the quality of seeds used; it is necessary to know both the germination and seed vigor. The work to evaluate the influence of two cultivars planting density on physiological quality of sorghum seed, was developed at Pentecost municipality in Experimental Farm Valley of the Federal University of Ceará Curu. The used sweet sorghum cultivars (BRS 506 and SF-15) were evaluated with row spacings 0.50; 0.60; 0.70 and 0.80 meters, and 0.08between plants; 0.12 and 0.16 meters. The experimental design was a randomized block with four replications in a factorial scheme (2x4x3), two cultivars, four row spacings and three spacing between plants. 3 panicles of the useful area of each plot were collected, and this collection held at 110 days after sowing (DAS) for BRS 506 and 130 DAS to cultivate the SF-15. The panicles collected were taken to the Seed Analysis Laboratory (UFC) where the following analysis was carried out: water content, weight of hundred seeds, number of seeds per panicle, percentage of germination, first count, germination speed index , accelerated aging test and evaluation of the seedlings. It was observed that both cultivars for the arrangement of plants in the field influencing the physiological quality of sorghum seeds. The BRS 506 is recommended for the production of seeds in semiarid condition, so that the recommended spacing is 16 cm between plants and between lines 80 cm, with a density of 75,000 plants per hectare.