Comparação de duas épocas de semeteira da cultura de girassol

Abstract

The present work has as theme the comparison of two sowing dates in sunflower crop, aiming to identify the sowing time that gives the best response for sunflower production. The work was based on a trial conducted at Estação Agrária do INI A located in Umbeluzi, Boane district, in which two sowing seasons (May and August) and four sunflower varieties were tested, two of which were open-pollinated (Ala and Rekord) and two others (Pan 7392 and 2W 2302), hybrids. Measurements were taken for plant growth indicators (height 30 days after sowing, height at flowering, days to flowering, head diameter at maturity and days to physiological maturity), and for yield indicators (weight of 1000 seeds, oil concentration in seeds, seed yield and oil yield). The results obtained from the test, submitted to analysis of variance. For the indicators that showed statistically significant differences, the DMS test (5%) was used to analyze the difference in the interaction means for the sowing time factor, and the contrast method was used to analyze the difference in the means of the varieties. In the study carried out, the sowing time factor had a significant effect on all indicators measured except for the head diameter at maturity. The variety factor only had a significant effect on plant height at 30 days after sowing, plant height at flowering, days until flowering and days until physiological maturity. The highest seed and oil yields were found in the second sowing season, which allowed us to conclude that the second sowing season (August) is better than the first (May) (TRADUÇÃO NOSSA)