Tratamentos alternativos na conservação da qualidade de sementes de arroz orgânico durante o armazenamento

Abstract

The organic rice production system is a sustainable alternative that reduces the environmental impact caused by the conventional system and values the product in the market. However, one of the challenges in this system is the conservation of seed quality, since they are susceptible to fungal contamination, making it necessary to search for natural antifungals. Given the above, the objective of this work was to evaluate the quality of organic rice seeds submitted to alternative treatments at different storage temperatures. The experiment was carried out at the Phytotechnic and Grain Classification Laboratories of the Farroupilha Federal Institute, Campus Alegrete. The treatments used were rosemary, basil, biological product, chemical fungicide and control. Samples were stored for 180 days at temperatures of 10, 25 and 40°C and seed quality evaluations were performed at 45, 90, 135 and 180 days. The variables analyzed were germination percentages and first germination count, germination speed index, shoot and root seedling length and dry mass and accelerated aging. During storage, the temperature that showed the best results in general was 40ºC, possibly for breaking the seed dormancy found in the initial analyzes and for providing better development conditions for organic rice seeds. It is concluded that the alternative treatment Basil is indicated to conserve the quality of IRGA 409 organic rice seeds in the municipality of Alegrete, as well as that high storage temperatures provide better development conditions for organic rice seeds.