Resfriamento e armazenamento de sementes de soja: interações com a qualidade fisiológica

Abstract

The objective of the present work was to evaluate the physiological quality of soybean seeds submitted to cooling at the moment of the bagging and kept refrigerated in controlled temperature storage or not. The storage was carried out in one cold storege place and another no. It was used soybean seeds, variety M 9144RR, produced in the harvest at Uniggel Seeds, located at ROD TO 255, Lagoa da Confusão - TO. During processing and bagging, the lots were subdivided into sub-lots, to compose the experimental material to be used in each of the cooling and storage forms of the seeds. In the experiment was used 4 forms of storage, so-called: 1) seed lots cooled dynamically and conditioned in an air-conditioned warehouse (R, C); 2): seed lots dynamically cooled and packed in non-heated storage (R, NC); 3): seed lots were not dynamically cooled and packaged in air-conditioned storage (NR, C); 4): lots of seeds not dynamically cooled and stored in an unheated warehouse (NR, NC). During storage, an air temperature and moisture relative was monitored, to a set mass temperature. Seeds germination, tetrazolium (viability and vigor), and emergence of seedlings in the seedbed were submitted to seeds. The samples were collected in six seasons (0, 45, 90 and 135 days). The complete and fully automated experimental design, in 2 x 2x4 (two cooling procedures, two storage conditions and four epochs of evaluation). It was concluded that the artificial cooling at 13ºC without bagging followed by maintenance in cold storage under a temperature of 20ºC ensuring a physiological quality of soybean seeds for 135 days. A germination of the seeds subjected to dynamic cooling and maintained during storage under controlled or non-ambient conditions. It is possible to note the importance of the device "Coolseeds" in maintaining the seed quality during the storage.