Qualidade fisiológica de sementes de arroz de terras baixas irrigado por aspersão com diferentes lâminas

Abstract

The rice is one of the world's main crops, the base of the food of many countries. Most of the cultivated rice is irrigated by flooding that has high need of water. An alternative to the reduction of water consumption is the use of sprinkler irrigation that can modify physiological seed quality. The objective of this work was to evaluate the physiological quality of lowland rice seed irrigated by sprinkler with different depths. This study was carried out at the Federal University of Pampa (UNIPAMPA), Campus Itaqui. The experimental design was randomized block and split plot design with two cultivars of lowland rice IRGA 417 (early cycle) and IRGA 424 (average cycle), five irrigation levels (0, 50, 100, 150, and 200% crop evapotranspiration) in sprinkler irrigation system and four replications. We installed the following tests to evaluate the physiological quality of seeds, germination tests, vigor (first count), shoot and radicle length and seedling dry mass. For the variables vigor and germination did not differ between the blades 100, 150 and 200% of crop evapotranspiration (ETC) in the cultivar IRGA 424. For the cultivar IRGA 417 the highest values were found in the blade 150 for germination and 100% and 150% for force and did not differ significantly from the blade of 200%. The cultivars of lowland rice IRGA 417 and IRGA 424 did not produce seeds without irrigation. As the seed marketing legislation for the irrigation of 50% of crop evapotranspiration should not be used for seed production, because it has less than 80% germination. For the cultivars IRGA 417 and IRGA 424 was not increased by seed quality from the blade of 150% and 100% of crop evapotranspiration respectively.