Abstract
Abstract: Although accelerated aging is one of the tests most used for evaluation of the physiological quality of soybean seeds, there are few studies that relate it to other physiological tests used for the crop. In this context, the objective of this study was to investigate the relationship of accelerated aging to the results of physiological performance obtained in the vigor tests most frequently used in the soybean quality control system (germination, first count, seedling vigor classification, accelerated aging, electrical conductivity, emergence speed index, final emergence in sand substrate, and field emergence). The experiment was conducted with seeds that had different vigor levels, adopting a completely randomized experimental design with four replications. Pearson simple correlation analysis (r) and simple linear regression analysis at both 1% and 5% probability were conducted on the data. The results showed that the seedling vigor classification test (r = 0.9160) and the field emergence test (r = 0.9198) were those that best correlated with accelerated aging, followed by the germination (r = 0.8690), first count of germination (r = 0.8460), and electrical conductivity (r = 0.8912) tests.
Highlights
Soybean is the agricultural commodity of greatest economic importance in Brazil (Bornhofen et al, 2015), and its crop area is considerably greater than the crop areas of other agricultural crops
Just as observed in this study, Diniz et al (2013), Schuab et al (2006), and Santorum (2011) registered negative values for Pearson correlation between the physiological quality variables and the electrical conductivity test in soybean seeds, indicating that in simple linear association with this variable, increasing values of one variable are associated with decreasing values of the other
This response can be credited to the very nature of the electrical conductivity test, whose essence is to evaluate physiological potential based on the quantity of leachates found in the soaking solution
Summary
Soybean is the agricultural commodity of greatest economic importance in Brazil (Bornhofen et al, 2015), and its crop area is considerably greater than the crop areas of other agricultural crops. In the 2015/2016 crop season, the mean Brazilian vigor index, determined by the tetrazolium test in soybean seeds, reached the level of 81%, a value considered high and superior to that of 77.6% determined in the 2014/2015 crop season This information shows that Brazil produces good quality seeds, but there is a margin to increase the standard of quality since physiologically superior seeds will give rise to commercial fields that are high yielding and have a high commercial standard. This will promote greater competitiveness and gains for the entire production chain (França-Neto et al, 2016; Abdelnoor, 2016). It can only be identified in a consistent manner when the set of attributes of a genetic, physical, physiological, and seed health nature is considered
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