Qualidade fisiológica de sementes de soja produzidas em três ecorregiões do Paraguai

Abstract

In the last years soybean in Paraguay is becoming the main agricultural product export market with a 70% of the national production shaped grains, which justifies the importance of producing high quality seeds. The objective of this study was to evaluate the physiological quality of soy bean seeds produced in three ecoregions in Paraguay and to determine the most promising regions for the productions of high quality seeds. During the 2008/2009 soybean crop, were collected samples of seeds lots of the cultivars CD 214, A 4910, NM 70 and NA 66 in the South (Itapúa), East (Alto Paraná) and Northeast (Canindeyú). For the analysis of quality parameters were used for germination, first count germination, tetrazolium test (to estimate vigor (TZ 1-3), viability (TZ 1-5), field deterioration, mechanical damage and bug attack (TZ 6 -8)), accelerated aging and emergence of seedlings in field. The results showed that the ecoregions South, East and Northeast of Paraguay have potential for productions of seed lots of soybean lots of the cultivars CD 214, A 4910 and NA 66 the high physiological quality. The damage caused by moisture and mechanical damage is the main factors that contribute to reduced quality of soybean seeds in three ecoregions of Paraguay. The best region to produce soybean seed quality in Paraguay is the region of the Northeast