Relationships between physical characteristics and quality of soybean seed
1997
Suchart Ondum
Study on relationships between physical characteristics and quality of seed in vegetable soybean KPS 292 and grain soybean i.e. CM 60, NS 1, AGS 129, ST 1, KUSL 20004, SJ 4, SJ 1, SJ 2 and SJ 5 was conducted in early and late rainy season 1994 at Kasetsart University, Kamphaeng Saen Campus. The seeds were subjected to standard germination test, field emergence test, accelerated aging test and electrical conductivity test. The results revealed that the seeds of KPS 292 showed lower quality and deteriorated more rapidly than other varieties. Path-coefficient analyses for the relationships between the physical characteristics of soybean seed and seed quality in early rainy season showed the significant direct effects of percent embryonic axis and eccentricity (seed roundness) on the field emergence test. In late rainy season, percent seed coat and percent embryonic axis demonstrated high direct effects on field emergence test. For the 9 grain soybean varieties, percent embryonic axis and percent seed coat had direct effects on field emergence and seed dry weight had indirect effect through these 2 characters. For late rainy season, percent seed coat, seed density, seed dry weight and percent embryonic axis of the vegetable soybean KPS 292 showed direct effects on field emergence, while other grain soybeans all characters did not show significant effects on field emergence.
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