Maturity Grouping of Korean Soybean Cultivars and Character Relationships According to the Planting Date

다국어 초록 (Multilingual Abstract)

This study was carried out to classify Korean
soybean varieties base on maturity group (MG) and to find
character relationships according to planting date for high
quality soybean seed production adapted to early season
cultivation environment of Miryang. Results of maturity
grouping of Korean soybean varieties showed that Keunol
(3 cultivars), belonged to Group 0; Seonnok and Danmi in
Group II, Shinrok in Group III, Seonyu (17 cultivars), in
Group IV, Taekwang (44 cultivars) in Group V, Daewon
(25 cultivars) in Group VI, and Kwangdu and Keumdu in
Group VII. Agronomic characteristics of 100 soybean varieties
were compared based on MG, cultivation year and seeding
date. Soybean varieties belonging to the MG VI~VII showed
longer days to flowering and growth period, high lodging
density and higher yield. Seed quality analysis revealed
that as maturity was delayed, seed weight becomes heavier
while seed cracks become abundant. In addition, occurrence
of purple seed and phomopsis were higher in MG
0~III. Protein content was higher in MG 0~III, and isoflavone
content was higher as maturity was delayed. On
the other hand, lipid content was generally similar across
MGs. Correlation analysis of major agronomic characters
showed positive relationships between days to flowering
and growth days, seed weight and lodging in MG IV~V,
seed crack and growth days in MG 0~III, seed crack and
days to flowering in MG IV~V and MG VI~VII, seed crack
and lodging in MG IV~V and MG VI~VII, seed crack and
seed weight in MG IV~V and MG VI~VII, purple seed and
growth days in MG IV~V, purple seed and seed weight in
MG VI~VII, phomopsis and growth days in MG IV~V and
MG VI~VII, and phomopsis and purple seed in MG IV~V
and MG VI~VII . In contrast, a negative relationship was
observed between seed weight and lodging in MG 0~III.
Correlating yield and major characters revealed negative
relationships between days to flowering and growth days
in MG 0~III and MG IV~V, whereas positive relationships
were obtained on MG VI~VII seeded on April 30. Lodging,
seed weight and seed crack were all negatively correlated
with yield in the MG IV~V and MG VI~VII. Soybean
cultivars identified as adaptable to early season planting for
production of high quality soy curd and fermented soybean
paste were Seonyu, Kwangdu, and Soho while those suited
for the manufacture of soybean sprouts were Sobaeknanul,
Kwangan, Sowon, and Bosuk. Geomjeong 2 chosen as best
for mixing with rice.

다국어 초록 (Multilingual Abstract)

This study was carried out to classify Korean
soybean varieties base on maturity group (MG) and to find
character relationships according to planting date for high
quality soybean seed production adapted to early season
cultivation environment of Miryang. Results of maturity
grouping of Korean soybean varieties showed that Keunol
(3 cultivars), belonged to Group 0; Seonnok and Danmi in
Group II, Shinrok in Group III, Seonyu (17 cultivars), in
Group IV, Taekwang (44 cultivars) in Group V, Daewon
(25 cultivars) in Group VI, and Kwangdu and Keumdu in
Group VII. Agronomic characteristics of 100 soybean varieties
were compared based on MG, cultivation year and seeding
date. Soybean varieties belonging to the MG VI~VII showed
longer days to flowering and growth period, high lodging
density and higher yield. Seed quality analysis revealed
that as maturity was delayed, seed weight becomes heavier
while seed cracks become abundant. In addition, occurrence
of purple seed and phomopsis were higher in MG
0~III. Protein content was higher in MG 0~III, and isoflavone
content was higher as maturity was delayed. On
the other hand, lipid content was generally similar across
MGs. Correlation analysis of major agronomic characters
showed positive relationships between days to flowering
and growth days, seed weight and lodging in MG IV~V,
seed crack and growth days in MG 0~III, seed crack and
days to flowering in MG IV~V and MG VI~VII, seed crack
and lodging in MG IV~V and MG VI~VII, seed crack and
seed weight in MG IV~V and MG VI~VII, purple seed and
growth days in MG IV~V, purple seed and seed weight in
MG VI~VII, phomopsis and growth days in MG IV~V and
MG VI~VII, and phomopsis and purple seed in MG IV~V
and MG VI~VII . In contrast, a negative relationship was
observed between seed weight and lodging in MG 0~III.
Correlating yield and major characters revealed negative
relationships between days to flowering and growth days
in MG 0~III and MG IV~V, whereas positive relationships
were obtained on MG VI~VII seeded on April 30. Lodging,
seed weight and seed crack were all negatively correlated
with yield in the MG IV~V and MG VI~VII. Soybean
cultivars identified as adaptable to early season planting for
production of high quality soy curd and fermented soybean
paste were Seonyu, Kwangdu, and Soho while those suited
for the manufacture of soybean sprouts were Sobaeknanul,
Kwangan, Sowon, and Bosuk. Geomjeong 2 chosen as best
for mixing with rice.

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