Abstract
Soybeans planted in early to mid-June (early) are less affected by rainfall during rainy season than those conventionally planted in early to mid-July in southwestern Japan. Also, narrow row cultivation is expected to increase soybean yield and save labor for inter-tillage and ridging. Field experiments were performed in 2014 and 2015 to test the effect of plant density (high, middle, and low) under early planting condition on growth, yield, and several agronomical traits of Sachiyutaka A1 and three new genotypes (Sakukei 155, Kanto 127 and Shikoku 15). Early planting was performed in mid- to late June, even though rainy season started in early June. Higher plant densities produced 13% greater yield than low plant density through an increase in biomass accumulation, especially at R5. Among yield components, only pods m−2 was significantly and positively correlated with yield, indicating that an increase in pods m−2 led to a greater yield with higher plant densities. The yields of Sachiyutaka A1 were relatively stable for two years, but the lodging resistance should be further improved. Shikoku 15 had greater yield potential and lodging resistance, but its resistance to damping-off disease should be improved. Sakukei 155 with medium plant density produced relatively high and stable yield with less lodging. Although the yield of Kanto 127 fluctuated between experimental years, this genotype showed higher yield potential in higher plant densities with less lodging in 2015. Thus, Sakukei 155 and Kanto 127 with high or medium density may be suitable for early planting in this region.
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Claims 12
Claim · model-written summary
Higher density increased soybean yield by 13% versus low density.
Verbatim
e0“Higher plant densities produced 13% greater yield than low plant density”
Claim · model-written summary
Higher density increased biomass accumulation, especially at R5.
- Taxon
- soybean
Glycine maxt0 - Organ / stage
- R5e0
- Treatment
- Higher plant densitiese1
- Outcome
- biomass accumulatione0
- Direction
- increasee0
- Comparator
- low plant densitye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“through an increase in biomass accumulation, especially at R5”
e1“Higher plant densities produced 13% greater yield than low plant density”
t0“soybean genotypes”
Claim · model-written summary
Pods per square meter was the only yield component significantly positively correlated with yield.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- pods m−2e0
- Outcome
- yielde0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only pods m−2 was significantly and positively correlated with yield”
t0“soybean genotypes”
Claim · model-written summary
Sachiyutaka A1 yield was relatively stable over two years.
Verbatim
e0“The yields of Sachiyutaka A1 were relatively stable for two years”
Claim · model-written summary
Shikoku 15 had greater yield potential and lodging resistance.
- Taxon
- soybeanGlycine maxt0
- Material
- Shikoku 15e0
- Outcome
- yield potential and lodging resistancee0
- Direction
- greatere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shikoku 15 had greater yield potential and lodging resistance”
t0“soybean genotypes”
Claim · model-written summary
Sakukei 155 at medium density produced relatively high and stable yield with less lodging.
- Taxon
- soybeanGlycine maxt0
- Material
- Sakukei 155e0
- Treatment
- medium plant densitye0
- Outcome
- yield with less lodginge0
- Direction
- relatively highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sakukei 155 with medium plant density produced relatively high and stable yield with less lodging.”
t0“soybean genotypes”
Claim · model-written summary
Kanto 127 yield fluctuated across years.
- Taxon
- soybeanGlycine maxt0
- Material
- Kanto 127e0
- Outcome
- yielde0
- Qualifier
- fluctuated between experimental yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the yield of Kanto 127 fluctuated between experimental years”
t0“soybean genotypes”
Claim · model-written summary
Kanto 127 showed higher yield potential at higher density with less lodging in 2015.
- Taxon
- soybeanGlycine maxt0
- Material
- Kanto 127e1
- Treatment
- higher plant densitiese0
- Outcome
- yield potentiale0
- Direction
- highere0
- Qualifier
- less lodging in 2015e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this genotype showed higher yield potential in higher plant densities with less lodging in 2015”
e1“Kanto 127 fluctuated between experimental years”
t0“soybean genotypes”
Claim · model-written summary
The authors recommend improving lodging resistance in Sachiyutaka A1.
Verbatim
e0“the lodging resistance should be further improved”
e1“Sachiyutaka A1 were relatively stable for two years”
Claim · model-written summary
The authors recommend improving damping-off resistance in Shikoku 15.
Verbatim
e0“its resistance to damping-off disease should be improved”
e1“Shikoku 15 had greater yield potential”
Claim · model-written summary
The authors consider Sakukei 155 at high or medium density suitable for early planting.
Verbatim
e0“Sakukei 155 and Kanto 127 with high or medium density may be suitable for early planting in this region.”
Claim · model-written summary
The authors consider Kanto 127 at high or medium density suitable for early planting.
Verbatim
e0“Sakukei 155 and Kanto 127 with high or medium density may be suitable for early planting in this region.”
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