Abstract
Nitrogen assimilation during seed filling limits the seed yield in soybean. Seed nitrogen dependence on either redistributed nitrogen or absorbed nitrogen from soil during seed filling shows varietal differences. The objective of this study was to investigate the timing of nitrogen enrichment for effective nitrogen assimilation. Two soybean cultivars Sachiyutaka and Tamahomare were sown in the pots filled with well-washed fine sand. The plants were well watered with nutrient solution containing 100 ppm nitrogen and other nutrient elements before and after the treatment. The treatments were conducted from reproductive stage R1 to R5 or from R5 to R7 by applying the nutrient solution with different nitrogen concentrations. The high nitrogen concentration from R1 to R5 delayed the decline in SPAD value and leaf nitrogen concentration and improved the seed yield performance in Sachiyutaka, whereas stimulated the decline in SPAD value and leaf nitrogen concentration and had no effect on seed yield in Tamahomare. However, high nitrogen concenntration during R5 to R7 delayed the decline in SPAD value and leaf nitrogen concentration and improved the yield performance more significantly in Tamahomare than in Sachiyutaka. The large seed yield increase by nitrogen enrichment during R5 to R7 in Tamahomare could be caused by both the high photosynthetic rate and vigorous nitrogen uptake during seed filling. These results suggested that the most effective timing of nitrogen enrichment during the reproductive growth period to increase seed yield varies with the cultivar due to the difference in the pattern of nitrogen assimilation.
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Claims 8
Claim · model-written summary
High nitrogen from R1 to R5 delayed decline in SPAD value and leaf nitrogen concentration in Sachiyutaka.
- Taxon
- Soybean
Glycine maxt0 - Material
- Sachiyutakae0
- Treatment
- high nitrogen concentration from R1 to R5e0
- Outcome
- SPAD value and leaf nitrogen concentratione0
- Direction
- delayed the declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The high nitrogen concentration from R1 to R5 delayed the decline in SPAD value and leaf nitrogen concentration and improved the seed yield performance in Sachiyutaka”
t0“Soybean”
Claim · model-written summary
High nitrogen from R1 to R5 improved seed yield performance in Sachiyutaka.
- Taxon
- SoybeanGlycine maxt0
- Material
- Sachiyutakae0
- Treatment
- high nitrogen concentration from R1 to R5e0
- Outcome
- seed yield performancee0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The high nitrogen concentration from R1 to R5 delayed the decline in SPAD value and leaf nitrogen concentration and improved the seed yield performance in Sachiyutaka”
t0“Soybean”
Claim · model-written summary
High nitrogen from R1 to R5 stimulated decline in SPAD value and leaf nitrogen concentration in Tamahomare.
- Taxon
- SoybeanGlycine maxt0
- Material
- Tamahomaree0
- Treatment
- high nitrogen concentration from R1 to R5e1
- Outcome
- SPAD value and leaf nitrogen concentratione0
- Direction
- stimulated the declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas stimulated the decline in SPAD value and leaf nitrogen concentration and had no effect on seed yield in Tamahomare”
e1“The high nitrogen concentration from R1 to R5”
t0“Soybean”
Claim · model-written summary
High nitrogen from R1 to R5 had no effect on seed yield in Tamahomare.
- Taxon
- SoybeanGlycine maxt0
- Material
- Tamahomaree0
- Treatment
- high nitrogen concentration from R1 to R5e1
- Outcome
- seed yielde0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas stimulated the decline in SPAD value and leaf nitrogen concentration and had no effect on seed yield in Tamahomare”
e1“The high nitrogen concentration from R1 to R5”
t0“Soybean”
Claim · model-written summary
High nitrogen during R5 to R7 delayed decline in SPAD value and leaf nitrogen concentration in Tamahomare more than Sachiyutaka.
- Taxon
- SoybeanGlycine maxt0
- Material
- Tamahomaree0
- Treatment
- high nitrogen concenntration during R5 to R7e0
- Outcome
- SPAD value and leaf nitrogen concentratione0
- Direction
- delayed the declinee0
- Comparator
- Sachiyutakae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high nitrogen concenntration during R5 to R7 delayed the decline in SPAD value and leaf nitrogen concentration and improved the yield performance more significantly in Tamahomare than in Sachiyutaka”
t0“Soybean”
Claim · model-written summary
High nitrogen during R5 to R7 improved yield performance more significantly in Tamahomare than Sachiyutaka.
- Taxon
- SoybeanGlycine maxt0
- Material
- Tamahomaree0
- Treatment
- high nitrogen concenntration during R5 to R7e0
- Outcome
- yield performancee0
- Direction
- improvede0
- Comparator
- Sachiyutakae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high nitrogen concenntration during R5 to R7 delayed the decline in SPAD value and leaf nitrogen concentration and improved the yield performance more significantly in Tamahomare than in Sachiyutaka”
t0“Soybean”
Claim · model-written summary
The authors attribute the large Tamahomare yield increase under R5 to R7 nitrogen enrichment to high photosynthetic rate and vigorous nitrogen uptake during seed filling.
- Taxon
- SoybeanGlycine maxt0
- Material
- Tamahomaree0
- Treatment
- nitrogen enrichment during R5 to R7e0
- Outcome
- large seed yield increasee0
- Qualifier
- high photosynthetic rate and vigorous nitrogen uptake during seed fillinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The large seed yield increase by nitrogen enrichment during R5 to R7 in Tamahomare could be caused by both the high photosynthetic rate and vigorous nitrogen uptake during seed filling.”
t0“Soybean”
Claim · model-written summary
The most effective nitrogen enrichment timing for increasing seed yield varies by soybean cultivar.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- most effective timing of nitrogen enrichment during the reproductive growth period to increase seed yield varies with the cultivare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the most effective timing of nitrogen enrichment during the reproductive growth period to increase seed yield varies with the cultivar due to the difference in the pattern of nitrogen assimilation”
t0“Soybean”
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