Abstract
A pot experiment was set to study the effects of N fertilization at different stages on dry matter accumulation and leaf productivity under the same N rate(N50 kg· hm-2). The results showed that compared with other treatments, starter-N plus top dressing N at growth stage R4(N15 kg· hm-2as basal fertilizer and N 35 kg· hm- 2as top dressing) treatment kept vegetative organs in proper size, avoiding either plant self shading or reduction in dry matter accumulation. Dry matter accumulation in this treatment was the highest after grain filling stage, 24.5% higher than N50(N50 kg · hm- 2as basal fertilizer) treatment(P0.01). Top dressing N at R4 delayed leaf senescence, increased net assimilation post grain filling stage and leaf productivity(defined as the amount of dry weight accumulation per unit dry weight of leaves in unit time) of soybean plants. Leaf productivity of N15+35R4 was 165.4% greater than that of N50, and the yield was increased by 30.4%(P0.01).
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Claims 6
Claim · model-written summary
Starter plus R4 top dressing kept soybean vegetative organs at proper size.
- Taxon
- soybean
Glycine maxt0 - Treatment
- starter-N plus top dressing N at growth stage R4e0
- Outcome
- vegetative organs in proper sizee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“starter-N plus top dressing N at growth stage R4(N15 kg· hm-2as basal fertilizer and N 35 kg· hm- 2as top dressing) treatment kept vegetative organs in proper size”
t0“soybean”
Claim · model-written summary
Starter plus R4 top dressing gave highest post grain filling dry matter, 24.5% above basal N50.
- Taxon
- soybeanGlycine maxt0
- Treatment
- starter-N plus top dressing N at growth stage R4e1
- Outcome
- Dry matter accumulatione0
- Direction
- highere0
- Value
- 24.5%e0
- Qualifier
- after grain filling stagee0
- Comparator
- N50e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry matter accumulation in this treatment was the highest after grain filling stage, 24.5% higher than N50(N50 kg · hm- 2as basal fertilizer) treatment(P0.01)”
e1“starter-N plus top dressing N at growth stage R4”
t0“soybean”
Claim · model-written summary
R4 nitrogen top dressing delayed soybean leaf senescence.
- Taxon
- soybeanGlycine maxe1
- Treatment
- Top dressing N at R4e0
- Outcome
- leaf senescencee0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Top dressing N at R4 delayed leaf senescence”
e1“soybean plants”
Claim · model-written summary
R4 nitrogen top dressing increased post grain filling net assimilation.
- Taxon
- soybeanGlycine maxe1
- Treatment
- Top dressing N at R4e0
- Outcome
- net assimilatione0
- Direction
- increasede0
- Qualifier
- post grain filling stagee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Top dressing N at R4 delayed leaf senescence, increased net assimilation post grain filling stage and leaf productivity”
e1“soybean plants”
Claim · model-written summary
N15+35R4 leaf productivity exceeded N50 by 165.4%.
- Taxon
- soybeanGlycine maxt0
- Treatment
- N15+35R4e0
- Outcome
- Leaf productivitye0
- Direction
- greatere0
- Value
- 165.4%e0
- Comparator
- N50e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf productivity of N15+35R4 was 165.4% greater than that of N50”
t0“soybean”
Claim · model-written summary
N15+35R4 increased soybean yield by 30.4%.
- Taxon
- soybeanGlycine maxt0
- Treatment
- N15+35R4e0
- Outcome
- yielde0
- Direction
- increasede0
- Value
- 30.4%e0
- Comparator
- N50e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf productivity of N15+35R4 was 165.4% greater than that of N50, and the yield was increased by 30.4%(P0.01)”
t0“soybean”
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