Abstract
Abstract Delayed planting consistently reduces grain yields by soybeans [Glycine max (L.) Merr.]. Grain yield of soybeans is thought to be influenced by the duration of seedfill which in turn is influenced by remobilization of N from vegetative tissue. A field study was conducted during two growing seasons in Urbana IL. to evaluate the effect of planting date on N accumulation, partitioning, and remobilization by soybean cultivars ‘Williams 79’ and ‘Corsoy 79’. Soybeans were planted in mid‐May or mid‐June of 1982 and 1983. Tissue samples including abscised material, were collected at R1, R5, R7, and R8 and separated into seeds, pods, stems, leaflets and petioles for N analysis. Kjeldahl plant N prior to seedfill was generally greater in Williams 79 than Corsoy 79; however, the latter stored more N per unit biomass to partially compensate for reductions in total biomass. Cultivar differences in vegetative N were more pronounced with delayed planting. Water stress during 1983 reduced total leaf N levels at R5, and resulted in a reduced rate of N remobilization to the seed. Net N remobilization ranged from 4.5 to 84.0%. Whole plant N accumulation rates during seedfill increased to compensate for reductions in net N remobilization so that total N accumulation by the seed was not greatly reduced by drought. Delayed planting reduced the total N of each vegetative plant part prior to R5 which corresponded to decreases in biomass. Delayed planting also reduced total N transfer to the seed. By R7 treatment differences were reduced.
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Claims 12
Claim · model-written summary
Williams 79 had greater pre-seedfill plant nitrogen than Corsoy 79.
Not reportedTaxon
Verbatim
e0“Kjeldahl plant N prior to seedfill was generally greater in Williams 79 than Corsoy 79”
Claim · model-written summary
Corsoy 79 stored more nitrogen per biomass.
Not reportedTaxon
Verbatim
e0“the latter stored more N per unit biomass to partially compensate for reductions in total biomass”
e1“Williams 79 than Corsoy 79”
Claim · model-written summary
Cultivar differences in vegetative nitrogen were more pronounced after delayed planting.
- Taxon
- soybeans
Glycine maxe1 - Treatment
- delayed plantinge0
- Outcome
- vegetative Ne0
- Direction
- more pronouncede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cultivar differences in vegetative N were more pronounced with delayed planting.”
e1“soybeans [Glycine max (L.) Merr.]”
Claim · model-written summary
Water stress reduced leaf nitrogen at R5.
- Taxon
- soybeansGlycine maxe1
- Organ / stage
- leafe0
- Treatment
- Water stresse0
- Outcome
- total leaf N levelse0
- Direction
- reducede0
- Qualifier
- R5e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress during 1983 reduced total leaf N levels at R5”
e1“soybeans [Glycine max (L.) Merr.]”
Claim · model-written summary
Water stress reduced nitrogen remobilization rate to seed.
- Taxon
- soybeansGlycine maxe2
- Treatment
- Water stresse1
- Outcome
- rate of N remobilization to the seede0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“resulted in a reduced rate of N remobilization to the seed”
e1“Water stress during 1983”
e2“soybeans [Glycine max (L.) Merr.]”
Claim · model-written summary
Net nitrogen remobilization spanned 4.5 to 84.0%.
- Taxon
- soybeansGlycine maxe1
- Outcome
- Net N remobilizatione0
- Value
- 4.5 to 84.0%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Net N remobilization ranged from 4.5 to 84.0%.”
e1“soybeans [Glycine max (L.) Merr.]”
Claim · model-written summary
Whole-plant nitrogen accumulation increased during seedfill to compensate for lower remobilization.
- Taxon
- soybeansGlycine maxe1
- Organ / stage
- seedfille0
- Outcome
- Whole plant N accumulation ratese0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Whole plant N accumulation rates during seedfill increased to compensate for reductions in net N remobilization”
e1“soybeans [Glycine max (L.) Merr.]”
Claim · model-written summary
Seed nitrogen accumulation was not greatly reduced by drought.
- Taxon
- soybeansGlycine maxe1
- Treatment
- droughte0
- Outcome
- total N accumulation by the seede0
- Direction
- not greatly reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“total N accumulation by the seed was not greatly reduced by drought”
e1“soybeans [Glycine max (L.) Merr.]”
Claim · model-written summary
Delayed planting reduced nitrogen in each vegetative part before R5.
- Taxon
- soybeansGlycine maxe1
- Treatment
- Delayed plantinge0
- Outcome
- total N of each vegetative plant parte0
- Direction
- reducede0
- Qualifier
- prior to R5e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Delayed planting reduced the total N of each vegetative plant part prior to R5”
e1“soybeans [Glycine max (L.) Merr.]”
Claim · model-written summary
Delayed planting also reduced biomass.
- Taxon
- soybeansGlycine maxe1
- Treatment
- Delayed plantinge0
- Outcome
- biomasse0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Delayed planting reduced the total N of each vegetative plant part prior to R5 which corresponded to decreases in biomass.”
e1“soybeans [Glycine max (L.) Merr.]”
Claim · model-written summary
Delayed planting reduced nitrogen transfer to seeds.
- Taxon
- soybeansGlycine maxe1
- Treatment
- Delayed plantinge0
- Outcome
- total N transfer to the seede0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Delayed planting also reduced total N transfer to the seed.”
e1“soybeans [Glycine max (L.) Merr.]”
Claim · model-written summary
Treatment differences diminished by R7.
- Taxon
- soybeansGlycine maxe1
- Outcome
- treatment differencese0
- Direction
- reducede0
- Qualifier
- R7e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“By R7 treatment differences were reduced.”
e1“soybeans [Glycine max (L.) Merr.]”
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