Abstract
Abstract Field studies were conducted in 1985 and 1986 to evaluate the effects of final irrigation timing on spring pea ( Pisum sativum L. cv. Mars) seed yield, percent germination, and distribution of yield within the canopy. Final irrigations were applied on 10 dates during the period from 10% bloom to early senescence. Total seed yield did not increase with irrigations applied past 237 degree-days (base 4.5°C) after bloom (DDAB) in 1985 or 366 DDAB in 1986. However, the highest germination percentages and viable seed yields in 1985 and 1986 were obtained when final irrigations were applied at 487 and 450 DDAB, respectively. In 1986, total seed yield, percent germination, and viable seed yield throughout the canopy increased when the final irrigation was applied at 366 or 588 DDAB compared to earlier final irrigations. Viable seed yield reductions for the early irrigation cut-off dates resulted primarily from reduced numbers of pods per plant, and seeds per pod in the upper canopy (nodes 14 to 17) and decreased germination of seed produced throughout the canopy. We conclude that application of the final irrigation at ≈450 to 500 DDAB (usually 2 weeks after final pod set) should produce viable seed yields similar to those obtained with continued irrigation through early senescence.
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Claims 10
Claim · model-written summary
Later final irrigation did not increase total seed yield past 237 DDAB in 1985.
- Taxon
- spring pea
Lathyrus oleraceust0 - Treatment
- irrigations applied past 237 degree-days (base 4.5°C) after bloom (DDAB)e0
- Outcome
- Total seed yielde0
- Direction
- did not increasee0
- Value
- 237 degree-dayse0
- Qualifier
- in 1985e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total seed yield did not increase with irrigations applied past 237 degree-days (base 4.5°C) after bloom (DDAB) in 1985”
t0“Spring Pea”
Claim · model-written summary
Later final irrigation did not increase total seed yield past 366 DDAB in 1986.
- Taxon
- spring peaLathyrus oleraceust0
- Treatment
- 366 DDABe0
- Outcome
- Total seed yielde1
- Direction
- did not increasee1
- Qualifier
- in 1986e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“or 366 DDAB in 1986”
t0“Spring Pea”
e1“Total seed yield did not increase with irrigations applied past 237 degree-days (base 4.5°C) after bloom (DDAB) in 1985 or 366 DDAB in 1986”
Claim · model-written summary
Final irrigation at 487 DDAB gave the highest germination percentage in 1985.
- Taxon
- spring peaLathyrus oleraceust0
- Treatment
- final irrigations were applied at 487e0
- Outcome
- germination percentagese0
- Direction
- higheste0
- Value
- 487e0
- Qualifier
- in 1985e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest germination percentages and viable seed yields in 1985 and 1986 were obtained when final irrigations were applied at 487 and 450 DDAB, respectively”
t0“Spring Pea”
Claim · model-written summary
Final irrigation at 487 DDAB gave the highest viable seed yield in 1985.
- Taxon
- spring peaLathyrus oleraceust0
- Treatment
- final irrigations were applied at 487e0
- Outcome
- viable seed yieldse0
- Direction
- higheste0
- Value
- 487e0
- Qualifier
- in 1985e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest germination percentages and viable seed yields in 1985 and 1986 were obtained when final irrigations were applied at 487 and 450 DDAB, respectively”
t0“Spring Pea”
Claim · model-written summary
Final irrigation at 450 DDAB gave the highest germination percentage in 1986.
- Taxon
- spring peaLathyrus oleraceust0
- Treatment
- final irrigations were applied at 487 and 450 DDABe0
- Outcome
- germination percentagese0
- Direction
- higheste0
- Value
- 450 DDABe0
- Qualifier
- in 1986e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest germination percentages and viable seed yields in 1985 and 1986 were obtained when final irrigations were applied at 487 and 450 DDAB, respectively”
t0“Spring Pea”
e1“or 366 DDAB in 1986”
Claim · model-written summary
Final irrigation at 450 DDAB gave the highest viable seed yield in 1986.
- Taxon
- spring peaLathyrus oleraceust0
- Treatment
- final irrigations were applied at 487 and 450 DDABe0
- Outcome
- viable seed yieldse0
- Direction
- higheste0
- Value
- 450 DDABe0
- Qualifier
- in 1986e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest germination percentages and viable seed yields in 1985 and 1986 were obtained when final irrigations were applied at 487 and 450 DDAB, respectively”
t0“Spring Pea”
e1“or 366 DDAB in 1986”
Claim · model-written summary
Final irrigation at 366 or 588 DDAB increased canopy seed yield, germination and viable yield against earlier irrigation in 1986.
- Taxon
- spring peaLathyrus oleraceust0
- Treatment
- final irrigation was applied at 366 or 588 DDABe0
- Outcome
- total seed yield, percent germination, and viable seed yielde0
- Direction
- increasede0
- Qualifier
- throughout the canopye0
- Comparator
- earlier final irrigationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1986, total seed yield, percent germination, and viable seed yield throughout the canopy increased when the final irrigation was applied at 366 or 588 DDAB compared to earlier final irrigations.”
t0“Spring Pea”
Claim · model-written summary
Early irrigation cut-off reduced pods per plant and seeds per pod in upper canopy.
- Taxon
- spring peaLathyrus oleraceust0
- Organ / stage
- upper canopy (nodes 14 to 17)e0
- Treatment
- early irrigation cut-off datese0
- Outcome
- numbers of pods per plant, and seeds per pode0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Viable seed yield reductions for the early irrigation cut-off dates resulted primarily from reduced numbers of pods per plant, and seeds per pod in the upper canopy (nodes 14 to 17)”
t0“Spring Pea”
Claim · model-written summary
Early irrigation cut-off decreased germination across the canopy.
- Taxon
- spring peaLathyrus oleraceust0
- Organ / stage
- throughout the canopye0
- Treatment
- early irrigation cut-off datese1
- Outcome
- germination of seede0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased germination of seed produced throughout the canopy”
t0“Spring Pea”
e1“early irrigation cut-off dates resulted primarily from reduced numbers”
Claim · model-written summary
The authors recommend final irrigation at about 450 to 500 DDAB for viable seed yield comparable to irrigation through senescence.
- Taxon
- spring peaLathyrus oleraceust0
- Outcome
- application of the final irrigation at ≈450 to 500 DDABe0
- Comparator
- continued irrigation through early senescencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of the final irrigation at ≈450 to 500 DDAB (usually 2 weeks after final pod set) should produce viable seed yields similar to those obtained with continued irrigation through early senescence”
t0“Spring Pea”
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