Abstract
Field experiments were conducted to determine the effect of shattercane interference on corn grain yield and nitrogen uptake in central Missouri. A glyphosate-resistant corn variety was planted, and atrazine was used to control all weeds except shattercane. Glyphosate was applied when shattercane was 8, 15, 23, 31, 38, or 46 cm tall, and plots were hand weeded weekly thereafter. Season-long shattercane interference resulted in an 85% yield loss in 1999 and a 43% yield loss in 2000. Yield reductions occurred when shattercane was allowed to remain with corn until it was 31 cm tall. In both years, late-season corn biomass N content was highly correlated (r = 0.95 and 0.84, respectively) with corn yield. When shattercane was allowed to reach the maximum recommended height for nicosulfuron or primisulfuron application (31 cm), significant yield losses occurred, and shattercane accumulated 10 and 20 kg N/ha, whereas corn accumulated 10 and 16 kg N/ha, respectively, in 1999 and 2000. Corn grain yield was reduced 0.66% (r2 = 0.71) for each day of interference before a postemergence (POST) application of glyphosate.Nomenclature: Glyphosate; nicosulfuron; primisulfuron; shattercane, Sorghum bicolor (L.) Moench. #3 SORVU; corn, Zea mays (L.) # ZEAMX ‘DK626RR’.Additional index words: Weed interference.Abbreviations: POST, postemergence; PRE, preemergence.
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Claims 10
Claim · model-written summary
Season-long shattercane interference caused 85% corn yield loss in 1999.
- Taxon
- corn
Zea mays subsp. mayse1 - Treatment
- Season-long shattercane interferencee0
- Interactor
- shattercane
Sorghum ×drummondiie0weed - Outcome
- yield losse0
- Direction
- losse0
- Value
- 85%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Season-long shattercane interference resulted in an 85% yield loss in 1999”
e1“corn grain yield”
Claim · model-written summary
Season-long shattercane interference caused 43% corn yield loss in 2000.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- Season-long shattercane interferencee0
- Interactor
- shattercaneSorghum ×drummondiie0weed
- Outcome
- yield losse0
- Direction
- losse0
- Value
- 43%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Season-long shattercane interference resulted in an 85% yield loss in 1999 and a 43% yield loss in 2000”
e1“corn grain yield”
Claim · model-written summary
Corn yield fell when shattercane remained until 31 cm tall.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- shattercane was allowed to remain with corn until it was 31 cm talle0
- Interactor
- shattercaneSorghum ×drummondiie0weed
- Outcome
- Yielde0
- Direction
- reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield reductions occurred when shattercane was allowed to remain with corn until it was 31 cm tall”
Claim · model-written summary
Late-season corn biomass nitrogen content correlated strongly with yield in 1999.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- corn biomass N contente0
- Value
- r = 0.95e0
- Comparator
- corn yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“late-season corn biomass N content was highly correlated (r = 0.95 and 0.84, respectively) with corn yield”
Claim · model-written summary
Late-season corn biomass nitrogen content correlated strongly with yield in 2000.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- corn biomass N contente0
- Value
- 0.84e0
- Comparator
- corn yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“late-season corn biomass N content was highly correlated (r = 0.95 and 0.84, respectively) with corn yield”
Claim · model-written summary
At shattercane height 31 cm, corn had significant yield loss.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- shattercane was allowed to reach the maximum recommended height for nicosulfuron or primisulfuron application (31 cm)e0
- Interactor
- shattercaneSorghum ×drummondiie0weed
- Outcome
- yield lossese0
- Direction
- lossese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When shattercane was allowed to reach the maximum recommended height for nicosulfuron or primisulfuron application (31 cm), significant yield losses occurred”
e1“corn grain yield”
Claim · model-written summary
At 31 cm shattercane height, shattercane accumulated 10 kg N/ha in 1999.
- Taxon
- cornZea mays subsp. mayse0
- Interactor
- shattercaneSorghum ×drummondiie0weed
- Outcome
- shattercane accumulatede0
- Value
- 10e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shattercane accumulated 10 and 20 kg N/ha, whereas corn accumulated 10 and 16 kg N/ha, respectively, in 1999 and 2000”
Claim · model-written summary
At 31 cm shattercane height, shattercane accumulated 20 kg N/ha in 2000.
- Taxon
- cornZea mays subsp. mayse0
- Interactor
- shattercaneSorghum ×drummondiie0weed
- Outcome
- shattercane accumulatede0
- Value
- 20 kg N/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shattercane accumulated 10 and 20 kg N/ha, whereas corn accumulated 10 and 16 kg N/ha, respectively, in 1999 and 2000”
Claim · model-written summary
At 31 cm shattercane height, corn accumulated 10 kg N/ha in 1999.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- corn accumulatede0
- Value
- 10e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn accumulated 10 and 16 kg N/ha, respectively, in 1999 and 2000”
Claim · model-written summary
At 31 cm shattercane height, corn accumulated 16 kg N/ha in 2000.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- corn accumulatede0
- Value
- 16 kg N/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn accumulated 10 and 16 kg N/ha, respectively, in 1999 and 2000”
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