Abstract
We previously reported that grain yield of the maize ( Zea mays L.) hybrid ‘Trojan TXS 85’ was increased following 100% defoliation at the five‐leaf stage. The objective of this study was to extend those observations and to examine the relationship between early defoliation, soil‐water use, and yield. Eight additional years of defoliation trials (plants 100% defoliated at the five‐leaf stage) were conducted in the field with Trojan TXS 85. The soils at the two experimental sites are a Webster clay loam (Typic Haplaquoll) and a Nicollet clay loam (Aquic Hapludoll). Defoliation decreased grain yield 3 of the 8 additional yr, and had a nonsignificant (negative) effect the remaining 5 yr. Positive yield response to defoliation was associated with low yields and with low end‐of‐season available soil water. It thus appears that an early reduction in vegetative growth of maize might help avoid drought stress in regions where late‐season water stress is common. Early defoliation does not appear to be a practical management approach in high‐yielding environments, such as the upper Midwest, where soil‐water deficits are infrequent and unpredictable.
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Claims 6
Claim · model-written summary
Defoliation decreased grain yield in three of eight additional years.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Defoliation decreased grain yield 3 of the 8 additional yr”
t0“Maize”
Claim · model-written summary
Defoliation had a nonsignificant negative yield effect in the other five years.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“had a nonsignificant (negative) effect the remaining 5 yr.”
t0“Maize”
e1“Defoliation decreased grain yield 3 of the 8 additional yr”
Claim · model-written summary
Positive yield response to defoliation was associated with low yields.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Positive yield response to defoliation was associated with low yields”
t0“Maize”
Claim · model-written summary
Positive yield response to defoliation was associated with low end-of-season soil water.
- Outcome
- yield response to defoliatione0
- Direction
- Positivee0
- Setting
- low end‐of‐season available soil watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Positive yield response to defoliation was associated with low yields and with low end‐of‐season available soil water.”
t0“Maize”
Claim · model-written summary
Early reduction of vegetative growth may help avoid drought stress where late-season water stress is common.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an early reduction in vegetative growth of maize might help avoid drought stress in regions where late‐season water stress is common.”
Claim · model-written summary
Early defoliation is not considered practical in high-yielding environments.
- Outcome
- Early defoliation does not appear to be a practical management approache0
- Setting
- upper Midweste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early defoliation does not appear to be a practical management approach in high‐yielding environments, such as the upper Midwest, where soil‐water deficits are infrequent and unpredictable.”
t0“Maize”
The same questions in other papers
pruning · yield · Zea mays (maize)Positive and negative results
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See all 174 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.