Abstract
Abstract Acid rain is a documented phenomenon over much of the eastern and midwestern United States, including major portions of the Corn Belt. However, few studies report the effect of acid rain on yield of corn ( Zea mays L.). Field experiments were conducted in 1983 and 1984 on a Flanagan silt loam (fine, montmorillonitic, mesic Aquic Argiudoll) soil at Urbana, IL. Two corn cultivars (Pioneer 3377 and B73✕Mol7) were protected from ambient rain by two automated movable rain exclusion shelters and were exposed to one of six simulated rain acidities ranging from pH 5.6 to 3.0. Analysis of the effect of rainfall pH on grain yield showed no significant linear or quadratic trend ( α =0.10) for either cultivar in individual years or with both years combined. Comparisons among treatments for both cultivars showed rain simulants with no added acid (pH 5.6) resulted in grain yields that were not significantly different from the average grain yields of the other five pH treatments. For B73✕Mol7, the 2‐yr combined yield for the pH 3.0 treatment was significantly lower (5.7%) than the average yield for the other five treatments. This same contrast was not significant for Pioneer 3377. These results imply that under normal environmental conditions and agronomic practices, rainfall at its present levels of acidity has little if any effect on corn yields.
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Claims 5
Claim · model-written summary
Rainfall pH had no significant linear or quadratic effect on grain yield of either corn cultivar.
- Taxon
- corn
Zea mays subsp. mayse1 - Material
- Pioneer 3377 and B73✕Mol7e1
- Treatment
- rainfall pHe2
- Outcome
- grain yielde2
- Direction
- no_changeinferrede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Two corn cultivars (Pioneer 3377 and B73✕Mol7) were protected from ambient rain”
e2“Analysis of the effect of rainfall pH on grain yield showed no significant linear or quadratic trend”
Claim · model-written summary
Rain at pH 5.6 with no added acid gave grain yields not significantly different from the average of the other five pH treatments.
- Taxon
- cornZea mays subsp. mayse1
- Material
- Pioneer 3377 and B73✕Mol7e1
- Treatment
- rain simulants with no added acid (pH 5.6)e2
- Outcome
- grain yieldse2
- Direction
- no_changeinferrede2
- Comparator
- the average grain yields of the other five pH treatmentse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Two corn cultivars (Pioneer 3377 and B73✕Mol7) were protected from ambient rain”
e2“rain simulants with no added acid (pH 5.6) resulted in grain yields that were not significantly different from the average grain yields of the other five pH treatments”
Claim · model-written summary
For B73✕Mol7, pH 3.0 rain lowered yield by 5.7% relative to the average of the other five pH treatments, a significant difference.
- Taxon
- cornZea mays subsp. mayse1
- Material
- B73✕Mol7e1
- Treatment
- pH 3.0 treatmente2
- Outcome
- yielde2
- Direction
- lowere2
- Value
- 5.7%e2
- Comparator
- the average yield for the other five treatmentse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Two corn cultivars (Pioneer 3377 and B73✕Mol7) were protected from ambient rain”
e2“the pH 3.0 treatment was significantly lower (5.7%) than the average yield for the other five treatments”
Claim · model-written summary
The pH 3.0 contrast was not significant for Pioneer 3377.
- Taxon
- cornZea mays subsp. mayse1
- Material
- Pioneer 3377e3
- Treatment
- pH 3.0 treatmente2
- Outcome
- yielde2
- Direction
- no_changeinferrede3
- Comparator
- the average yield for the other five treatmentse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Two corn cultivars (Pioneer 3377 and B73✕Mol7) were protected from ambient rain”
e2“the pH 3.0 treatment was significantly lower (5.7%) than the average yield for the other five treatments”
e3“This same contrast was not significant for Pioneer 3377”
Claim · model-written summary
Under normal conditions and agronomic practices, rainfall at its present acidity has little if any effect on corn yields.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- rainfall at its present levels of aciditye2
- Outcome
- corn yieldse2
- Direction
- no_changeinferrede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Two corn cultivars (Pioneer 3377 and B73✕Mol7) were protected from ambient rain”
e2“These results imply that under normal environmental conditions and agronomic practices, rainfall at its present levels of acidity has little if any effect on corn yields”
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See all 70 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.