Abstract
Abstract Corn ( Zea mays L.) was planted in a Maury silt loam soil under conventional tillage and in a chemically‐killed bluegrass ( Poa pratensis L.) sod in 1970 and 1971 in order to determine the behavior of nitrate and the yield of corn under both cultural systems. Nitrate under both cultural treatments was sampled before and after June rainfall periods in both years. A large fraction of the nitrate was lost from the top 90 cm of soil under the killed‐sod plots, whereas, no nitrate was lost from the conventionally‐tilled plots. The loss of nitrate under the killed sod was attributed to two factors: 1) lower evaporation from the mulched soil; and 2) deep penetration of water and nitrate through larger pores in the wetter, mulched soil. Corn yields where nitrogen was applied tended to be higher on the killed‐sod plots in a dry year (1970) and about the same in a wet year (1971). However, the no nitrogen treatment on the mulched plots had a much lower yield than did the conventionally‐tilled no nitrogen treatment in the wet year of 1971. The results suggest that higher nitrogen rates may be required when corn is grown in a killed sod mulch as compared to conventionally‐tilled corn.
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Claims 6
Claim · model-written summary
Nitrate was lost from the top soil under killed sod.
- Taxon
- Corn
Zea mays subsp. mayse1 - Treatment
- killed‐sod plotse0
- Outcome
- nitrate was lost from the top 90 cm of soile0
- Direction
- loste0
- Comparator
- conventionally‐tilled plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A large fraction of the nitrate was lost from the top 90 cm of soil under the killed‐sod plots, whereas, no nitrate was lost from the conventionally‐tilled plots”
t0“Corn”
e1“Corn yields where nitrogen was applied tended to be higher on the killed‐sod plots in a dry year (1970)”
Claim · model-written summary
No nitrate was lost under conventional tillage.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- nitrate was loste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no nitrate was lost from the conventionally‐tilled plots”
t0“Corn”
e1“Corn yields where nitrogen was applied tended to be higher on the killed‐sod plots in a dry year (1970)”
Claim · model-written summary
In a dry year with nitrogen, killed sod tended to raise corn yield.
- Taxon
- CornZea mays subsp. mayse0e1
- Treatment
- killed‐sod plotse0
- Outcome
- Corn yieldse0
- Direction
- highere0
- Qualifier
- dry year (1970)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn yields where nitrogen was applied tended to be higher on the killed‐sod plots in a dry year (1970)”
t0“Corn”
e1“Corn yields where nitrogen was applied tended to be higher on the killed‐sod plots in a dry year (1970)”
Claim · model-written summary
In a wet year with nitrogen, corn yields were about the same across systems.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- Corn yieldse1
- Direction
- about the samee0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“about the same in a wet year (1971)”
t0“Corn”
e1“Corn yields where nitrogen was applied tended to be higher on the killed‐sod plots in a dry year (1970)”
Claim · model-written summary
Without nitrogen in the wet year, mulched plots yielded much less.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- no nitrogen treatment on the mulched plotse0
- Outcome
- yielde0
- Direction
- much lowere0
- Comparator
- conventionally‐tilled no nitrogen treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the no nitrogen treatment on the mulched plots had a much lower yield than did the conventionally‐tilled no nitrogen treatment in the wet year of 1971”
t0“Corn”
e1“Corn yields where nitrogen was applied tended to be higher on the killed‐sod plots in a dry year (1970)”
Claim · model-written summary
The authors suggest higher nitrogen rates may be needed with killed sod mulch.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- higher nitrogen rates may be requirede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher nitrogen rates may be required when corn is grown in a killed sod mulch as compared to conventionally‐tilled corn”
The same questions in other papers
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This paper is about lacking the nutrient, so it counts the other way round here.
- positive
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See all 2,185 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.