Abstract
The effects of chronic ozone (O 3 ) and (or) nitrogen fertilizer on growth, regrowth, and forage production of ladino clover (Trifolium repens L. cv. Tillman) and tall fescue (Festuca arundinaceae Schreb. cv. Kentucky 31) grown in pots separately and together in open-top chambers in the field were studied from April 27 to October 19, 1979. Mean 7 h per day (0930 to 1630 EDT) O 3 concentrations for this period were as follows: charcoal-filtered air chambers, 0.03 ppm; nonfiltered air chambers (NF-1), 0.05 ppm; nonfiltered air chambers with O 3 added for 7 h per day (NF-2), 0.08 ppm; and ambient air, 0.05 ppm. Ozone reduced regrowth (milligrams of dry weight per plant per week) and total forage production of clover and the fescue–clover mixture. The magnitude of the reductions of clover growth and forage production corresponded in general to the O 3 levels. Growth of fescue was not significantly modified by O 3 treatments. Nitrogen fertilization stimulated the growth of fescue but had little impact on the growth of clover. Nitrogen fertilization did not change the response of either species to O 3 .
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Claims 7
Claim · model-written summary
Ozone reduced clover regrowth and forage production.
- Treatment
- Ozonee0
- Outcome
- regrowth (milligrams of dry weight per plant per week) and total forage productione0
- Direction
- reducede0
TrifoliumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ozone reduced regrowth (milligrams of dry weight per plant per week) and total forage production of clover”
Claim · model-written summary
Ozone reduced regrowth and forage production of the fescue–clover mixture.
- Taxon
- fescue–clover mixturee0
- Treatment
- Ozonee0
- Outcome
- regrowth (milligrams of dry weight per plant per week) and total forage productione0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“Ozone reduced regrowth (milligrams of dry weight per plant per week) and total forage production of clover and the fescue–clover mixture”
Claim · model-written summary
Clover growth and forage production reductions generally corresponded to ozone levels.
- Treatment
- O 3 levelse0
- Outcome
- reductions of clover growth and forage productione0
- Direction
- reductionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The magnitude of the reductions of clover growth and forage production corresponded in general to the O 3 levels.”
Claim · model-written summary
Ozone did not significantly modify fescue growth.
Not reportedComparator
Verbatim
e0“Growth of fescue was not significantly modified by O 3 treatments.”
Claim · model-written summary
Nitrogen fertilization stimulated fescue growth.
Not reportedComparator
Verbatim
e0“Nitrogen fertilization stimulated the growth of fescue”
Claim · model-written summary
Nitrogen fertilization had little impact on clover growth.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen fertilization stimulated the growth of fescue but had little impact on the growth of clover.”
Claim · model-written summary
Nitrogen fertilization did not change either species response to ozone.
- Taxon
- either speciese0
- Treatment
- Nitrogen fertilizatione0
- Outcome
- response of either species to O 3e0
- Direction
- did not changee0
Not reportedComparator
Verbatim
e0“Nitrogen fertilization did not change the response of either species to O 3 .”
The same questions in other papers
fertilization · growth · TrifoliumPositive and negative results
2 papers in the same direction as this paper · 10 in the opposite direction
- positive
- positive
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See all 13 papers →ozone · yield · TrifoliumResults agree
1 paper in the same direction as this paper
- negative
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.