Abstract
The effects of prolonged exposure to low non-marking concentrations of sulphur dioxide have been studied, using alfalfa and cruciferae grown under differing conditions. Water supply, nutrient supply, sulphur content of nutrient supply, and age of plants were systematically varied to enable comparison of the effects of sulphur dioxide under the several conditions and to permit statistical analysis of the yield data. Under none of the conditions studied did sulphur dioxide treatment decrease the yield of alfalfa, under most of the conditions it had no significant effect on yield, and under some of the conditions it brought about significant yield increases. The data indicate that deficiencies in sulphur content of nutrient supply were made up by absorption of sulphur dioxide from the air. Age of plants and the amount of supplied nutrients had no effect on the yield response to the gas treatment. Alfalfa grown with a deficient supply of water seemed to respond more readily to the stimulating effect of the sulphur dioxide than did plants grown with an ample water supply. Alfalfa growing rapidly under favorable light conditions responded more readily to the growth effect of SO/sub 2/ than did alfalfa growing slowly under less favorable light conditions. Treatmentmore » with sulphur dioxide had no significant effect on yield of cruciferae. Analyses of the sulphur content of the alfalfa show that treatment with sulphur dioxide brought about significant increases in per cent total sulphur. The only other variable affecting sulphur content was the sulphur contained in the nutrient supply. Nitrogen analyses of alfalfa indicate that neither sulphur dioxide, water supply, nor sulphur content of nutrient supply had significant effect on nitrogen content of the alfalfa.« less
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Claims 10
Claim · model-written summary
Sulphur dioxide did not decrease alfalfa yield under any of the conditions studied.
- Taxon
- alfalfa
Medicago sativae0 - Treatment
- sulphur dioxide treatmente0
- Outcome
- yield of alfalfae0
- Direction
- no_changeinferrede0
- Qualifier
- under none of the conditions studiede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under none of the conditions studied did sulphur dioxide treatment decrease the yield of alfalfa”
Claim · model-written summary
Under most conditions sulphur dioxide had no significant effect on alfalfa yield.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- sulphur dioxidee0
- Outcome
- yielde1
- Direction
- no significant effecte1
- Qualifier
- under most of the conditionse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under none of the conditions studied did sulphur dioxide treatment decrease the yield of alfalfa”
e1“under most of the conditions it had no significant effect on yield”
Claim · model-written summary
Under some conditions sulphur dioxide significantly increased alfalfa yield.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- sulphur dioxidee0
- Outcome
- yielde1
- Direction
- increasese1
- Qualifier
- under some of the conditionse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under none of the conditions studied did sulphur dioxide treatment decrease the yield of alfalfa”
e1“under some of the conditions it brought about significant yield increases”
Claim · model-written summary
Sulphur dioxide had no significant effect on cruciferae yield.
- Taxon
- cruciferaeBrassicaceaee1
- Treatment
- sulphur dioxidee1
- Outcome
- yielde1
- Direction
- no significant effecte1
Not reportedComparator
Verbatim
e1“with sulphur dioxide had no significant effect on yield of cruciferae”
Claim · model-written summary
Sulphur dioxide treatment significantly increased the total sulphur content of alfalfa.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- sulphur dioxidee1
- Outcome
- per cent total sulphure1
- Direction
- increasese1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under none of the conditions studied did sulphur dioxide treatment decrease the yield of alfalfa”
e1“treatment with sulphur dioxide brought about significant increases in per cent total sulphur”
Claim · model-written summary
Neither sulphur dioxide, water supply nor sulphur content of the nutrient supply affected alfalfa nitrogen content.
- Taxon
- alfalfaMedicago sativae1
- Treatment
- sulphur dioxidee1
- Outcome
- nitrogen contente1
- Direction
- no_changeinferrede1
- Qualifier
- water supply, nor sulphur content of nutrient supplye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under none of the conditions studied did sulphur dioxide treatment decrease the yield of alfalfa”
e1“neither sulphur dioxide, water supply, nor sulphur content of nutrient supply had significant effect on nitrogen content of the alfalfa”
Claim · model-written summary
Plant age and the amount of supplied nutrients had no effect on the alfalfa yield response to sulphur dioxide.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- amount of supplied nutrientse1
- Outcome
- yield response to the gas treatmente1
- Direction
- no effecte1
- Qualifier
- Age of plants and the amount of supplied nutrientse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under none of the conditions studied did sulphur dioxide treatment decrease the yield of alfalfa”
e1“Age of plants and the amount of supplied nutrients had no effect on the yield response to the gas treatment”
Claim · model-written summary
Alfalfa grown with a deficient water supply responded more readily to the stimulating effect of sulphur dioxide than alfalfa with an ample water supply.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- deficient supply of watere1
- Outcome
- stimulating effect of the sulphur dioxidee1
- Direction
- more readilye1
- Comparator
- ample water supplye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under none of the conditions studied did sulphur dioxide treatment decrease the yield of alfalfa”
e1“Alfalfa grown with a deficient supply of water seemed to respond more readily to the stimulating effect of the sulphur dioxide than did plants grown with an ample water supply”
Claim · model-written summary
Rapidly growing alfalfa under favorable light responded more readily to the growth effect of sulphur dioxide than slowly growing alfalfa under less favorable light.
- Taxon
- alfalfaMedicago sativae0
- Treatment
- favorable light conditionse1
- Outcome
- growth effecte1
- Direction
- more readilye1
- Comparator
- less favorable light conditionse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under none of the conditions studied did sulphur dioxide treatment decrease the yield of alfalfa”
e1“Alfalfa growing rapidly under favorable light conditions responded more readily to the growth effect”
e2“than did alfalfa growing slowly under less favorable light conditions”
Claim · model-written summary
Sulphur deficiency in the nutrient supply was compensated by sulphur dioxide absorbed from the air in alfalfa.
- Taxon
- alfalfaMedicago sativae0
- Compound
- sulphur dioxidee1
- Outcome
- deficiencies in sulphur content of nutrient supplye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under none of the conditions studied did sulphur dioxide treatment decrease the yield of alfalfa”
e1“deficiencies in sulphur content of nutrient supply were made up by absorption of sulphur dioxide from the air”