Abstract
In a tobacco greenhouse experiment, potassium was applied to the muck layer at 3.32, 6.64, 9.96, 13.28, and 16.60 pounds, with and without 3 pounds of chlorine, per 900 square feet. A check treatment received no potassium or chlorine. Greatest total dry weight per plot and highest rate of survival of seedlings in the field was obtained with the 3.32-pound rate of potassium with or without chlorine; dry weight of tops, height of plant, leaf area, and total dry weight per plot tended to decrease with each increment of potassium above 3.32 pounds. High levels of applied potassium increased soluble salts in the muck to a level which retarded plant growth. Apparently the muck was capable of releasing large amounts of potassium for plant growth as more potassium was taken up by the plants than was supplied by the 3.32-pound rate. Chlorine in the fertilizer increased the total ash and potassium content of the seedlings but tended to decrease the nitrogen. Potassium and chlorine had no effect on the weight of roots and relative turgidity of the plants.
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Claims 8
Claim · model-written summary
The 3.32-pound potassium rate gave the greatest total dry weight and survival of tobacco seedlings.
- Taxon
- tobacco
Nicotiana tabacume0 - Treatment
- 3.32-pound rate of potassiume2
- Outcome
- total dry weight per plote2
- Direction
- Greateste2
- Setting
- greenhousee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In a tobacco greenhouse experiment”
e2“Greatest total dry weight per plot and highest rate of survival of seedlings in the field was obtained with the 3.32-pound rate of potassium with or without chlorine”
Claim · model-written summary
Dry weight of tops, plant height and leaf area tended to decrease with each increment of potassium above 3.32 pounds.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- increment of potassium above 3.32 poundse3
- Outcome
- dry weight of tops, height of plant, leaf areae3
- Direction
- tended to decreasee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In a tobacco greenhouse experiment”
e3“dry weight of tops, height of plant, leaf area, and total dry weight per plot tended to decrease with each increment of potassium above 3.32 pounds”
Claim · model-written summary
Total dry weight per plot tended to decrease with each increment of potassium above 3.32 pounds.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- increment of potassium above 3.32 poundse3
- Outcome
- total dry weight per plote3
- Direction
- tended to decreasee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In a tobacco greenhouse experiment”
e3“dry weight of tops, height of plant, leaf area, and total dry weight per plot tended to decrease with each increment of potassium above 3.32 pounds”
Claim · model-written summary
High potassium levels increased soluble salts in the muck to a level that retarded tobacco seedling growth.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- High levels of applied potassiume4
- Compound
- soluble saltse4
- Outcome
- plant growthe4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In a tobacco greenhouse experiment”
e4“High levels of applied potassium increased soluble salts in the muck to a level which retarded plant growth”
Claim · model-written summary
Tobacco plants took up more potassium than the 3.32-pound rate supplied, as the muck released large amounts of potassium.
- Taxon
- tobaccoNicotiana tabacume0
- Outcome
- more potassium was taken up by the plantse5
- Qualifier
- than was supplied by the 3.32-pound ratee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In a tobacco greenhouse experiment”
e5“Apparently the muck was capable of releasing large amounts of potassium for plant growth as more potassium was taken up by the plants than was supplied by the 3.32-pound rate”
Claim · model-written summary
Chlorine in the fertilizer increased total ash and potassium content of tobacco seedlings.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- Chlorine in the fertilizere6
- Outcome
- total ash and potassium contente6
- Direction
- increasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In a tobacco greenhouse experiment”
e6“Chlorine in the fertilizer increased the total ash and potassium content of the seedlings but tended to decrease the nitrogen”
Claim · model-written summary
Chlorine in the fertilizer tended to decrease nitrogen content of tobacco seedlings.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- Chlorine in the fertilizere6
- Outcome
- nitrogene6
- Direction
- tended to decreasee6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In a tobacco greenhouse experiment”
e6“Chlorine in the fertilizer increased the total ash and potassium content of the seedlings but tended to decrease the nitrogen”
Claim · model-written summary
Potassium and chlorine had no effect on the weight of tobacco roots or on relative turgidity.
- Taxon
- tobaccoNicotiana tabacume0
- Treatment
- Potassium and chlorinee7
- Outcome
- weight of roots and relative turgiditye7
- Direction
- no effecte7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In a tobacco greenhouse experiment”
e7“Potassium and chlorine had no effect on the weight of roots and relative turgidity of the plants”
The same questions in other papers
potassium · growth · Nicotiana tabacum (tobacco)Positive and negative results
14 papers in the same direction as this paper · 7 in the opposite direction
- negative
- negative
- no effect
18 papers more in this group
See all 22 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.