Abstract
Seedlings of eight species of vegetables were grown in John Innes seed compost. Differences between the mean dry weights of seedlings of the different species shortly after emergence were directly related to differences in mean seed size between species; differences in mineral composition, however, were much greater for the seedlings than for the seeds. Chemical analysis of seedlings of cabbage, lettuce, onion and carrot grown in sand culture confirmed this finding.In sand culture, the dry weight per seedling increased as the K+ concentration in the nutrient medium increased from zero to 8−0 m.equiv.K+/l. although for cabbage and onion the increase was small over the range of 3-5 to 8−0 m.equiv.K+/l. The % K in the dry matter of the seedlings increased with increasing concentration of K+ in the nutrient medium. Both these effects were apparent 3 days after emergence of the seedlings.At about 20 days after emergence, seedlings of lettuce, onion and carrot grown in John Innes compost were smaller and had a lower % potassium content than those grown in sand culture at a K+ concentration of 8−0 or 3−5 m.equiv.K+/l. Cabbage seedlings grown in compost and in sand at the 3−5 m.equiv.K+/l. level were similar in size and composition. It is concluded that seedlings of lettuce, onion and carrot did not take up sufficient amounts of potassium from John Innes compost to sustain optimal growth.
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Claims 9
Claim · model-written summary
Mean dry weight differences between species were directly related to seed size differences.
Not reportedDirection
Verbatim
e0“Differences between the mean dry weights of seedlings of the different species shortly after emergence were directly related to differences in mean seed size between species”
t0“Vegetable Seedlings”
Claim · model-written summary
Mineral composition varied more among seedlings than seeds.
Verbatim
e0“differences in mineral composition, however, were much greater for the seedlings than for the seeds”
t0“Vegetable Seedlings”
Claim · model-written summary
Increasing medium potassium from zero to 8−0 m.equiv.K+/l. raised seedling dry weight.
Verbatim
e0“the dry weight per seedling increased as the K+ concentration in the nutrient medium increased from zero to 8−0 m.equiv.K+/l.”
t0“Vegetable Seedlings”
Claim · model-written summary
The dry weight increase in cabbage and onion was small between 3-5 and 8−0 m.equiv.K+/l.
- Taxon
- cabbage and onion
Brassica oleracea var. capitata
Allium cepae0 - Treatment
- 3-5 to 8−0 m.equiv.K+/l.e0
- Outcome
- increase was smalle0
- Direction
- increasee0
- Comparator
- 3-5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for cabbage and onion the increase was small over the range of 3-5 to 8−0 m.equiv.K+/l.”
Claim · model-written summary
Seedling potassium percentage increased with medium potassium concentration.
Verbatim
e0“The % K in the dry matter of the seedlings increased with increasing concentration of K+ in the nutrient medium”
t0“Vegetable Seedlings”
Claim · model-written summary
Lettuce, onion and carrot seedlings in compost were smaller than in sand culture at the specified potassium concentrations.
- Taxon
- lettuce, onion and carrot
Daucus carota
Lactuca sativaAllium cepae0 - Treatment
- John Innes composte0
- Outcome
- seedlingse0
- Direction
- smallere0
- Comparator
- sand culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seedlings of lettuce, onion and carrot grown in John Innes compost were smaller and had a lower % potassium content than those grown in sand culture at a K+ concentration of 8−0 or 3−5 m.equiv.K+/l.”
Claim · model-written summary
Lettuce, onion and carrot seedlings in compost had lower potassium percentage than in sand.
- Taxon
- lettuce, onion and carrotDaucus carotaLactuca sativaAllium cepae0
- Treatment
- John Innes composte0
- Outcome
- % potassium contente0
- Direction
- lowere0
- Comparator
- sand culturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seedlings of lettuce, onion and carrot grown in John Innes compost were smaller and had a lower % potassium content than those grown in sand culture at a K+ concentration of 8−0 or 3−5 m.equiv.K+/l.”
Claim · model-written summary
Cabbage seedlings in compost and 3−5 m.equiv.K+/l. sand were similar in size and composition.
- Taxon
- CabbageBrassica oleracea var. capitatae0
- Treatment
- composte0
- Outcome
- size and compositione0
- Direction
- similare0
- Comparator
- sande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cabbage seedlings grown in compost and in sand at the 3−5 m.equiv.K+/l. level were similar in size and composition”
Claim · model-written summary
The authors concluded compost supplied insufficient potassium for optimal growth of lettuce, onion and carrot.
- Taxon
- lettuce, onion and carrotDaucus carotaLactuca sativaAllium cepae0
- Outcome
- optimal growthe0
- Qualifier
- did not take up sufficient amounts of potassium from John Innes composte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seedlings of lettuce, onion and carrot did not take up sufficient amounts of potassium from John Innes compost to sustain optimal growth”
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