Abstract
SUMMARY A method of controlling the tension (hydrostatic head)—and hence soil moisture—in seed emergence tests, using porous ceramic plates, is described. In the compost employed emergence was good at 2 cm. mercury tension but severely retarded at 1 cm. mercury. This small difference in tension was associated with a large difference in the soil pore space occupied by air. Tensions below 1 cm. mercury would be expected in seed boxes watered according to customary practice. The results are discussed in the light of reports on gaseous diffusion in porous media and on gas balance in soil at different tensions. The need for ensuring an adequate distribution of pores large enough to be filled with air at the low tensions found in seed boxes is indicated.
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Claims 2
Claim · model-written summary
Tomato seed emergence was severely retarded at 1 cm. mercury tension compared with 2 cm. mercury tension.
- Taxon
- Tomato
Solanum lycopersicumt0 - Treatment
- 1 cm. mercurye1
- Outcome
- emergencee1
- Direction
- retardede1
- Comparator
- 2 cm. mercury tensione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato seed germination”
e1“emergence was good at 2 cm. mercury tension but severely retarded at 1 cm. mercury”
Claim · model-written summary
A small difference in soil tension was associated with a large difference in soil pore space occupied by air.
- Taxon
- TomatoSolanum lycopersicumt0
- Treatment
- small difference in tensione2
- Outcome
- soil pore space occupied by aire2
- Direction
- large differencee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tomato seed germination”
e2“This small difference in tension was associated with a large difference in the soil pore space occupied by air”
The same questions in other papers
mercury atom · growth · Solanum lycopersicum (tomato)Results agree
2 papers in the same direction as this paper
- negative
- 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.