Claim · model-written summary
A greater change in humidity would be needed to maintain upper-leaf transpiration at reduced irradiance than lower-leaf transpiration.
- Taxon
- tomato
Solanum lycopersicumt0 - Treatment
- reduced irradiancee1
- Outcome
- transpiration from the upper leavese1
- Direction
- greatere1
- Comparator
- the lower onese1
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSettingValueQualifier
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“tomato leaves”
e1“Hence a greater change in humidity would be required to maintain transpiration from the upper leaves at reduced irradiance than from the lower ones”
Title
D. P. Airman; G. Houter Journal of Horticultural Science 1990. doi:10.1080/00221589.1990.11516053
Other claims from this paper (7)
- Association Solar radiation has a greater effect on the upper parts of tomato plants than on progressively shaded lower canopy parts.
- Mechanism The calcium accumulation rate in tomato leaves would be closely linked to transpiration.
- Mechanism The model can explain calcium deficiency in tomato leaves that develop during periods of low solar intensity and high humidity.
- Recommendation Lowering environmental humidity with an evaporative equivalence factor is proposed to compensate for low radiation in tomato crops.
- Recommendation Transpiration should be at least 2.2 times the rate of leaf expansion to prevent appreciable yield loss from calcium deficiency in tomato.
- Recommendation A total of 8.7 MJ m-2 d_l of radiation and radiation equivalent would be required for tomato.
- Recommendation Vapour pressure deficit compensation of 0.04 kPa per MJ m-2 d-1 of radiation shortfall is required in tomato.