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Container Moisture State and Stomatal Resistance in Nursery Plants1

John R. Havis

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Abstract

Abstract Stomatal resistance (r s ) was measured in Cornus florida L., Magnolia × soulangeana Soul., Rhododendron cv. Nova Zembla and Viburnum carlesii Hemsl. in containers with a range of different matric potentials (ψm). Significant increase in r s occurred at potentials between −250 and −390 millibar (mb) in clear, warm weather. Minimum ψm of −200 mg is suggested to avoid water stress.

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Abstract Stomatal resistance (r s ) was measured in Cornus florida L., Magnolia × soulangeana Soul., Rhododendron cv. Nova Zembla and Viburnum carlesii Hemsl. in containers with a range of different matric potentials (ψm). Significant increase in r s occurred at potentials between −250 and −390 millibar (mb) in clear, warm weather. Minimum ψm of −200 mg is suggested to avoid water stress.

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Available abstract

Abstract Stomatal resistance (r s ) was measured in Cornus florida L., Magnolia × soulangeana Soul., Rhododendron cv. Nova Zembla and Viburnum carlesii Hemsl. in containers with a range of different matric potentials (ψm). Significant increase in r s occurred at potentials between −250 and −390 millibar (mb) in clear, warm weather. Minimum ψm of −200 mg is suggested to avoid water stress.

Key concepts: Horticulture, Botany, Viburnum, Stomatal density, Humidity, Water content, Resistance (ecology), Environmental science

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