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Effect of soil, suction, relative humidity and temperature on apparent photosynthesis and transpiration of rough lemon

Effect of soil, suction, relative humidity and temperature on apparent photosynthesis and transpiration of rough lemon

Proceedings American Society Hort Science 87: 168-175

Fully expanded individual leaves of potted/rough lemons (Citrus jambhiri) were enclosed in an illuminated clear plastic chamber and the CO2 and moisture content of both incoming and outgoing air were monitored. Soil suction was measured by a tensiometer and resistance block. Both relative humidity (RH) and temperature of the air in the leaf chamber were varied to determine their effects on apparent photosynthesis and transpiration. At 20% RH and 0.5 bar or less soil suction, both apparent photosynthesis and transpiration declined during the day but recovered overnight. At above 0.5 bar soil suction only partial recovery occurred. Watering the plant caused an immediate increase in both responses and the initial high levels were shown on the following morning. Increasing leaf temperature from 22[degree] to 34[degree] C with low soil suction and low (18%) RH reduced CO2 exchanged by 50% but at 30-54% RH the effect was much less. With 10 bars soil suction and high RN the CO2 exchange declined 50% when the temperature was raised from 22[degree] to 29[degree] C. Soil suction above 10 bars caused leaf wilting but if RH was kept at 40-55%, CO2 absorption continued at about 2 mg/dm2/per hour.

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Accession: 024560992

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