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Effects of Climatic Factors on Fruit Volume Increase and Leaf Water Deficit of Citrus in Relation to Soil Suction¹

ABSTRACT

The primary factors affecting the rate of fruit volume increase and leaf water deficit of navel orange trees were investigated under two irrigation treatments. One treatment was applied when tensiometers in the major root zone indicated 20 cbar soil suction and the other treatment was applied at 100 cbar soil suction. The correlations between either fruit volume increase or leaf water deficit and various environmental conditions were studied by factor analysis to determine possible primary factors affecting the water status of the trees. Soil suction, a primary factor in both treatments, influenced the fruit and the leaf in only the 100 cbar treatment. Rate of water movement through the soil to the plant roots could be the underlying factor. Another factor, evaporation power of the atmosphere during high diurnal transpiration affected the rate of fruit volume increase in only the 100 cbar treatment.

¹ Paper No. 1585, University of California Citrus Research Center, and Agr. Exp. Sta., Riverside.

² Assistant Horticulturist, Associate Soil Physicist, Associate Biometrician, and Laboratory Technician, respectively, University of California, Riverside. P. B. Lombard is now with the Southern Oregon Exp. Sta., Medford, Oreg.

Received for publication June 28, 1963. Accepted for publication November 30, 1964.