אסיף מאגר המחקר החקלאי

Irrigation and crop load interactions in relation to apple yield and fruit size distribution

Year:

1997

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Volume :

122

Co-Authors:

Naor, A., Golan Research Institute, P.O. Box 97, Kazrin 12900, Israel
Klein, I., Institute of Horticulture, ARO, Volcani Center, Bet Dagan 50250, Israel
Doron, I., Extension Service, Ministry of Agriculture, P.O. Box 50, Kazrin 12900, Israel
Gal, Y., Extension Service, Ministry of Agriculture, P.O. Box 50, Kazrin 12900, Israel
Ben-David, Z., Research and Development, The Golan Heights, Kazrin 12900, Israel
Bravdo, B., Department of Viticulture, Faculty of Agriculture, Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel

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Abstract:

The interaction between irrigation and crop load with respect to fruit size distribution was investigated in a 'Golden Delicious' apple (Malus domestica Borkh) orchard located in a semi-arid zone. Irrigation levels during the main fruit expansion phase ranged from 0.42 to 1.06 of the Class A pan evaporation coefficient. Crop load was adjusted to 100 to 450 fruit/tree in the 1250 trees/ha orchard by hand thinning. Total yield was not affected by irrigation level up to a crop load of 200 fruit/tree. Yield of all grades >65 mm was affected by irrigation level for higher crop densities. The yield of fruit of diameter <75 mm was not affected by increasing the Class A pan evaporation coefficient above 0.75. Our data indicate that availability of assimilates may limit the size of fruit with potential to grow larger than 70 mm in diameter at all crop loads higher than 200 fruit/tree. This limitation increases with decreasing irrigation level. The volumetric relative growth rate (VRGR) increased with irrigation level and with decreasing crop load. VRGR was more affected by crop load than by irrigation level in the ranges studied.

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