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Mohammad Esmaeil Amiri

  Esmaeil Fallahi, Bahar Fallahi (USA), Mohammad Amiri (Iran), Bahman Shafii (USA)
Long-Term Fruit Yield and Quality of Various Gala Apple Strain-Rootstock Combinations under an Evapotranspiration-Based Drip Irrigation System
Abstract


Original Research Paper: In a long-term study in ‘Gala’ apple (Malus × domestica Borkh) between 2004 and 2007, fruit yield and physical quality attributes (fruit weight, skin red color, and incidences of splitting and russeting) of five strains (‘Pacific’, ‘Gale’, ‘Brookfield’, ‘Treco Red #42’ and ‘Buckeye’) on RN29 rootstock and four strains (‘Scarlet’, ‘Royal’, ‘Ultima’ and ‘Crimson’) on Bud9 rootstock were examined under a drip irrigation system using crop evapotranspiration (ETc) adjusted by the percentage of ground shade. The strain-rootstock combinations used in this study represent the most commonly planted ‘Gala’ trees in the United States apple industry. ‘Pacific’, ‘Brookfield’, ‘Treco’ and ‘Buckeye’ strains (all on RN29 rootstock) had higher fruit yield in most years, resulting in significantly higher cumulative yields than ‘Scarlet’, ‘Royal’, ‘Ultima’ and ‘Crimson’ strains on Bud9 rootstock. ‘Brookfield’, ‘Treco’, ‘Gale’, ‘Buckeye’ on RN29 rootstock had similar average fruit weights and their weights were often higher than those in ‘Scarlett’, ‘Royal’, and ‘Ultima’ on Bud9 rootstock. ‘Buckeye’ and ‘Gale Gala’ fruits had higher visual red color ratings compared to the other strains every year. Considering all yield and quality attributes, we recommend ‘Buckeye’ and ‘Gale’ strains on RN29 rootstock under climate conditions of Intermountain west region of the USA. With a drip irrigation system, each young tree received an average of 2921 L (449 mm) and each mature tree received and average of 3996 L (614.1 mm) of water per growing season.

 

 

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