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Efficient Water Use in Ontario Apple Orchards Through Evapotranspiration-based Irrigation Scheduling and Drought Tolerant Rootstocks

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dc.contributor.advisor Cline, John
dc.contributor.author Wright, Derek
dc.date.accessioned 2015-05-20T18:35:54Z
dc.date.available 2015-05-20T18:35:54Z
dc.date.copyright 2015-05
dc.date.created 2015-05-12
dc.date.issued 2015-05-20
dc.identifier.uri http://hdl.handle.net/10214/8870
dc.description.abstract Maintaining tree growth and fruit production during periods of drought stress are important issues for apple producers. Apple trees were subjected to five irrigation treatments including three rates based on evapotranspiration, a commercial rate of 25.4 mm/week (positive control), and a rain-fed treatment (untreated). Irrigation treatments did not significantly affect marketable yield, fruit size, or trunk cross-sectional area (TCSA). In 2013 fruit quality was unaffected by irrigation; however, in 2014 the rain-fed treatment delayed maturity and increased the colour intensity of harvested fruit. When four rootstocks were evaluated for drought tolerance Vineland 3 (V.3) was observed to be unique for several physiological traits related to drought tolerance, including a greater retention of biomass and TCSA compared to the other genotypes, and stability in its leaf area:TCSA ratio and root:shoot ratios. The critical relative soil water contents of the four genotypes were also determined but there were no genotypic differences. en_US
dc.description.sponsorship The Ontario Ministry of Agriculture, Food and Rural Affairs New Directions Research Program, Agriculture and Agri-food Canada, and the University of Guelph en_US
dc.language.iso en en_US
dc.subject Apples en_US
dc.subject Malus x domestica en_US
dc.subject evapotranspiration en_US
dc.subject irrigation en_US
dc.subject rootstock en_US
dc.subject relative soil water content en_US
dc.subject normalized transpiration ratio en_US
dc.title Efficient Water Use in Ontario Apple Orchards Through Evapotranspiration-based Irrigation Scheduling and Drought Tolerant Rootstocks en_US
dc.type Thesis en_US
dc.degree.programme Plant Agriculture en_US
dc.degree.name Master of Science en_US
dc.degree.department Department of Plant Agriculture en_US
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