Harvest maturity indices of sweet cherries for brining Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/kd17cx00z

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  • Oregon's Willamette Valley sweet cherry growers have developed a market for large, high quality, stem-on brining cherries. The maturity indices pull force (PF), percent soluble solids (SS), and weight (Wt) were chosen as being the most probable indicators of maturity. The rate of change of PF during the harvest period is best described as a logarithmic function, which appears to be consistent between orchards. In contrast the rate of change in SS over time, best described as a quadratic function, was not found to be consistent between orchards. A conversion equation for changing cherry fruit diameter measurements to corresponding Wt was also developed as was a quadratic function to best describe the rate of change in Wt over time during the harvest period. The relationship of Wt and PF was also determined and was best described as a linear function. The difficulty of removing fruit during the hottest part of the day has resulted in increased fruit damage. Water potentials Ψ of fruit pedicel, as a measure of pedicel turgor, and leaf petioles were measured to determine the diurnal cycle, which could be used to identify harvest times where fruit damage would be reduced. A procedure to measure fruit Ψ using a Scholander-type pressure chamber was used. Fruit pedicel Ψ was always lower than leaf Ψ at 6 A.M. but leaf Ψ was usually lower during the day. There appears to be some varietal difference in Ψ but maturity does not appear to have an effect. The magnitude of fruit pedicel and leaf Ψ increased under stress conditions. Minimum fruit pedicel and Leaf Ψ was reached at at about 2 P.M. and then appears to return to the higher Ψ during the night.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2011-09-26T15:42:08Z (GMT) No. of bitstreams: 1 TVERGYAKPAULD1977.pdf: 631912 bytes, checksum: 29ece3e33a0d124d74dcd3ec34ae9633 (MD5)
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