Graduate Thesis Or Dissertation

 

Chilling as a factor in crop location with particular reference to deciduous orchards in California Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3t945t419

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  • Several empirical formulas that may be used to estimate available chilling are presented in this study. Many climatic parameters were considered in the derivation of these formulas. One equation employing only maximum and minimum temperatures had a coefficients of correlation (R) and R² values of .978 and .957, respectively. This equation was used in estimating the availability of chilling at 273 stations throughout California. Using these estimates and considering such factors as altitude and marine influences, the availability of chilling throughout California was mapped. Factors that influence the effectiveness of the chilling received such as low and high temperatures, high light intensity, shade, fog, cloud cover, topography and wind were analyzed. Which temperatures are most effective in satisfying the plant's chilling requirement, the amount required by different varieties, the effects and consequences of inadequate chilling, and treatments which may ameliorate the effects of inadequate chilling were considered. Hormonal and physical and anatomical plant response changes occurring during rest were discussed.
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