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University of Arizona (1981)

Predicting dates of maximum nut size and maturity in pecans

Picchioni, Geno Anthony

Titre : Predicting dates of maximum nut size and maturity in pecans

Auteur : Picchioni, Geno Anthony

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1981

Résumé
Variation in annual phenological events of tree fruit and nut crops has been a major research problem. Predicting when important events during the growing season and maturity occur would greatly increase production efficiency. Maximum nut size of two pecans, Cavya ■itt’Lnoens’is, Koch., cv. ’Western Schley1 and ’Wichita,’ were controlled by heat accumulation. A growing degree day.model with base temperature 50 F (10.0 C) beginning at last frost produced the lowest variation at the date of maximum nut size. Average deviation from predicted dates of maximum size was 2 days for both cultivars. Years having no late frosts resulted in early maximum size. Annual differences in time of nut maturity were also heat dependent. Heat unit sums from maximum size enabled prediction of maturity dates. ’Wichita’ required more time to attain maturity but reached maximum size sooner.

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Page publiée le 29 avril 2016, mise à jour le 19 décembre 2017