The interactive effects of early season temperatures, crop density and rootstock on average fruit weight of 'Golden Delicious' apple

Richard P. Marini, Robert Michael Crassweller, W. Autio, R. Moran, T. L. Robinson, J. Cline, D. Wolfe, R. Parra-Quezada

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Crop density (CD) of 'Golden Delicious' trees on three rootstocks at six locations was manipulated for four seasons to provide a range of CDs. Cumulative growing degree days (GDDs) were calculated for each season at each location. Data were subjected to multiple regression analysis to estimate average fruit weight (FW). The best model contained rootstock as an indicator variable, and the regressor variables included CD and GDD for the first 60 days after full bloom. The interaction of rootstock×CD×GGD2 was significant, so models were developed for each rootstock. FW was negatively related to CD. For M.26 and M.9, FW peaked at 675 GDD, but for G.16 FW peaked at 700 GDD. FW increased at a greater rate with increasing GDD for heavycropped trees than for light-cropped trees. For all rootstocks, FW was most affected by CD at low values of GDD.

Original languageEnglish (US)
Title of host publicationInternational Symposium on Physiological Principles and Their Application to Fruit Production
EditorsT. Robinson
PublisherInternational Society for Horticultural Science
Pages189-194
Number of pages6
ISBN (Electronic)9789462611733
DOIs
Publication statusPublished - Nov 8 2017

Publication series

NameActa Horticulturae
Volume1177
ISSN (Print)0567-7572

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All Science Journal Classification (ASJC) codes

  • Horticulture

Cite this

Marini, R. P., Crassweller, R. M., Autio, W., Moran, R., Robinson, T. L., Cline, J., ... Parra-Quezada, R. (2017). The interactive effects of early season temperatures, crop density and rootstock on average fruit weight of 'Golden Delicious' apple. In T. Robinson (Ed.), International Symposium on Physiological Principles and Their Application to Fruit Production (pp. 189-194). (Acta Horticulturae; Vol. 1177). International Society for Horticultural Science. https://doi.org/10.17660/ActaHortic.2017.1177.26