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Entire Whitening of Apple Trees to Increase Chill Units in Regions of Warm Temperatures during the Fall-Winter Seasons

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American Journal of Plant Sciences 2022年第8期13卷 1100-1115页

作者： Alejandro Zermeño-González J. A. Gil-Marín H. Ramírez-Rodríguez A. I. Melendres-Alvarez M. Cadena-Zapata departamento de riego y drenaje Universidad Autonóma Agraria Antonio Narro Saltillo México departamento de Horticultura Universidad Autonóma Agraria Antonio Narro Saltillo México departamento de Maquinaria Agrícola Universidad Autonóma Agraria Antonio Narro Saltillo México

Different studies have shown that global warming and climate change have increased the planet’s temperature in different locations. For the apple-growing farmers, this may have a negative impact on the accumulations of chill units when the air temperature during the fall-winter season increases. When the entire trees are covered with a reflective material, the wood temperature may decrease. Therefore, the objective of this study was to evaluate the effect of whitening (with calcium hydroxide) the entire apple trees (Malus domestica Borkh) after defoliation, on the branches and trunks’ internal temperature (under the bark), the accumulation of chill units (CU), its effects on fruit yield and quality and the relation with the use of thidiazuron (TDZ) (inducer of budbreak). The study was conducted during the fall-winter seasons of 2019-2020 and 2020-2021. The results of this study showed that at the hours of the highest incidence of solar radiation, the internal temperature of the whitened trunks and leaves decreases up to 9°C and 6°C respectively. The accumulated CU during the time of the study, of the whitened branches were up to 81% higher than the ones recorded on the branches with no whitening;while the CU was lost at the hours of highest solar radiation (due to a high temperature) were up to 37.2% smaller. Entire tree whitening increased up to 26% of the yield per tree compared to the application of TDZ. No statistical difference in fruit quality was observed between whitened trees and those with no whitening but with the application of thidiazuron.

关键词： Malus domestica Borkh Chill Units Whitening Calcium Hydroxide Budbreak

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