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Model based on temperature parameters predicts optimal harvest date for ‘Whasan’ Asian pear
서호진,Po-An Chen,Jang Hoon Song 한국원예학회 2020 Horticulture, Environment, and Biotechnology Vol.61 No.5
The optimal harvest date for ‘Whasan’ pears ( Pyrus pyrifolia ‘Whasan’), which is diffi cult to predict, is currently determinedon the basis of fi eld observations of fruit quality. To create better models for predicting pear maturation, we utilized fl oweringperiod data from the Pear Research Institute, South Korea; commercial harvest data; and daily meteorological informationfrom 2007 to 2011 to assess fi ve temperature-related parameters for inclusion in the models: (1) daily mean temperature; (2)daily maximum temperature; (3) daily minimum temperature; (4) average of the daily mean temperature and daily maximumtemperature; and (5) average of the daily mean temperature, daily maximum temperature, and daily minimum temperature. We used these parameters and the minimum coeffi cient of variation method to estimate the base temperature and constructfi ve temperature-based models for predicting harvest date. Data from 2015 to 2016 were used to evaluate the performanceof these models, as assessed by average absolute deviation, average squared error, and average absolute percentage error. Using the average of the daily mean and maximum temperatures as the variable input temperature and 9.4 °C as the basetemperature, we obtained the most accurate prediction of the optimal pear harvest date. Our model indicates that the optimalharvest date for ‘Whasan’ pear occurs at 2370 accumulated growing-degree days after full bloom.
Ho-Jin Seo,Po-An Chen,Shu-Yen Lin,Jin-Ho Choi,Wol-Soo Kim,Tzu-Bin Haung,Su-Feng Roan,Iou-Zen Chen 한국원예학회 2015 원예과학기술지 Vol.33 No.4
‘Taichung No. 2’ is a new Asian pear cultivar developed in Taiwan with low chilling requirement; however, is likely to develop internal browning disorder under low temperature storage conditions. We investigated the impact of storage time on f lesh b rowning d isorder in p ears harvested f rom 22 orchards in 2 010 a nd 2 011, and analy zed the levels o f nutrients in different fruit parts such as the peel, flesh, and core. Calcium and potassium contents were higher in the flesh and peel, respectively, of more severely browned fruits, whereas a lower magnesium content was recorded in the peel and core of these fruits. Nitrogen and potassium contents in the peel, and calcium content in the flesh were positively correlated with browning disorder severity. By contrast, the magnesium content in the core was negatively correlated with browning disorder severity. However, the nutrient contents in fruits varied between the two sampling years considered. Only the K/Mg ratio was an effective predictor of the browning disorder severity and showed a positive linear correlation in the two years. We recommend that the K/Mg ratio should be lower than 10 to avoid severe browning disorder in pears.
Seo, Ho-Jin,Chen, Po-An,Lin, Shu-Yen,Choi, Jin-Ho,Kim, Wol-Soo,Haung, Tzu-Bin,Roan, Su-Feng,Chen, Iou-Zen Korean Society of Horticultural Science 2015 원예과학기술지 Vol.33 No.4
'Taichung No. 2' is a new Asian pear cultivar developed in Taiwan with low chilling requirement; however, is likely to develop internal browning disorder under low temperature storage conditions. We investigated the impact of storage time on flesh browning disorder in pears harvested from 22 orchards in 2010 and 2011, and analyzed the levels of nutrients in different fruit parts such as the peel, flesh, and core. Calcium and potassium contents were higher in the flesh and peel, respectively, of more severely browned fruits, whereas a lower magnesium content was recorded in the peel and core of these fruits. Nitrogen and potassium contents in the peel, and calcium content in the flesh were positively correlated with browning disorder severity. By contrast, the magnesium content in the core was negatively correlated with browning disorder severity. However, the nutrient contents in fruits varied between the two sampling years considered. Only the K/Mg ratio was an effective predictor of the browning disorder severity and showed a positive linear correlation in the two years. We recommend that the K/Mg ratio should be lower than 10 to avoid severe browning disorder in pears.