ISHS Acta Horticulturae 475: VII International Symposium on Pear Growing
MODELS FOR PREDICTING FRUIT DIAMETER OF PACKHAM'S TRIUMPH PEARS |
| Authors: | S. Ortega, S. Fuentes, J.B. Retamales |
| Keywords: | fruit growth, logistic model, size prediction tables |
| Abstract:
Pear size prediction is needed for harvest and marketing management; however, pear size tables are not available for the industry in Chile. Pear diameter was investigated during three seasons (1990/91 to 1992/93) at Puente Negro (VI th Region of Chile, 34°25 S; 71°00 W), in order to develop models for predicting fruit size in pears cv. Packham's Triumph. Models for predicting pear diameter as a function of days after full bloom were developed for different sizes, using logistic and linear equations. Results indicate that the models were able to predict pear sizes with determination coefficient (r2) ranging from 0.85 to 0.97 (linear) and from 0.84 and 0.91 (logistic). Based on these results, size prediction tables were elaborated for each size by using the linear equation because it presented higher goodness of fit. Research is continuing to test models in other pear growing areas and cultivars. | |
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