Study on Growth and Development of Pecan Fruit Based on Three Nonlinear Regression Models
Five commercial pecan varieties('Pawnee','Mahan','Caddo','Surprise'and'Baker')were used as test materials.The growth parameters of the pecan fruit were measured regularly,such as longitudinal diameter and transverse diameter,and the fruits dissected in transverse section were examined at morphological stages.Longitudinal diameter and transverse diameter were fitted by Logistical model,quadratic polynomial and cubic polynomial.The results showed that the seasonal growth of five pecan fruits performed'S'curve,and the accumulation of longitudinal diameter was always bigger than that of transverse diameter.The fitting results of cubic polynomial was better than those of Logistic model and quadratic polynomial,and the coefficient of cubic polynomial was more than 0.991,showing significant correlation with actual growth data,which proved that cubic polynomial could provide more accurate forecast for pecan fruit seasonal growth and development.The fitting equation predetermined the development stages of the fruits.Combined with the fruit anatomy results,the growth and development process of pecan fruit was revealed.
Pecan fruitFruit growth and developmentLogistic modelQuadratic polynomialCubic polynomial
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