Abstract
Partial regression analysis of ten years’ data showed the percent of hollow heart (HH) tubers by weight in Norgold Russet potatoes increased with an increase in number of days and rainfall between tuber initiation and plant killing, and decreased with an increase in plant population and degree day accumulation during the same period. Highly significant third order partial correlation coefficients for these variables with percent HH were: days between tuber initiation and plant killing 0.699, rainfall between tuber initiation and plant killing 0.320, plant population -0.530 and degree day accumulation between tuber initiation and plant killing -0.753. When these variables were used in a multiple linear regression model with% HH as the dependent variable the coefficient of determination (R2) was 0.72. The model was not significantly improved by including solar radiation, yield of tubers, number of tubers, or soil moisture at tuber initiation as other independent variables.
Resumen
Análisis parcial de regresión de 10 años de información mostró el porcentaje de tubérculos con corazón vacío (HH) por peso de papas Norgold Russet, aumentado con un incremento en número de días de precipitación entre el inicio y la tuberización y la destructión del follaje, y disminuido con un incremento de la población de plantas y la acumulación de grados diarios durante el mismo período.
Coeficientes de correlación parcial de tercer orden, altamente significatives para estas variables con porcentaje de HH, fueron: días entre inicio y tuberización y destrucción de follaje 0,699; precipitación entre inicio de tuberización y destrucción de follaje 0,320; población de plantas-0,530 y acumulación de grados diarios entre inicio de la tuberización y destrucción de follaje-0,753.Cuando estas variables fueron utilizados en un modelo de regresión lineal multiple, con porcentaje HH como variable dependiente, el coeficiente de determinación (R2) fue 0,72. El modelo no fue mejorado significativamente al incluir radiatión solar, rendimiento de tubérculos, número de tubérculos o humedad del suelo al inicio de la tuberización como otra variable dependiente.
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Published with the approval of the Director of the North Dakota Agricultural Experiment Station as Journal Article No. 995.
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Nelson, D.C., Jones, D.A. & Thoreson, M.C. Relationships between weather, plant spacing and the incidence of hollow heart in Norgold Russet potatoes. American Potato Journal 56, 581–586 (1979). https://doi.org/10.1007/BF02853988
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DOI: https://doi.org/10.1007/BF02853988