Articles
RELATIONSHIP BETWEEN MEAN AIR TEMPERATURE AND SOLUBLE SOLIDS EVOLUTION DURING MATURING OF KIWIFRUIT IN ORCHARD
Article number
444_75
Pages
493 – 500
Language
Abstract
In a former paper (Pailly et al., 1995), the soluble solids concentration (SSC) during maturation of kiwifruit (Actinidia deliciosa (Hayward)) in 16 orchards of Corsica was analyzed in relation to soil characteristics and thermal time (time expressed in degree day, base 0°C) for 2 years (1987 and 1988). We also showed that the derivative with respect to thermal time of this function (fitted on the 1988 data set) was an acceptable estimate of observed rate of increase in SSC (RI) in 1988. In addition, observed RI, as well as calculated daily RI, increased linearly as mean air temperature decreased, as reported in other papers.
In the present paper, we tested these equations on 17 other orchards in the 1989 season.
The actual regression between observed and calculated RI has a lower slope and a higher intercept.
This is probably due to the fact that September 20, taken as the origin of degree day accumulation, was not the best choice to predict SSC evolution and RI that year.
In return, the actual regression between observed RI and mean air temperature is very similar to the 1988 equation.
Using the 1987 data set, calculated RI were good estimates of observed RI. However, the relation between RI and mean temperature was not consistent in 1987 since, in late October, increasing RI were observed with increasing temperature.
This suggests that increasing SSC during maturation may not only be the result of starch hydrolysis but more probably the balance between complex physiological processes depending on temperature conditions and the time at which they occur during maturation.
In the present paper, we tested these equations on 17 other orchards in the 1989 season.
The actual regression between observed and calculated RI has a lower slope and a higher intercept.
This is probably due to the fact that September 20, taken as the origin of degree day accumulation, was not the best choice to predict SSC evolution and RI that year.
In return, the actual regression between observed RI and mean air temperature is very similar to the 1988 equation.
Using the 1987 data set, calculated RI were good estimates of observed RI. However, the relation between RI and mean temperature was not consistent in 1987 since, in late October, increasing RI were observed with increasing temperature.
This suggests that increasing SSC during maturation may not only be the result of starch hydrolysis but more probably the balance between complex physiological processes depending on temperature conditions and the time at which they occur during maturation.
Publication
Authors
O. Pailly, R. Habib, R. Delécolle
Keywords
Online Articles (122)