New Zealand Journal of Crop and Horticultural Science abstracts
Effect of soil and climate conditions on soluble solids evolution
during maturation of kiwifruit
O. PAILLY
Station de Recherche Agronomique
INRA San Giuliano
F-20230 San Nicolao, France
R. HABIB
Unité de Recherche en Ecophysiologie
et Horticulture
INRA Domaine St Paul
F-84143 Montfavet cedex, France
R. DELECOLLE
Station de Bioclimatologie
INRA Domaine St Paul
F-84143 Montfavet cedex, France
Abstract The increase in soluble solids concentration (SSC)
during maturation of kiwifruit (
Actinidia deliciosa (A. Chev.) C.F.
Liang et A.R. Ferguson `Hayward') in 16 orchards of the eastern coastal plain
of Corsica was analysed in relation to soil characteristics and climate data
for 2 years (1987 and 1988). Even if time was expressed in degree days, a
year-to-year difference in SSC evolution with time was observed. A smooth
decrease in SSC in early October 1987 was noticed and may be the result of the
high rainfall which occurred during that period. Using the 1988 data set, SSC
increase was estimated as a function of time (under a quadratic form), total
soil sand level, and the inverse of soil crude silt level, meaning that soil
retention capacity probably influenced SSC increase. The derivative with
respect to time of this function was also an acceptable estimate of observed
rate of increase in SSC (RI). Observed RI, as well as calculated daily RI,
increased as mean air temperature decreased, as reported in other papers. These
equations were then tested on the 1987 data set and were also good estimates of
SSC and RI except during the high rainfall period. 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.
Keywords kiwifruit; Actinidia deliciosa; fruit
maturity; soluble solids; soil texture; temperature
New Zealand Journal of Crop and Horticultural Science, 1995, Vol. 23:
145-153
0114-0671/95/2302--0145 $2.50/0 (c) The Royal Society of New Zealand
1995
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