Ceci explique qu’aux premières dates de cueillette acceptables, les valeurs d’amidon aient été plus basses dans les pommeraies du sud de la province que dans celles situées plus au nord. Des températures basses favorisent la conversion de l’amidon en sucre et vice versa. La température des 20 jours précédant la récolte de la McIntosh et des 40 précédant celle de la Delicious et de la Northern Spy agit sur le taux d’hydrolyse de l’amidon et par là sur les valeurs de l’indice d’amidon. Les tables se sont révélées utiles pour établir la date optimale de cueillette de ces cultivars. Résuméĭes tables d’indice d’amidon modelées sur une table déjà en usage pour la variété de pomme McIntosh ont été préparées et on a ensuite apprécié leur utilité pour prédire les premières dates acceptables de cueillette des cultivars Delicious et Northern Spy.
Apple color in iodine test full#
Since the average interval from full bloom to first acceptable harvest in Ontario is 118 days for McIntosh, 132 days for Delicious and 133 days for Northern Spy, the ambient temperature beginning 98 days after full bloom for McIntosh, 92 days for Delicious and 93 days for Northern Spy must be considered when using the starch test to determine first acceptable harvest date. This resulted in low starch index readings at first acceptable harvest in the southern apple growing areas of the province and high readings in the northern areas. Low temperatures favored the conversion of starch to sugar and high temperatures the reverse. Temperatures during 20 days before the harvest of McIntosh and 40 days before the harvest of Delicious and Northern Spy influenced the rate of starch hydrolysis and thus the starch index reading. You may want to do a starch-iodine test on a potato, too. If the apple has only a little bit of purple, it is probably ripe and ready to eat. The amount of purple found on the apple after completing this test indicates the amount of starch remaining in the apple. The McIntosh, Delicious and Northern Spy starch test guides were useful for determining when these cultivars should be harvested. the apple, parts of the apple become a dark purple colour.
Apple color in iodine test how to#
Full-color plates show how to use and interpret the starch-iodine test for. Starch test guides patterned after a guide already available for McIntosh were prepared and evaluated for determining the first acceptable harvest dates of the apple cultivars Delicious and Northern Spy. Of course, reliability in using the SI method for determining apple maturity.
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