Effect of harvesting date on fruit quality of grapefruit cv. ?Red Blush? under Jordan Valley conditions

Jalal Muhtaseb
March 2007
Fruits;Mar2007, Vol. 62 Issue 2, p107
Academic Journal
Introduction. The grapefruit tree has a long production period. In the Jordan Valley, harvest lasts from November to March. Many Jordanian farmers tend to harvest their fruit early to get high prices, regardless of its quality. Thus, the effect of the harvesting date on fruit quality of grapefruit cv. ?Red Blush? was evaluated under Jordan Valley conditions for two seasons, 2002 and 2003. Materials and methods. Fruit quality of uniform 25-year-old grapefruit cv. ?Red Blush? trees budded on sour orange rootstock was studied during the 2002 and 2003 seasons. Fruits were harvested from October 15 in both seasons with 15-day intervals with a total of eight harvests. The studied data were total soluble solids (TSS), titratable acidity (TA), the [TSS/TA] ratio and juice percentage. Results and discussion. Fruit total soluble solids and fruit juice percentages were at a minimal level during early harvesting dates and increased with time, reaching the maximum level on January 1 for TSS and January 15 for fruit juice percentage in the first season and on December 15 and February 1, respectively, in the second season, after that TSS decreased. Fruit titratable acidity values were at maximal levels during early harvesting dates (October 15) and decreased with time, reaching the minimum level on February 1 in the first season and on January 15 in the second season. The [TSS/TA] ratio ranged from 5.5 to 6.0 between January 1 and February 1 in the first season, and between December 1 and January 15 in the second season. Conclusion. Our study displayed that Jordan Valley growers are harvesting their grapefruits much too early to provide acceptable eating quality fruits to local markets.Introduction. Le pamplemoussier a une longue p?riode de production. Dans la vall?e du Jourdan, la r?colte dure de novembre ? mars. Beaucoup de producteurs jordaniens ont tendance ? r?colter leur fruit en avance afin d?obtenir des prix ?lev?s, sans prendre en compte sa qualit?. Nous avons donc ?tudi? l''effet de la date de la r?colte sur la qualit? du pamplemousse ?Red Blush? dans les conditions propres ? cette r?gion, pendant deux saisons, 2002 et 2003. Mat?riel et m?thodes. La qualit? du pamplemousse ?Red Blush? sur des arbres de 25 ans greff?s sur oranger am?re a ?t? ?tudi?e pendant les saisons 2002 et 2003. Des fruits ont ?t? r?colt?s ? partir du 15 octobre au cours des deux saisons, ? raison d?une r?colte tous les 15 jours et de huit dates de pr?l?vement. Les donn?es ?tudi?es ont port? sur l?extrait sec soluble (ESS), l''acidit? titrable (AT), le rapport [ESS/TA] et le pourcentage de jus. R?sultats et discussion. Le pourcentage de jus de fruit et le taux d?ESS ont ?t? minimaux pendant les dates de la r?colte pr?coces et ont augment? au cours du temps jusqu?? un maximum au 1er janvier pour l?ESS et au 15 janvier pour le pourcentage de jus de fruit pour 2002 et au 15 d?cembre et 1er f?vrier, respectivement, pour 2003, ensuite les taux d?ESS ont diminu?. Les valeurs d?AT du fruit ont ?t? maximales lors des premi?res dates de r?colte (15 octobre) puis elles ont diminu? avec le temps, atteignant leur minimums le 1er f?vrier en 2002 et le 15 janvier en 2003. Le rapport [TSS/TA] a vari? de 5,5 ? 6,0?entre le 1er janvier et le 1er f?vrier 2002 et entre le 1er d?cembre et le 15 janvier 2003. Conclusion. Notre ?tude a montr? que les producteurs de la vall?e du Jourdan r?coltent leurs pamplemousses beaucoup trop t?t pour fournir les fruits pr?sentant une qualit? acceptable pour leur commercialisation sur les march?s locaux.


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