Effect of different covering materials used during the pre-harvest stage on the quality and storage life of 'Sultana Seedless' grapes

Abstract

Covering the grapevine rows to delay the maturity and harvest date became widely practiced in 'Sultana Seedless' vineyards. The research work was conducted to test different cover materials (polypropylene cross-stitch, life pack, mogul and transparent polyethylene) in respect to their effects on grape quality and storability. Harvest was delayed for one month in covered plots. Harvested grapes were packed and transferred to storage rooms after pre-cooling. During packing, the grape clusters were sealed in PE bags with sulphur dioxide pads. The grapes were stored for 90 days in the first year and 120 days in the second year, at -0.5°C and 90% RH. All the grape clusters were healthy and of marketable quality after 90 days of storage period. In the first year, at the end of the storage, only those grapes harvested from the rows covered with polypropylene cross-stitch showed fungal growth. The sensory quality scores revealed a lower level of preference after 120 days of storage. The effects of the covering materials tested were similar regarding grape quality and storage performance except the transparent polyethylene that damaged the grapevine leaves.

Sofralık Sultani Çekirdeksiz Üzüm Çeşidinin Depolanmasında Farklı Kükürt Dioksit Jeneratörlerinin Etkinliğinin Araştırılması

“…patojenlerinin de olduğu saptanmıştır. B. cinerea fungusunun üzümlerde kayıplara neden olan en önemli etmen olduğu yapılan birçok çalışmada ortaya konmuştur (Sommer et al, 2002;Crisosto and Mitchell, 2002;Crisosto and Smilanick, 2004;Yıldız ve ark., 2009;Sen and Kesgin, 2014).…”

“…Tanenin saptan kopma kuvveti, tanenin salkıma bağlanma kuvvetini gösterdiğinden salkımlardaki tanelerin dökülmesiyle yakından ilişkilidir (Sen and Kesgin, 2014).…”

“…Depolama süresinin ilerlemesiyle üzümle-rin TA miktarında görülen değişimler çok sınırlı olmuş-tur. Daha önce Yuvarlak Çekirdeksiz, Razakı, Italia (Öztürk ve ark., 1997), Sultani Çekirdeksiz (Yıldız ve ark., 2009;Sen and Kesgin, 2014) ve Çeşme Pembesi, Siyah Germe, Pek Üzümü, Kırmızı Şam (İşçi et al, 2014) üzüm çeşitlerinde de depolama süresince TA miktarı-nın değişiminin sınırlı olduğu saptanmıştır.…”

Freeze Drying of Grape Raw Materials in Red Winemaking 

“…Numerous researches of the nutrition of centenarians in the southern regions have proved that 50-100 grams of dry wine per day favorably affect the body, as they are the source of a wide range of vitamins, minerals and antioxidants (Antonini et al, 2005;Stavridou et al, 2016;Johnson et al, 2006). Bioactive compounds and vitamins, which are part of the grape raw material, are unstable during storage (Baraboy, 2009;Sen and Kesgin, 2014;Crisosto and Mitchell, 2002). As a result, grape must be processed within a relatively short time after harvest.…”

Effect of climate on the quality and berry coloration of red globe grape variety with cold storage ability in Eğirdir/Isparta

“…The storage life of table grapes is influenced by the preharvest ecological conditions, fruit maturity at harvest and pre-cooling, SO 2 fumigation and storage conditions, including the temperature and relative humidity during post-harvest handling [20][21][22]. Grape deterioration during storage is characterized by weight loss, stem browning, softening, shattering and decay [23].…”