纽荷尔脐橙冷藏的最适采收期

以纽荷尔脐橙为原料，研究不同时期采摘果实耐贮性，通过分析品质、腐烂和冷害发生规律，确定冷藏脐橙最佳采收期。结果表明：贮藏结束时，脐橙糖酸比上升，而总糖、可滴定酸（titratable acid，TA）和VC含量均显著下降。在2012年10月下旬和11月上旬采摘的果实，鲜果和贮藏果有机质含量均较低，至贮藏结束，总糖、TA和VC含量均减少，且以TA含量下降最为明显。11月下旬到12月上旬采摘的果实，至贮藏结束时，TA和VC含量降低，但相比其他组的果实下降率最低。12月中旬之后采摘的果实，品质方面与11月下旬到12月上旬采摘的果实差距不大，但果实腐烂率高达9.67%。研究表明，冷藏的纽荷尔脐橙最适采摘期为11月中旬到12月上旬。

Optimal Harvesting Time for Cold Storage of Newhall Navel Orange

The effects of different harvesting times on postharvest quality, decay rate and chilling injury of Newhall navel
orange (Citrus sinensis Osbeck) during storage at low temperature were studied to determine the optimal harvesting time
for cold storage of navel orange. The contents of otal soluble solids (TSS), total sugar, titratable acid (TA) and vitamin C
(VC), total sugar/TA ratio, ,chilling injury index, weight loss rate and decay rate were determined. At the end of storage, an
increase in total sugar/TA ratio was observed in fruits from all harvesting times, whereas the contents of total sugar, TA and
VC decreased significantly at the same time. The content of TA decreased sharply and chilling injury index was higher in
fruits harvested in late October and early November, 2012. The quality of fruits harvested between late November and early
December was maintained well. Conversely, harvesting time had a clear influence on decay rate with 9.67% of decay in fruits
harvested at mid-December versus 0.67% in fruits harvested in late October. These results indicated that a period between
the mid-November and early December could be the optimal harvesting stage for cold storage of Newhall navel orange.