Another factor is climate. Grape vines like Cool nights and Sunny, warm days, as these help them maintain the right balance between acid and sugar in the grapes. However, too hot weather when the grapes are maturing, near harvest times, will decrease the acid and increase the sugar and will produce a wine that may not age well. On the other hand too little sunshine will reduces the amount of grape sugar and produce a wine low in alcohol and as a result, sugar may have to be added before fermentation to rise the alcohol level. Also rain at harvest time can dilute the grapes sugar and encourage rotting thereby lowering the quality of the wine. Mechanical grapes-picking equipment can give grapes growers more control over the grapes quality than hand picking can as all the grape can be picked quickly when they all at their peak of ripeness. But if rain has spoiled some of the grape
bunches, hand picking will allow those to be by passed.
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