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单产低是我国老葡萄产区生产上的主要问题之一。各老区不同程度的存在树龄老、缺株多、栽植不规则、架面小等问题。1976年以来我们重点调查了张家口地区老葡萄产区。该区有老葡萄园二万余亩,平均单产只有300斤左右。通过调查认为,当地单产低与下述因素有很大关系。
Low yield is one of the main problems in the production of old grapes in China. The old areas have varying degrees of aging, lack of plants, planting irregularities and small shelving problems. Since 1976, we have mainly investigated the old grape producing areas in Zhangjiakou. The area has more than 20,000 acres of old vineyards, the average yield of only about 300 pounds. According to the survey, the low local yield has much to do with the following factors.