桑树杂种优势的利用研究始于50年代中期,70年代至80年代初筛选出一些符合育种目标的杂交组合。这些一代杂交桑(简称杂交桑,下同)具有快速、低本、高效的优势。从而开辟出适应生产需要、取代嫁接的良桑繁殖的新途径。现已在粤、皖、浙、苏、川、晋、鲁、湘、豫、鄂等10省的蚕区推广。一、主要特点生产实践证明,杂交桑的表现主要有以下几个方面。 1、产叶量高:杂交桑在长江流域地区,一般亩产叶量为2,000—2,500公斤,珠江流域则高达3,500—4,000公斤以上。据中国蚕研所、安徽和湖南等调查,丰驰杂交桑亩植500株的产叶量比湖 The research on the utilization of mulberry heterosis began in the mid-1950s. From the 1970s to the early 1980s, some hybrid combinations that met the breeding objectives were screened out. These hybrid hybrid mulberry (hereinafter referred to hybrid mulberry, the same below) has the advantages of fast, low cost and high efficiency. In order to open up to adapt to the production needs, to replace the graft of new mulberry reproduction of new ways. Now in Guangdong, Anhui, Zhejiang, Jiangsu, Sichuan, Shanxi, Shandong, Hunan, Henan, Hubei and other provinces of the sericulture promotion. First, the main features Production practice has proved that the performance of hybrid mulberry mainly in the following areas. 1, high leaf yield: hybrid mulberry in the Yangtze River Basin, the general yield of 2,000-2,500 kg per mu, while the Pearl River Basin is as high as 3,500-4,000 kg. According to the China Silkworm Research Institute, Anhui and Hunan and other investigations, Fung Chi Hybrid Sang mu 500 plantation leaves than the lake