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甘薯为我国各地主要杂粮作物之一。但是甘藷含水分多,贮藏困难,加上黑斑病严重,种薯保存更难;因此影响栽培面积的发展。故留种技术的改良,当视为重要工作。湘西桃源县农林场,为了克服这个困难,已改用藏蔓为种的方法,其优点:(1)提早种苗生长期;(2)减少黑斑病和线虫病的传染;(3)蔓水分少较块根
Sweet potato is one of the main cereal crops in various parts of China. However, sweet potato contains more water, storage difficulties, coupled with severe black spot, seed storage more difficult; thus affecting the development of cultivated area. Therefore, the improvement of the technique of retaining seeds should be regarded as an important task. In order to overcome this difficulty, the Taoyuan County agriculture and forestry field in Hunan Province has switched to the method of possession of wild vine. Its advantages are: (1) early seedling growth stage; (2) reduction of infection of black spot disease and nematode disease; (3) Less water than the roots