永胜特产──黑地梨季荣光１９８７年１０月，笔者曾参加“永胜县寒温中山区经济林木发展对象”调查。在调查中，对永胜黑地梨进行了大量的观察分析，现将有关情况简介于下。黑地梨是永胜闻名的地方优良梨种之一，其特点是：树势强健、丰产，平均株产２００公斤左右，最高... Yongsheng specialty - black pear Ji quarter glory October 1987, the author has participated in “Yongsheng County cold mountain economic forest development object” survey. In the survey, Yongsheng Haiti Pear carried out a lot of observation and analysis, the relevant briefings in the next. Black pear is famous Yongsheng place one of the excellent pear species, which is characterized by: strong tree vigor, high yield, the average yield of about 200 kg, the highest ...