1977年以来,我县参加了省白榆协作组的白榆选育工作,19181年春进行了示范推广工作。现将我们推广白榆优良品系的情况报告于后。一、营造优良白榆品种示范林 1977年根据“以选为主,选育引结合”的方针,对我县优树资源进行了普查。经初选、复选,共评出表型优树五株。其中我县三阳乡付村一株白榆,作为白榆中优良类型——细皮白榆得以选中。该株同五株优势木 Since 1977, our county has participated in the elm breeding of the elm in the province. In the spring of 19181, demonstration and extension work was carried out. Now we promote the excellent elm strains reported the situation. First, to create a fine Elm species demonstration forest In 1977, according to “the main choice, breeding and combining” approach, I county yucca resources were census. After the primaries, check, a total of five strains of phenotypic tree. One of my county Sanyang Township to pay a white elm, as elm in the fine type - fine white elm to be selected. The strain with the five dominant wood