每一个优良树种,都有它本身的特性和适宜的生长条件,在本地表现好,引到外地条件变了就不一定表现好。引种的目的就是选出适于当地条件,生产上需要的优良品种。在引种试验中,要做到引中选、引选结合。如何进一步搞好杨树引种问题,谈谈以下三点意见,供有关同志参考。 Each good tree species, has its own characteristics and suitable growth conditions, good performance in the local, lead to changes in the field conditions may not necessarily perform well. The purpose of introduction is to select suitable for local conditions, production needs of fine varieties. In the introduction test, to be cited in the election, cited the election combination. How to further popularize the introduction of poplar and talk about the following three opinions for reference by the relevant comrades?