农博士:现在国家号召退耕还林,我们这里的农民也按照乡里的要求种植了各种果树。但遗憾的是,我们种植的树苗成活率不是很高,技术员说问题出在苗木自身上了,我很想知道,对我们农民来说,选购果树苗要注意什么问题?河北省承德县读者王秀方 Dr. Nong: Now the country calls for returning farmland to forests. Our peasants also planted various kinds of fruit trees in accordance with the requirements of the village. Unfortunately, the survival rate of sapling we plant is not very high. The technician said the problem lies in the seedling itself. I really want to know what problems our farmers should pay attention to when buying saplings. Chengde County, Hebei Province, China Wang Xiu Fang