杨树缺锌症的防治杨树是平原及山区绿化的速生树种，每年植树造林中都被大量采用。但由于杨树在沙滩地和风沙危害区栽植易抽枝干梢，难以成材成林，许多人认为杨材虽然生长速度较快，但对立地条件要求较高，其实这种看法是不正确的。杨树生长速度快，对立地条件有一定的要... Prevention and control of poplar zinc deficiency disease Poplar is a fast-growing tree species in the plains and mountainous areas. Every year, afforestation is widely adopted. However, since poplar trees are easy to grow into branches in sandy beaches and wind-blown haz- ardous areas, many people think that although Yang grows faster but has higher requirements for on-site conditions, this view is not correct . Poplar growth speed, the opposite conditions have to be ...