利用直升飞机上安装空中采集耙,能够从狭窄的树冠上大量采集球果,既保证质量,又迅速而经济。地面人工采集球果速度较慢,采集者往往需要登山涉水,披荆斩棘,爬上高树。直升飞机采种的优越性是显而易见的,但必须周密计划,并对球果生长发育的情况进行监测。空中采集时直升飞机驾驶员把采集耙降至树梢上空,10—20英尺的梢部便处在操作 The use of helicopters to mount aerial harrows allows the collection of large quantities of cones from narrow canopies to ensure quality, as well as speed and economy. Artificial ground collection slower cones, collectors often need to mountaineering wading, cloned, climbed high trees. The advantages of helicopter seed collection are obvious, but must be carefully planned and monitored for the growth and development of the cones. During aerial capture, the helicopter pilot lowered the harvesting rake above the treetops and the 10-20 foot tip was in operation