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调查了油松种子园、母树林良种减产的原因，主要是由于球果在生长发育过程中的大量损失；而虫害、雌花授粉不良、因缺少水肥造成的落花落果是油松球果损失的主要原因。同时提出了减少球果损失的几点技术措施。
The reasons for the decrease of elite seed production in Pinus tabulaeformis seed orchard were mainly attributed to the large loss of cones in the process of growth and development. However, pests and female flowers pollination were poor. the reason. At the same time, some technical measures to reduce the loss of cones are put forward.