【摘要】 本文通过对油松球果生命史的调查,掌握了油松球果在其生长发育过程中的损失情况。提出了一整套促进油松种子园种子丰产的综合技术,使良种产量由原来的平均11．5 kg／hm2提高到26．0 kg／hm2。更多还原

【Abstract】 The life cycle P. tabulae formis cone was investigated and the loss of cones in the process of growth and development was learned. Based on that, a set of comprehensive measures to promote the cone-bearing was put forward, having the yield of seed increased from the previous 11.51 kg/hm2 to 26. 0 kg/hm2.更多还原