红松适宜采种期的研究

以草河口红松人工林为研究对象，支用随机区组设计方法，经方差分析，不同采种期的主要种子质量指标均达到显著或极显著水平。研究结果表明：９月１５日采种与８月１０日相比，其千粒重、种仁重和出仁率分别提高了１３．６８％．５６、６５％和８．３４％，９月１５日后增加不明显；不同采种时期对种粒大小无影响；从采种效率看，９月２０日采种与８月１０日相比，球果鲜重降低了２７．８４％，种子重增加了１５６．９２％，出种率增

STUDY ON THE BEST PERIOD OF SEED COLLECTING OF KOREAN PINE

Through adopting randomized block design, the stands planted on Caohekou region was studied. The variance deviation showes that the major quality indexes reach significant different levels. The results are as follows: (1)The average weight of one thousand grain. the weight of seed kernel and the rate of kernel produce of the seeds collected on September 15 exceed 13. 68%. 56. 65% and 8. 34% respectively compared with those of the seeds colleted on August 10, and they have no increment after september 15; the different periods of seed collecting have no effects on the size of seed. (2) In the View of the efficiency of seed collecting. the average fresh weight of the sample collected on September 20 is 27. 48 %. less than that of the sample on August 10, but the seed weight and the rate of seed produce increase 156. 92% and 17. 72% respectively. Thus it Proves that the best period of seed collecting is from 15 to 20 in September.