近几年来各地普遍反应核果类种核层积后不易出苗。其主要原因可能有两点:第一,上冻前层积的种子用水浸泡的时间不够,种仁没能充分吸水,在种仁较干燥的条件下层积的种核不易开裂,影响出苗;第二,层积的温度不适当,常规下,种子需经0—5℃的低温处理(沙藏处理)一段时间,才能发芽,北方均利用自然低温进行层积,地温可降至-20℃以下,温度过低也不利于种子发芽。下面就此问题介绍两种简易的层积方法。 In recent years, it has been reported that the nucleolus is not likely to emerge after nuclear stratification. The main reason may be two points: First, the pre-frozen stratified seeds immersed in water for less than enough time, the seeds did not fully absorb water, seed in the more dry conditions laminated seed kernel is not easy to crack, affecting the emergence; second , Stratification temperature inappropriate, under normal conditions, the seeds need to be 0-5 ℃ low temperature treatment (sand handling) for a period of time before germination, the north are natural low temperature stratification, ground temperature can be reduced to below -20 ℃, Low temperature is not conducive to seed germination. The following is a brief introduction of two simple methods of stratification.