柑桔的嫁接苗一般要四、五年甚至七、八年才能开花结果。加之我省五年左右一小冻,十年左右一大冻,严重地影响着柑桔生产的发展。在这些纬度高、常受冻害威胁的地方,既要考虑研究枯树安全越冬问题,又要研究在两次大冻之间的间隙如何尽快抓收入的问题,即常说的早结丰产问题。根据我们几十年的观察、摸索,发现冻后枳砧回蔸苗上,在高部位补接的要比低接的投产早,树冠紧凑、矮小。同时又发现,桔树全株被冻死的,主要是主干的皮层被冻裂而导致死亡的。基于以上情况,我们进行了枳高砧桔苗超高密度密植早结丰产试验。 Grafted citrus generally four or five years or seven or eight years to blossom results. In addition, a frozen in about five years in our province, a major freeze in about ten years, seriously affected the development of citrus production. In these high latitudes, often threatened by the threat of frost, we must consider studying the problem of dead trees overwintering, but also to study how the gap between the two frozen as soon as possible to grasp the income issue, that is often said that the problem of early termination of high yield. According to our decades of observation, exploration and found that after the frozen back Au Putip seedlings, the higher part of the complement to take over than the low production, crown compact, short. At the same time, it was found that the whole plant of the orange tree was frozen to death, mainly because the main cortex was frozen and cracked, leading to death. Based on the above, we conducted a high-density orange lotus root anaerobic high-density close planting early yield test.