果树年发育周期中的发育阶段性与一、二年生草本植物的发育阶段性是一致的,那么为什么果树实生苗通常不在生活的第一、二年内开花结果呢?果树实生苗是有可能在生活的第一、二年内开花甚至结果的。这类记述颇多。1972年我们得到过一年生开花的棬树、大叶桉树和沙田柚实生苗。但什么原因使果树实生苗,通常不在生活的第一、二年内开花结实呢?我们先从有关资料和在实践中得到的有关事 Fruit tree annual developmental stages of the developmental stage and biennial herbs are the same stage of development, then why the fruit tree seedlings are usually not the first or second year of life flowering results? Fruit tree seedlings are likely to live in First, two years or even flowering results. This type of account is quite a lot. In 1972 we got the annual flowering Sassafras tsumu, Eucalyptus grandiflora and pomelo seedlings. But what makes the fruit tree seedlings, usually not in the first or second years of life flowering and strong? We start with the relevant information and in practice have been related to things