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果树一般在春天开花,但有的果树在秋天又开1次花,即人们常说的果树二次开花。这是什么原因呢?原来,果树的根、茎、花、果等器官的生长发育,都是受树体本身所产生的激素控制的。夏秋季节,果树花芽已经形成,但是,这些花芽受休眠激素的抑制,须到第二年春季才能开花结果。如果在夏秋季节遇到短期高温、较长时间的干旱或雨涝以及遭受红蜘蛛、蚜虫的
Fruit trees usually bloom in the spring, but some fruit trees once again open flowers in autumn, that is, people often say that fruit trees bloom again. What is the reason? It turned out that the growth and development of the roots, stems, flowers, fruits and other organs of fruit trees are controlled by the hormones produced by the trees themselves. Summer and autumn, flower buds have formed, however, these flower buds by the dormant hormone inhibition, the spring of next year to blossom. If you encounter short-term high temperatures in summer and autumn, prolonged periods of drought or rain and waterlogging, and red spider, aphid