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山楂花芽分化期较苹果、桃等树种晚,8月中旬为花芽分化高潮、几乎在同时即进行花序分化,而随后花蕾分离分化。从9月初到翌年3月未,历时约7个月,到4月间气温、地温回升后,即迅速进行小花的萼片、花瓣、雄蕊、雌蕊等分化,性器官开始成熟。兴隆地区山楂花芽分化较易县地区晚3~4天,而隆化地区又较兴隆地区晚4~5天。
Hawthorn flower bud differentiation than apple, peach and other tree late, middle of August flower bud differentiation orgasm, almost at the same time that inflorescence differentiation, and then flower bud differentiation. From early September to March the following year, lasted for about 7 months, until April the temperature, the ground temperature rose, that is, rapid sepals, petals, stamens, pistil and other differentiation, sexual organs began to mature. Xinglong area hawthorn flower bud differentiation is easier than the county area 3 to 4 days, and booming area booming area 4 to 5 days later.