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前言黑豆果适宜冷凉气候栽培,抗寒性强,生育期间幼叶能耐-4°～-5℃,但花期不耐低温,一般黑豆果的花蕾只耐短时间的-3.5℃,开放的花朵能耐-2.5℃,低于此温度即受伤或冻死。黑豆果一般在4月上旬萌芽,5月上旬开花,山区气候冷凉,开花偏晚,一般在5月中下旬左右。黑龙江省气候特点,每年春末有霜冻天气出现,霜冻最早出现在5月初,最晚出现在5月中下旬。山区多出现在5月中下旬,此时恰是薄皮黑豆果开花的盛期,已开的花遭到低温袭击,易受冻伤致死。
Preface Blackberry suitable for cold climate cultivation, cold resistance, young leaves during growth tolerance -4 ° ~ -5 ℃, but not tolerant to low temperature flowering, the general black bean fruit buds resistant to short-term -3.5 ℃, open flowers Capability -2.5 ℃, below this temperature that is injured or frozen to death. Black beans generally germinate in early April, early May flowering, cold mountain climate, flowering late, usually in late May or so. Climate characteristics of Heilongjiang Province, frost weather occurs every spring end of the year, frost first appeared in early May, the latest in late May. More mountainous area appeared in late May, at this time it is the blooming period of the thin-skinned black bean, which has been hit by low-temperature and vulnerable to frostbite.