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黑豆是果树中比较耐寒抗寒的树种,但在不同的物候期中耐寒扰寒性有所变化。在休眠期,虽气温很低,而抗寒性确很强,渡过休眠期后(春天),耐寒抗寒却降低,故我省栽培的黑豆常遭受春霜的冻害,造成减产减收。黑豆生育期短,解除休眠期早。我省早春气温低,就是气温回升转暖后,又常出现回寒,使黑豆萌动的花芽或开的花受霜冻,严重时使全部的花芽受
Black beans are more cold hardy trees in the fruit trees, but in different phenophase cold resistance changes in the cold. During the dormant period, although the temperature is very low, the cold resistance is indeed very strong. After the dormant period (spring), cold hardiness and cold resistance are reduced. Therefore, the black bean cultivated in our province is often subjected to frost damage of spring frost, resulting in the decrease of yield and yield. Black bean growth period is short, lift dormancy early. Low temperature in early spring in our province, is the temperature warmer, and often appear back to the cold, black bean sprouting flower buds or flowers frost, so that when all the buds of the flower bud