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一、落花落荚原因 1.温度。菜豆花芽分化适温为20～25℃,开花结荚期适温为18～25℃。当温度高于30℃时,易造成授粉不良,35℃以上时落花率可达90％左右。温度低于15℃时,花粉萌发率低,落花落荚增多,10℃和40℃时不易结荚。高温使花蕾发育不完全,花不能开放。
First, falling falling pod causes 1. Temperature. Bean bud differentiation suitable temperature 20 ~ 25 ℃, flowering pod temperature suitable for 18 ~ 25 ℃. When the temperature is higher than 30 ℃, easily lead to poor pollination, falling above 35 ℃ when the rate of up to 90%. When the temperature is lower than 15 ℃, the germination rate of pollen is low, the falling flower pod increases, and the pod is not easy to fall at 10 ℃ and 40 ℃. High temperature so that bud development is incomplete, flowers can not be opened.