Answer: Carrots are chloroplast vernalized long-day crops. According to the different varieties of low-temperature induction, they can be divided into ejaculate varieties, more resistant to bolting varieties and resistant varieties. The easy-to-tethered varieties can undergo flower bud differentiation when they have 4 to 5 true leaves or even 2 to 3 true leaves at the seedling stage, and then flower and bud under long-term sunshine conditions in May and June. According to research by Japanese scholars, "Kuroda Five-inch" type varieties encounter the danger of convulsions when they experience low temperatures below 10 degrees for more than 360 hours. The lower the temperature, the longer the duration of low temperature, the higher the convulsive rate, up to 90 %the above.
Prevent method:
(1) Choose varieties that are not easy to twitch;
(2) Timely sowing, if you want to sow in advance, you need to use protective facilities.
(3) Delaying convulsions when sufficient nitrogen is available.
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