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甜菜是喜水作物,适宜冷凉气候条件,要求昼夜温差大。播种和出苗期:温度在1～2℃、吸收种子重量15%的水分时就可发芽。要求5厘米深的地温达5～6℃时即可播种,约10～15天出苗。幼苗期:需水不多,仅占全生育期耗水量的11·8～19·0%,气温达12～14℃即可。刚出土的幼苗可忍耐短期0℃或零下1℃的低温,但遇到零下3—4℃低温,即受冻害。当第一对真叶长出后耐寒力又增强,能耐长时期零下3—5℃低温,甚至在
Beet is a water-like crops, suitable for cold weather conditions, requiring large temperature difference between day and night. Seeding and seedling stage: the temperature at 1 ~ 2 ℃, 15% of the seed weight when absorbing water can germinate. Require 5 centimeters deep ground temperature up to 5 ~ 6 ℃ sowing time, about 10 to 15 days of emergence. Seedling: less water, accounting for only 11.8 ~ 19.0% of the water consumption of the whole growth period, the temperature can reach 12 ~ 14 ℃. The newly excavated seedlings can endure short-term 0 ℃ or minus 1 ℃ low temperature, but encountered minus 3-4 ℃ low temperature, that is, frost damage. When the first pair of real leaves grow after the cold resistance has increased, can withstand long periods of minus 3-5 ℃ low temperature, even in