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马铃薯块茎经过休眠后,在4℃时芽眼可以萌发,以12～18℃的气温为最适宜,此时根发生早、数量多、芽茁壮。茎的伸长、匍匐茎的发生和叶片扩展,要求较高的温度。块茎的膨大要求较低的夜间气温,以12～14℃最适宜。夜间气温增高则糖分向块茎的输送减少,速度减慢。块茎膨大最适宜的土温是16～18℃;土温为25℃以上时输送到块茎里的养分不用于积累,而用于芽的生长。特别是在土温较高又逢干旱的情况下,常造成芽的萌发。在土温为18～23℃,持水量60%～70%的条件下,块茎在白天可增长5克,夜间增长1克。马铃薯的发芽期生长要求黑暗,光线抑制芽伸长,促进
After the dormancy of potato tubers, buds can germinate at 4 ° C, and temperatures of 12-18 ° C are most suitable. At this time, the root occurs early and the quantity is more and buds thrive. Stem elongation, the occurrence of stolons and leaf expansion, requiring a higher temperature. Tuber enlargement requires a lower night temperature to 12 ~ 14 ℃ the most appropriate. At night, when the temperature is increased, the delivery of sugar to the tubers is reduced and the speed is reduced. Tuber enlargement is the most suitable soil temperature is 16 ~ 18 ℃; soil temperature is 25 ℃ or more nutrients delivered to the tubers are not used for accumulation, but for the growth of buds. Especially in the soil temperature is higher and in the case of drought, often caused bud germination. In the soil temperature is 18 ~ 23 ℃, the water holding capacity of 60% to 70% of the conditions, tubers can grow in the daytime 5 grams, 1 grams at night. The germination of potatoes require dark growth, light suppression bud elongation, promotion