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任何一种作物的生长发育和夺取高产都和温、光、水、气、肥、土壤有着密切的关系和相关性。然而，不同的作物对上述外部条件的临界界限要求又各不相同。如马铃薯春播时对温度的要求是：种薯块茎在地面以下１０ｃｍ的温度达７～８℃时幼芽即可生长；１０～１２℃时幼芽可茁壮成?
Any kind of crop growth and development and the capture of high yield and temperature, light, water, gas, fertilizer, soil are closely related and relevant. However, the critical requirements of different crops on these external conditions are different. Such as the spring potato when the temperature requirements are: seed tubers in the ground 10cm below the temperature reached 7 ~ 8 ℃ when the sprouts can grow; 10 ~ 12 ℃ when the sprouts can thrive?