Intermediate soil temperatures of 15-18 C are ideal for tuber set. The optimum ambient daytime temperature range for potatoes is approximately 20 to 25 C depending on the light intensity. Fahrenheit above the temperature optimum. Cool night temperatures are important because they affect the accumulation of carbohydrates and dry matter in the tubers. Moisture Appropriate application of water during the growing season is crucial to optimise production of the crop.
Potatoes require a continuos supply of soil water and good soil aeration.
Having high moisture levels at the time of tuber initiation increases tuber set. Relatively low soil moisture early in the potato growth period results in increased yields by lengthening the period of high growth rate and by increasing growth rates and net assimilation. Nutrition Nitrogen is the most critical nutrient. It has the greatest effect on yield and tuber quality. GA ratio increases shoot growth and delays tuber production.