PROBLEM TO BE SOLVED: To provide a cultivation method for vegetables or fruits which can stably reduce a potassium content of fruits without debasing quality, in a cultivation method for vegetables or fruits which decrease potassium content in harvested fruits.SOLUTION: In cultivation of vegetables or fruits which bear fruits for harvest in reproductive stage after vegetative stage, a cultivation method of the vegetables or fruits, which gives a nutrient containing potassium, is characterized by preparing a potassium lack duration which is the duration to give only a nutrient which dose not contain potassium.
