To provide a freshness preserving method capable of appropriately preserving freshness of farm crops after harvesting and improving visibility of farm crops.SOLUTION: A freshness preserving method of the present invention is a freshness preserving method in which an irradiation light is irradiated onto farm crops after harvesting. The irradiation light has a first peak wavelength in a wavelength range of 400-480 nm, a second peak wavelength in a wavelength range of 500-650 nm, and a third peak wavelength in a wavelength range of 700-750 nm. The intensity of the third peak wavelength of the irradiation light is 5% or more of the intensity of the first peak wavelength of the irradiation light.SELECTED DRAWING: Figure 1【課題】収穫後の農作物の鮮度を適切に保持でき、且つ、農作物の視認性を向上できる、鮮度保持方法を提供する。【解決手段】鮮度保持方法は、収穫後の農作物に照射光を照射する鮮度保持方法である。照射光は、４００ｎｍ以上４８０ｎｍ以下の波長範囲に第１ピーク波長と、５００ｎｍ以上６５０ｎｍ以下の波長範囲に第２ピーク波長と、７００ｎｍ以上７５０ｎｍ以下の波長範囲に第３ピーク波長とを有する。照射光の前記第３ピーク波長の強度は、前記照射光の前記第１ピーク波長の強度の５％以上である。【選択図】図１
