Provided is an agricultural and horticultural soil-covering film which effectively absorbs infrared light from sunlight, warms the soil, and does not cause an increase in the atmospheric temperature in a greenhouse or the like when used in the greenhouse or the like. The agricultural and horticultural soil-covering film has an infrared light absorption layer containing an ultrafine particle of an infrared-absorbing material, wherein the ultrafine particle of an infrared-absorbing material is a composite tungsten oxide ultrafine particle in which the ratio of the XRD peak-top intensity is at least 0.13 when the value of the XRD peak intensity in the (220) plane of a silicon powder standard sample (640c, manufactured by NIST) is 1.
