Effect of Planting Hole on Soil Temperature beneath Film Mulch

摘要

The purpose of this paper is to clarify the relationship between planting hole on film mulch and soil temperature in radish cultivation. The experiment was conducted in a field at the Faculty of Agriculture, Kagawa University, from April 1 to June 27in 2006. In plant plots with planting holes, no obvious correlation was observed between planting hole size and the amount of net radiation, nor between planting hole size and albedo. The amount of heat exchange of the air above planting holes was largest when the planting hole diameter was 10 cm, irrespective of whether there was plant. No correlation was observed between the ratio of daily range of soil temperature at 10 cm depth and the planting hole diameter. The smallest daily range of soil temperature was observed when the planting hole diameter was 10 cm. Meteorological factors that affect the ratio of daily range of soil temperature varied depending on whether there was plant and the planting hole diameter.