Horizontal Distributions of Soil Temperatures beneath Film Mulch and Evaluation of the Mulch Effect at the Soybean Field.

Horizontal distributions of soil temperatures beneath the mulch film in a soybean field were studied in relation to the meteorological conditions.Mulching material was black polyethylene film (0.04 mm thick) with planting holes (8 cm dia.).The experimental plots were designed as follows: Co plot was not planted and not mulched, Cp plot was planted and not mulched, Mn plot was not planted and mulched, and Mp plot was planted and mulched.