Emission of thermal radiation by mulched soil
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Instituto di Meccanica Agraria dell' Universita di Catania, Via Valdisavoia 5, 95123 Catania, Italy
Dipartimento di Fisisca dell' Universita di Catania, Corso ltalia 57, I 95 129 Catania, Italy
Publication date: 2021-06-25
Int. Agrophys. 1994, 8(1): 17-25
The thermal radiation emitted by wet mulched soil samples having the same composition and subjected to different treatments has been measured for soil temperatures ranging from 65°C down to 58°C. For each soil sample a treatment was characterized by the shape given to the soil surface and by the transparent film used for mulching the soil. The shape was chosen among smooth surface, surface with holes of diameter 10 mm, surface with holes of diameter 6 mm. Two surfaces with holes of different diameter were geometrically similar figures, consequently the hole depths and the distances between the nearest holes were scaled in the same ratio as the hole diameters. The film was chosen among: EVA, Patilux, Polyethylene. The emissivities corresponding to the nine treatments have been measured. For each film the emissivities of soil with holes (both of diameter 10 mm and 6 mm) are greater than the emissivity of soil having a smooth surface and the difference between the emissivities of the two samples with holes is not statistically significant. Previous experiments in Soil Solarization had shown that the temperature regimes of soil samples mulched with an EVA film and having surfaces shaped as in the present experiments were pair wise remarkably different.
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