New method for soil surface darkening for increasing soil temperature
B. Azadegan 1
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Department of Irrigation and Draining Engineering, University of Tehran, Tehran, Iran
Department of Agrotechnology, College of Abouraihan, University of Tehran, Tehran, Iran
Int. Agrophys. 2011, 25(2): 109–113
This paper presents a study of the effect of soil surface colouring, using natural colour made of walnut shale, on soil temperature increase. Bulk density, soil texture and volumetric moisture content were determined. Daily temperature was controlled every two hours at soil depths of 5, 10, 20 and 30 cm during five consecutive days by a laser thermometer. The results showed that colouring of the soil surface and its darkening leads to an increase in solar radiation absorption and subsequently soil surface temperature, which, in return, results in 5°C rises in average of daily temperature and 15.78 W m-2 in average of the soil heat flux at 5 cm depths, as well as an increase in soil heat storage, comparing to the index plots (uncoloured soil).