HEAT FLUX IN SANDY SOIL AND ITS RELATIONS WITH SOIL AND AIR TEMPERATURE | ||
| Fayoum Journal of Agricultural Research and Development | ||
| Article 2, Volume 31, Issue 1, January 2017, Pages 15-30 PDF (720.85 K) | ||
| Document Type: Research articles. | ||
| DOI: 10.21608/fjard.2017.191227 | ||
| Authors | ||
| El-Raies , S.A.A.; Azza R. Abdel-Hamed; S.E.M. El-Sisi | ||
| Soil, Water and Environment Agriculture Research Center, Giza | ||
| Abstract | ||
| A heat flux plate was installed at 0.05m depth and thermo wires were installed at 0.05 and 0.3m depths in sandy soil with grasses of the surface at Ismailia Agriculture Research Station. Data of soil heat flux (G) (W/m2) and soil temperatures were recorded every fifteen mints to represent 96 readings/day and air temperatures (oC) were recorded every one hour. Finally, twenty four values for soil heat flux, soil temperatures were calculated and air temperature were recorded along a year. The objectives must study the soil heat flux at 0.05m depth and its relation to soil and air temperature. Also to calculate heat flux at 0.3m depth and determined the relation between G at 0.05m and G at 0.3m. The obtained results showed that soil heat flux values (W/m2) at 0.05 m depth were higher at the day time with their peaks were at the mid day. The values became negative at night and early morning in the months of December, January, February and March, while the values became positive and low at early morning in the other months. Soil heat flux had been affected by both soil and air temperatures. The temperatures of air were more effective than soil temperatures of all months except for May and June. While, in March both temperatures had more or less similar effect on soil heat flux. The correlation coefficients and regression equations were significant between soil heat flux and either soil or air temperatures during the tested period. The values of calculated soil heat flux (G) at 0.30 m depth were less than those of measured soil heat flux (G) at 0.05 m,inspite of the significant values of correlation and regression between each other. | ||
| Keywords | ||
| Soil heat flux (G) (Wm2); soil temperature (oC); Air temperature (oC) | ||
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