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Observed effects of soil humus & salt contents on the microwave emissivity of soils

Multi-temporal remote sensing techniques have been employed in order to make comparative research of microwave emissivity of soil plots with different salt and humus content. The experiment with radiometers, 6.2 and 8.0 GHz, revealed the changes in radiobrightness temperature hold a direct relationship with changes of soil aggregation after intensive irrigation. The maximum radiobrightness contrast of plots with different humus content came to 60 K and that of salted and non-salted plots - to 30 K. The analysis has shown that there is a good correlation between the diurnal changes of emissivity and the initial moisture (a soil moisture in 2-3 hours after irrigation) of plots. This will make possible to distinguish the plots with different salt and humus content under identical meteorological conditions by the remote sensing method.