Abstract
Different variants of the patchiness of irrigated fields as observed at the multispectral satellite imagery of Landsat-8 OLI (on the open soil surface and under the canopy of agricultural crops), were studied on the example of irrigated cropland of the Svetloyarsk irrigation system located in the Volgograd region. The area has a soil cover consisting of solonetz complexes of the dry steppe. The field studies were also performed. It was revealed that the patchiness of irrigated fields is mainly associated with secondary salinization or with a significant content of carbonates in the surface soil horizons. Patchiness is often accompanied by a significant decrease in yield due to the loss of crops. Since the patchiness of irrigated fields in the south of Russia has a different origin, the ground truth data are necessary for correct interpretation of remote sensing materials.
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