Use of crop growth anomalies for more precise soil maps | Využití růstových anomálií porostu ke zpřesnění půdních map
2011
Brtnický, M., Mendel Univ., Brno (Czech Republic) | Denešová, O., Mendel Univ., Brno (Czech Republic) | Podešvová, J., Mendel Univ., Brno (Czech Republic) | Pokorný, E., Mendel Univ., Brno (Czech Republic)
On the aerial crop photographs there are often very good visible areas with growth anomalies (different colour, canopy density, change of ripening, lodging of cereals, etc.). In the case of repeated occurrence of areas which are usually clearly delineated, there is reason to consider that these sites have different soil properties than the rest of the land. Normally this method is used in non-destructive archaeology where changes in soil properties are caused by anthropogenic activities. From the aerial photographs of spring barley crops old meanders of the River Morava were identified in Hulín area. Growth anomalies are manifested by early maturation, in some years by drying crops. The pedological survey was accomplished in areas of former river meanders and between them. Typologically soils are classified as Gleyic Fluvisols. It was demonstrated that in site of a former river bed the saturated hydraulic conductivity is six times higher than outside the bed. Porosity increases significantly with depth in the stream; outside the river channel the porosity is higher in top horizons. From the chemical properties the higher humus quality (HK / PK) was demonstrated in interfluves sites at all soil depths. Available phosphorus content was higher in interfluves sites into one meter depth in the riverbed. By respiratory tests in interfluves locations there were found increased respiration capacity, higher stability of organic matter and increasing lack of physiologically usable nitrogen. Observed differences in soil properties cannot be mapped by standard field survey methods, or pedometric methods. Using of crop aerial photographs appears to be a very good supplement tool for soil maps compilation.
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