The history of the research of Debrecen scholars on salt-affected soils of Hortobágy and the region is very rich and diverse. Focusing on mapping, the following stages can be distinguished, indicating the completeness of the maps and the purpose of the performed work − First, quantitative maps (Arany, 1926) for the utilization of
... the lands at 1:75,000 (Figure 1). − Second, quantitative map (Kreybig, 1943) for the utilization of the lands at 1:25,000. − Third, category map (Kreybig et al., 1935) testing the suitability of the classification system at :75,000. − Fourth, partial category map (Szabolcs, 1954), showing the reasons of unsuccessful management at 1:10,000. − Fifth, partial quantitative map (Csillag et al., 1996), showing the utility of digital sampling at 1:25,000. − Sixth, partial quantitative map (Tamás and Lénárt, 2006), showing the capacity of multispectral remote imagery at 1:100. − Seventh, partial quantitative map (Douaik et al., 2006), showing the usefulness of geostatistical mapping at 1:10,000. − Eight, national quantitative maps (Pásztor et al., 2016), showing the applicability of geostatistics for administrative purposes at 1:10,000. − Ninth, partial quantitative/category map (authors, 2019), finding the optimal methods at 1:10,000.
The environmental factors to which surplus water can be assigned (topography, soil, groundwater, vegetation etc.) can be subject to special analysis and the randomness of the occurrences can be limited. The results of these procedures are surplus water risk maps of the areas, which can be utilised in land use planning. The risk map of the resea
...rch site was created with overlaying digital category maps of the determining factors (hydraulic conductivity, convexity, critical probability of ground water level and land use).
Soil structure may be improved by adding readily decomposable organic matter. The extent of amelioration depends on the chemical build-up and decomposability of the crop residues. Three different kinds of organic matters were investigated: (1) maize stem, (2) wheat straw, and (3) maize stem & wheat straw. Comparing the aggregate stabiliz
...ing effects of the differently decomposable organic matters to each other, the expected maize stem & wheat straw (mw) > maize stem (m) > wheat straw (w) order was proved.
Changes in the physical distribution (particle size and the state stability against decomposition) of the organic carbon pool in tilled layers of Hungarian field soil under different tillage treatments were studied. Three years after starting the experiment, soil samples were fractionated (they were taken in March 2005) by their particle size a
...nd density. The treatments caused well measurable, significant effects on two fractions of intra-microaggregate organic matter (53-250μm particle-sized, well and less decomposition-resistant pools) and onto their relative rate in the organic carbon pool of the whole soil. Different tillage treatments caused different distributions in the organic matter fractions. In regularly intensely cultivated soils evolve different physical structure, particle size-distribution, which reduce the soil fertility and its resistance against outer impacts.