hrvatski

Utjecaj načina obrade na značajke erozijskog nanosa na pseudogleju središnje Hrvatske

Total quantity of erosional drift was measured on pseudogley under six tillage systems in the Daruvar area. The trial involved the following tilling variants: Œ Standard plot, according to USLE, black fallow, ploughing up-down the slope;  Conventional ploughing up/down the slope; Ž No-tillage, sowing into dead mulch, weed control by total herbicides;  Conventional ploughing across of slope;  Very deep ploughing across of slope (to 50 cm); ' Subsoiling to the depth of 60 cm + conventional ploughing across of slope. The paper presents the results relating to the main physical and chemical characteristics of natural soil and erosional drift. Average samples were taken from the surface soil layer in each trial variant in order to determine the texture of natural soil. Those erosional drifts which were removed from the trial plots, and the quantity of which was sufficient, were used to determine the texture and the main chemical properties of the soil. The intention was to establish whether there is a difference between the texture and chemical properties of natural, not eroded soil and erosional drift removed from the trial plots. The results obtained point to the conclusion that erosional drift was always richer in colloids, that is to say in clay particles. Approximately the same quantity of coarse sand was recorded in natural soil and in erosional drift in all trial variants. As regards the content of fine sand, sometimes more and sometimes less such particles were determined in erosional drift relative to natural soil. In most cases, more silt particles were determined in erosional drift than in natural soil. Since more colloid fraction particles were determined in the texture of erosional drift, and since due to its large active surface the colloid fraction is the main nutrient carrier in soil, it is realistic to expect great diversity of chemical properties. A somewhat higher soil reaction value, higher humus content, higher ion exchange capacity and a larger amount of available phosphorus and potassium were regularly determined in all erosional drifts. The obtained results point to the problem of erosion as one of the main factors of environmental pollution.

erozijski nanos; fizikalne i kemijske značajke tla; obrada tla; USLE

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