engleski

The soil redistribution by different tillage systems

Comparison between some chemical properties in tilled soil and in erosional drift after the three-year stationary investigations in different tillage treatments on Stagnic Luvisol in central Croatia points to the following conclusions: Soil erosion by water does not equally remove all soil particles. The removal is selective in that more of the most active, good quality particles – clay particles are taken away. In contrast, erosional drift contains more silt and clay particles than tilled soil. In all trial years, regardless of the tillage treatment and the crop grown, higher levels of available nutrients (phosphorus and potassium), more favourable soil reaction and CEC. A higher content of organic matter were recorded in erosional drifts than in tilled soil from trial methods. Removal of clay particles by erosion depletes soil of substances bound in the soil cation exchange complex. These are plant nutrients and various substances, including pollutants, both inorganic (heavy metals, potentially toxic elements) and organic (pesticide residues, polyclic aromatic hydrocarbons - PAH). Due to selective removal of soil particles, soil erosion by water gradually leads to selective distribution of plant nutrients and pollutants. This causes soil depletion of plant nutrients and pollutants in the removal zone – upper slope part, and accumulation of these substances in the zone of erosional drift sedimentation at the slope base, in valleys along watercourses and in water accumulations. The balance of these processes in different agroecological conditions has yet to be made. No-tillage, soil tillage across the slope, growing of high-density crops are recommended as efficient practices of sustainable land management on erosion endangered Luvic stagnosol in the agroecological conditions of central Croatia.

soil; tillage; erosion

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