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Gewählte Master / Diploma Thesis:

Vera Maria Pachtrog (2016): Soil chemical characteristics after 15 years of different tillage and rotation.
Master / Diploma Thesis - Abteilung Pflanzenbau, BOKU-Universität für Bodenkultur, pp 56. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
Soil tillage has an influence on physical, chemical and biological soil parameters. The objective of this study was to evaluate the influence of different tillage approaches on soil pH, total organic carbon content (TOC) and cation exchange capacity (CEC) as well as the vertical stratification of macronutrients, micronutrients and risk elements after 15 years for two different crop rotations. Samples were taken in eight soil layers down to 50 cm soil depth. The tillage methods applied were no-till (NT), shallow conservation tillage with a working depth of 8–10 cm (CTs), deep conservation tillage with a working depth of 20–25 cm (CTd) and conventional plough tillage (PT). Further the total contents of nutrients in the plant tissue of winter wheat, divided in straw and grain, after either sugar beet or winter wheat, within the two rotations, were analysed. The soil pH increased with depth but was not affected by tillage. The TOC content was higher in NT and CTd than in PT in the uppermost 5 cm of the soil. CEC was lowest with PT in a depth of 0–5 cm. Tillage also significantly influenced the depth distribution of total nitrogen (N), potassium (K) and phosphorus (P) leading to elevated concentrations in the top soil layer under NT. Mehlich III extractable iron (Fe) was lower for PT compared to NT in the examined layers down to 30 cm. Among the other micronutrients, only acetic acid extractable boron (B) and manganese (Mn) showed tillage influenced vertical distribution with elevated contents in NT (compared to PT) in the top soil. The differences in the contents of macro- and microelements as well as risk elements in the wheat samples could be mainly attributed to the effect of the preceding crops.

Beurteilende(r): Kaul Hans-Peter
1.Mitwirkender: Neugschwandtner Reinhard

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