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Gewählte Doctoral Thesis:

Tsolmon Nyamdavaa (2016): Effects of Pre-crop and Manure Application on Potato Production in a Field Experiment.
Doctoral Thesis - Institut für Ökologischer Landbau (IFÖL), BOKU-Universität für Bodenkultur, pp 110. UB BOKU obvsg FullText

Data Source: ZID Abstracts
The effect of different preceding crops on the agronomic performance of potato was investigated in an organic farming system in eastern Austria. Factorial field trials were carried out in three growing years (2009 - 2011) in order to examine the impact of preceding crops, catch crops and manure application on (i) subsequent potato yield and quality, (ii) soil water and inorganic nitrogen availability and (iii) the nitrogen use efficiency under organic management. Treatments included three different preceding crops viz. lucerne, field pea and spring barley, two treatments with / without catch crops as green manure and two treatments with / without farmyard manure application. A factorial experiment was laid out as randomized complete block design in split-split plot arrangement with four replications twice in two consecutive years. The overall tuber yields and tuber starch content of potato remained significantly (P < 0.01) less in 2010 than in 2011. Tuber yields under organic management were equal whether leguminous or cereal preceding crops were used on this site with a highly fertile chernozem soil. The catch crops as green manures significantly (P < 0.01) increased the percentage of a large sized tuber (> 65 mm in diameter). Tubers contained very few internal defects in both years. Soil inorganic nitrogen contents in 0 – 30 cm soil depth at pre-planting (in March) and during growing period were highly variable among years. Catch crops had a significant effect on soil mineral nitrogen availability for different soil layers at the early growing season of the following year. Nitrate nitrogen content tended to decline with increasing soil depth in the profile for plots with catch crops. Potato tuber nitrate N accumulation showed no significant differences due to either catch crops or manure fertilization. Nitrogen use efficiency (NUE) in manure-applied plots was very similar for with and without catch crop treatments.

Betreuer: Friedel Jürgen Kurt
1. Berater: Kaul Hans-Peter
2. Berater: Freyer Bernhard

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