The occurrence of vesicular-arbuscular mycorrhiza in agro-ecosystems |
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Authors: | H Baltruschat H W Dehne |
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Institution: | 1. Ruhr-Stickstoff AG, Landwirtschaftliche Forschung Hanninghof, D-4408, Dülmen 2. Institut für Pflanzenkrankheiten und Pflanzenschutz, Universit?t Hannover, D-3000, Hannover 21, BRD
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Abstract: | In a long-lasting field experiment at the Research Station Hanninghof at Dülmen (Westphalia), laid out in 1971, the inoculum
potential (IP) of vesicular-arbuscular mycorrhizal (VAM) fungi of soil from winter wheat in a continuous monoculture (CM)
and in a four-years cereal crop rotation (CR, winter wheat, winter barley, winter rye, oats) was investigated from 1980 to
1982. The influence of green manure and two levels of introgen fertilization (100 and 200 kg ha−1) on VAM-IP was also assessed. It turned out that VAM is frequent also in intensively cultivated soils, but varies this with
the crop rotation system and form and intensity of fertilization. Compared to CR the VAM-IP was significantly reduced in CM.
A cumulation of this effect, with a particularly strong decrease of VAM occurred when other factors unfavourable for the symbiosis
coincided in CM. Among these factors were the use of non-mycorrhizalRaphanus sativus andBrassica napus for green manure together with a N-fertilization of 200 kg ha−1. On the other hand green manure and the higher N-fertilization resulted in less disturbance of the VAM-IP in the CR. A correlation
between VAM-IP in the soil and of wheat yields could neither be observed in the CR nor in the CM. |
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Keywords: | agricultural practices agro-ecosystems crop rotation continuous monoculture N-fertilization green manure VA mycorrhiza winter wheat |
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