Effects of biological nitrogen fixation by faba beans (Vicia faba L.) on the nitrogen economy of the soil
1987
Huber, R. | Keller, E.R. | Schwendimann, F. (Swiss Federal Inst. of Technology, Zuerich (Switzerland). Dept. of Crop Sciences)
The effect of nitrogen fixation by faba beans (Minica and Herz-Freya) on the nitrogen economy of the soil was investigated in a transportable container installation at the experimental station of the Department of Crop Science of the ETH, Zuerich. The results were compared with those of parallel field trials and the utilisation of the remaining nitrogen in the residues of the faba beans by winter wheat, cultivated after harvesting the faba beans, was determined by 15N labelling. The faba beans1731fixed an average of 80% of their nitrogen requirements from the air. The nitrogen turnover was increased by replacing corn for silage by faba beans in the rotation but the absolute nitrogen content of the soil was not affected. The extent of the secondary effects of nitrogen remaining in the soil after the faba bean crop on the next crop of winter wheat was dependent on factors at the site as well as climatic conditions during the winter months. Utilisation of the remaining nitrogen in the crop residues was minimal (3.
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