Summary
Field experiments over two years were conducted on four fields with two respectively three soil types of different rooting depth to study the relationships between EUF-N fractions in the topsoil on the one hand and grain yield and N removal by different cereal crops on the other. The following results were obtained:
A highly significant positive correlation was found to exist between N removal and ΦEUF-N contents in the topsoil measured in the summer prior to the beginning of the experiment. In both experimental years a close correlation was observed between grain yields of cereals and ΦEUF-N contents in the topsoil. The close relationship is due to ΦEUF-N contents in the topsoil being closely correlated with the readily available water capacity of the rooted soil volume. These results indicate the adequacy of a ΦEUF-N content as an index of the yield potential of a site which could be of practical significance in soil analysis.
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Rex, M., Németh, K. & Harrach, T. The EUF-N contents of arable soils as an indicator of their yield potential. Plant Soil 83, 117–125 (1985). https://doi.org/10.1007/BF02182721
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DOI: https://doi.org/10.1007/BF02182721