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Recent advances in EUF research (1980–1983)

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Summary

Both the inorganic (EUF-NO3) and organic (EUF-Norg) EUF-N fractions are subject to considerable variations which are due to N mobilization, N fertilization, N immobilization and N uptake during the vegetation period. The EUF-N fractions are also influenced by the pH and redox potential of a soil.

To predict the N fertilizer requirements it is therefore necessary to use both the fractions of EUF-NO3 and EUF-Norg.

The EUF-Norg fraction proved to be a suitable indicator for the productivity potential of a site. This EUF-N fraction has a great influence on the uptake of other plant nutrients like potassium, for example.

The availability of soil phosphorus is also indicated more precisely by a combination of the EUF-P content at 20°C (easily available P) and the quotient EUF-P-80°C/EUF-P-20°C (P resevers). The EUF-P contents needed for optimal P nutrition of crops can be assessed by means of this combination, but the yield potential should be considered as well. The same applies to the nutrient potassium.

The above combination of EUF-nutrient fractions plays an important role in the calculation of fertilizer requirements (P, Ketc.). Only the combination of easily available and reserve nutrient fractions gives information on the nutrient dynamics of a particular soil like selectivity of K sorption, P sorption, Ca-phosphate dynamics, content of CaCO3 etc..

By means of EUF it is possible to obtain information on the availability of all essential nutrients by analysis of one soil sample. It has been demonstrated for example that at equal K availability the K uptake can be very different depending on the contents of EUF-Norg. This means that close correlation between EUF-nutrient values, nutrients taken up by the plants and yield can only be obtained, when the EUF-contents of all plant nutrients are also optimal.

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Authors and Affiliations

  1. Büntehof Agricultural Research Station, Bünteweg 8, D-300, Hannover 71, Germany

    K. Németh

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Németh, K. Recent advances in EUF research (1980–1983). Plant Soil 83, 1–19 (1985). https://doi.org/10.1007/BF02182711

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