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Abstract
In field experiments conducted in 1981 on deep loess soils a significant correlation was obtained between ΦEUF-N content in the topsoil and N in sugar beet roots as well as in whole plants. A very close correlation was found to exist between ΦEUF-N values in June 1981 and α-amino N in sugar beet roots at harvest. Also other quality criteria such as the contents of sugar, K and Na in roots and yield parameters correlated with ΦEUF-N contents in topsoils. The inorganic and organic EUF-N fractions changed during the vegetation period due to both N uptake by the crop and mineralization. Therefore it appears to be expedient to use both fractions when calculating N fertilizer requirements. The correlation between ΦEUF-N (topsoil samples drawn in the year preceding sugar beet) and sugar yield increases obtained by N fertilization that was found in Austria12 was confirmed in our experiments with soils from Southern Lower Saxony.
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