Abstract
Nitrogen uptake from non-exchangeable NH +4 byLolium multiflorum and availability of fertilizer NH +4 and fertilizer NO -3 were studied in pot experiments with three different soil types. The luvisol derived from loess released considerable amounts of non-exchangeable NH +4 when cropped. In this soil fertilizer NH +4 was only weakly fixed and was as available to the crop as fertilizer NO -3 . The recovery of fertilizer NH +4 was even higher than the recovery of fertilizer NO -3 . In the fluvisol (alluvial soil) and in the cambisol (brown earth from basalt) N recovery was higher from NO -3 fertilizer than from NH +4 fertilizer. In these soils NH +4 fertilizer was strongly fixed by 2:1 clay minerals and thus less available to the grass. Particularly in the basaltic soil the content of non-exchangeable NH +4 was low and so was the release of nonexchangeable NH +4 . At the same time this soil showed the strongest fixation of fertilizer NH +4 . Release and refixation of fertilizer NH +4 in the loess soil appears to be an important feature of this soil type with a beneficial effect on soil nitrogen turnover and availability.
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Scherer, H., Mengel, K. Importance of soil type on the release of nonexchangeable NH +4 and availability of fertilizer NH +4 and fertilizer NO -3 . Fertilizer Research 8, 249–258 (1986). https://doi.org/10.1007/BF01048626
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DOI: https://doi.org/10.1007/BF01048626