Abstract
The efficiency of different nitrogenous fertilizers under forced leaching conditions was determined in pot experiments using ryegrass as an indicator plant in a sandy loam soil. Treatments were: ON (unfertilized), AN (ammonium nitrate), U (urea), DAP (diammonium phosphate), T (Triabon), FK (Floranid Komplett) and CDU (crotonylidendiurea).
N source effects on N uptake, and N leached (as % of N applied) were evaluated. Results show that the fertilizers which behaved best with regard to N uptake were FK followed by Triabon and AN. The most soluble fertilizers, AN and urea, gave the highest N leaching losses.
Significant correlations between EUF-NI (rapidly soluble fraction) and leaching, as well as between EUF-N (I + II) and N uptake by the plant (where EUF-N II relates to the slowly soluble fraction) were obtained.
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Vallejo, A., Cartagena, M.C., Rodriguez, D. et al. Nitrogen availability of soluble and slow release nitrogen fertilizers as assessed by electroultrafiltration. Fertilizer Research 34, 121–126 (1993). https://doi.org/10.1007/BF00750106
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DOI: https://doi.org/10.1007/BF00750106