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Einfluß des Zeitpunktes der K‐Düngung auf die Dynamik des nach der Gülledüngung spezifisch gebundenen NH 4 ‐N der Tonminerale *
Author(s) -
Scherer H. W.
Publication year - 1989
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/j.1439-037x.1989.tb00756.x
Subject(s) - slurry , subsoil , chemistry , topsoil , leaching (pedology) , lessivage , human fertilization , agronomy , mineralogy , soil water , environmental science , soil science , environmental engineering , biology
Influence of the time of K fertilization on the dynamics of NH 4 ‐N fixed by clay minerals after slurry application In a pot experiment with topsoil and subsoil of a luvisol derived from loess the influence of the time of K fertilization on the fixation of NH 4 ‐N supplied with slurry as well as on the leaching and the availability of NH 4 ‐N fixed by clay minerals after slurry application was investigated. The following results were obtained: In both soils K fertilization before slurry application resulted in a reduced fixation of the added NH 4 + .In the topsoil 8 % of the NH 4 + supplied with the slurry could be detected in spring as nonexchangeable NH 4 + when slurry was added in October and 13 % when slurry was added in January in the treatment K after slurry, when in the treatment K. before slurry the NH 4 + fixed after slurry application had been mobilized totally. In the subsoil 45 % of the NH 4 + fixed after slurry application in October were mobilized until spring in the treatment K before slurry and only 20 % in the treatment K after slurry. When slurry was applied in January 30 % and 12 %, respectively, were mobilized. In spite of the reduced nitrogen leaching in the treatments K after slurry yield and N uptake of grass were lower as compared to the treatments K before slurry.