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Stickstoffdynamik unter einer Mähweide auf Knickmarsch
Author(s) -
Spatz G.,
Neuhaus H.,
Pape A.
Publication year - 1992
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.1992.tb01013.x
Subject(s) - nitrogen , nitrogen balance , forage , soil water , agronomy , drainage , pasture , nitrate , denitrification , nitrogen cycle , environmental science , nitrogen fixation , ammonia volatilization from urea , chemistry , soil science , ecology , biology , organic chemistry
Nitrogen dynamics under a pasture on marchy soil The nitrogen dynamics were studied on the drainage experimental field of the former grassland research and march experimentation station of Lower Saxony. Four variants applying different nitrogen festilization regimes, from 0 up to 380 kg N/ha/a, were investigated. Nitrogen concentrations were measured by analysing soil samples from different depths for NH 4 und NO 3 contents. Balancing the nitrogen flows the N‐output in the forage, the drainage outflow, the netimmobilization, and the N‐input by fertilization, biological N‐fixation, balk deposition and animal excrements were realized. Nitrogen replacements through the soil profile and nitrate losses in the drainage outflow were relatively low. High watercarrying capacity of the soil and high water consumption by the pasture allow only small rates of displacement of nitrogen. No relevant amounts of mineral nitrogen were found in the soil during the vegetation period because of high nitrogen takeup by the plantbiomass. A certain accumulation of nitrate was observed in late autumn. The concentration however remained unrelevant with respect to goundwater polution. In the drainage water maximal 8 kg of nitrate were leached under the highest fertilized variant. The saldo of the nitrogen balance indicates considerable amounts of nitrogen being lossed by denitrification and ammonia volatilization.