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N 2 O‐Freisetzung auf gemähtem Dauergrünland in Abhängigkeit von Standort und N‐Düngung
Author(s) -
Hoffmann Ch.,
Anger M.,
Kühbauch W.
Publication year - 2001
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 - 10.1046/j.1439-037x.2001.00509.x
Subject(s) - fertilizer , nitrous oxide , frost (temperature) , nitrogen , chemistry , nitrogen fertilizer , precipitation , ammonium nitrate , ammonium , zoology , ozone , agronomy , horticulture , meteorology , biology , physics , organic chemistry
N 2 O Emissions from True Meadows Dependent on Location and N Fertilization Agricultural production is thought to be a main anthropogenic emitter of nitrous oxide (N 2 O), which contributes to global warming and the destruction of the ozone layer. There is still considerable uncertainty about the amount of N 2 O emission, and the site‐specific parameters that affect N 2 O emission. From October 1995 until March 1998 experiments were conducted at established field plots (true meadows) at three different sites, i.e. low mountain range (Eifel), lowland (Niederrhein), and moist meadows (Münsterland). Plots were fertilized with calcium ammonium nitrate (CAN) at nitrogen equivalents ranging from 0 to 360 kg N ha –1 . N 2 O fluxes were measured throughout the whole year using the closed‐chamber method. In addition, data on temperature, water‐filled pore space and precipitation were collected. N 2 O emission rates (mg N 2 O‐N ha –1 h –1 ) were highest either after fertilizer application or in winter during frost, depending on the experimental site and N dosage. The annual amount of N losses due to N 2 O emission was dependent on the experimental site and the type and dosage of fertilizer. Disregarding the 360 kg N ha –1 level of the CAN treatments, the N losses in this experiment were less than 1.5 kg N 2 O‐N ha –1 yr –1 . At low fertilizer dosage there was no reliable correlation between the amount of N that was applied and the amount of N 2 O that was emitted. However, with high fertilizer levels the N 2 O emissions increased gradually. Finally, N 2 O emissions were more influenced by the amount of CAN than by the site.