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Nitrogen inputs and outputs in a small agricultural catchment in the eastern part of the United Kingdom
Author(s) -
Roberts G.
Publication year - 1987
Publication title -
soil use and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.709
H-Index - 81
eISSN - 1475-2743
pISSN - 0266-0032
DOI - 10.1111/j.1475-2743.1987.tb00725.x
Subject(s) - arable land , hydrology (agriculture) , environmental science , nitrogen , drainage basin , soil water , nitrate , spring (device) , nitrogen balance , agriculture , watershed , agronomy , ecology , geography , soil science , geology , biology , chemistry , machine learning , mechanical engineering , geotechnical engineering , cartography , organic chemistry , computer science , engineering
. Nitrate concentrations measured in an ephemeral stream draining a 170 ha clay catchment in eastern England, with about 23% arable land, were greater than 11.3 mg N 1– 1 on the resumption of flow each autumn but then declined. There was also a spring peak in two years out of seven, 1978–1984, which depend on the length of time soils was at field capacity in the preceding winter. Mean annual load measured in rain was 19 kg N ha ‐1 and loss of nitrate in the stream 34 kg N ha ‐1 . A catchment nitrogen balance suggested that inputs, which averaged 130 kg N ha yr ‐1 , were generally more than outputs, average 108 kg N ha yr ‐1 ', but gaseous losses were not taken into account.