The indicator of risk of water contamination by nitrate-nitrogen
Drriven by changes in agricultural production practices, nitrogen (N) inputs have increased steadily on Canadian farms. An agro-environmental indicator was developed to monitor potential water pollution by N: indicator risk of water contamination by nitrate-nitrogen (IROWC-N). The indicator links th...
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crcansciencepubl:10.4141/s06-060 2024-09-09T19:53:58+00:00 The indicator of risk of water contamination by nitrate-nitrogen De Jong, R. Yang, J Y Drury, C F Huffman, E C Kirkwood, V. Yang, X M 2007 http://dx.doi.org/10.4141/s06-060 http://www.nrcresearchpress.com/doi/pdf/10.4141/S06-060 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Soil Science volume 87, issue Special Issue, page 179-188 ISSN 0008-4271 1918-1841 journal-article 2007 crcansciencepubl https://doi.org/10.4141/s06-060 2024-07-18T04:13:36Z Drriven by changes in agricultural production practices, nitrogen (N) inputs have increased steadily on Canadian farms. An agro-environmental indicator was developed to monitor potential water pollution by N: indicator risk of water contamination by nitrate-nitrogen (IROWC-N). The indicator links the residual soil nitrogen (RSN) indicator to climate and soil conditions to assess the likelihood of N moving through the soil and out of the agricultural system. The results are assessed in terms of N lost via leached water (N lost ) and its concentration in the leached water (N conc ), with the IROWC-N risk classes based on N lost and N conc criteria. The estimated amount of N lost in Canada ranged from 5.1 kg N ha -1 in 1991 to 6.4 kg N ha -1 in 2001. N conc values remained fairly constant during the 1981 to 1996 census years (ranging from 3.7 to 4.5 mg N L -1 ), but increased sharply (27%) to 5.7 mg N L -1 in 2001 as compared with 1996. During the 1981 to 2001 period, close to 80% of the Canadian farmland area remained in the very low and low IROWC-N risk classes, but over the years 18% shifted to a higher risk class. In 2001, large areas (> 1 million ha) in the high risk IROWC-N class were found in Manitoba, southern and eastern Ontario and in Quebec. Provincial averages of N lost over 5 census years (1981, 1986, 1991, 1996 and 2001) varied from less than 5 kg N ha -1 in Alberta and Saskatchewan to more than 20 kg N ha -1 in Ontario, Quebec and the Atlantic provinces. With the exception of Manitoba, provincial N conc values did not exceed the Canadian drinking water guideline of 10 mg NO 3 -N L -1 . In each of the census years, British Columbia, Alberta and Saskatchewan had more than 70% of the farmland area in the very low and low risk classes for IROWC-N. In Ontario and Quebec, most of the farmland area was either in the low or in the high risk class. More than 50% of the farmland area in New Brunswick, Nova Scotia and Newfoundland was in the very low, low and moderate risk classes, whereas in Manitoba and ... Article in Journal/Newspaper Newfoundland Canadian Science Publishing British Columbia ENVELOPE(-125.003,-125.003,54.000,54.000) Canada Canadian Journal of Soil Science 87 Special Issue 179 188 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Drriven by changes in agricultural production practices, nitrogen (N) inputs have increased steadily on Canadian farms. An agro-environmental indicator was developed to monitor potential water pollution by N: indicator risk of water contamination by nitrate-nitrogen (IROWC-N). The indicator links the residual soil nitrogen (RSN) indicator to climate and soil conditions to assess the likelihood of N moving through the soil and out of the agricultural system. The results are assessed in terms of N lost via leached water (N lost ) and its concentration in the leached water (N conc ), with the IROWC-N risk classes based on N lost and N conc criteria. The estimated amount of N lost in Canada ranged from 5.1 kg N ha -1 in 1991 to 6.4 kg N ha -1 in 2001. N conc values remained fairly constant during the 1981 to 1996 census years (ranging from 3.7 to 4.5 mg N L -1 ), but increased sharply (27%) to 5.7 mg N L -1 in 2001 as compared with 1996. During the 1981 to 2001 period, close to 80% of the Canadian farmland area remained in the very low and low IROWC-N risk classes, but over the years 18% shifted to a higher risk class. In 2001, large areas (> 1 million ha) in the high risk IROWC-N class were found in Manitoba, southern and eastern Ontario and in Quebec. Provincial averages of N lost over 5 census years (1981, 1986, 1991, 1996 and 2001) varied from less than 5 kg N ha -1 in Alberta and Saskatchewan to more than 20 kg N ha -1 in Ontario, Quebec and the Atlantic provinces. With the exception of Manitoba, provincial N conc values did not exceed the Canadian drinking water guideline of 10 mg NO 3 -N L -1 . In each of the census years, British Columbia, Alberta and Saskatchewan had more than 70% of the farmland area in the very low and low risk classes for IROWC-N. In Ontario and Quebec, most of the farmland area was either in the low or in the high risk class. More than 50% of the farmland area in New Brunswick, Nova Scotia and Newfoundland was in the very low, low and moderate risk classes, whereas in Manitoba and ... |
format |
Article in Journal/Newspaper |
author |
De Jong, R. Yang, J Y Drury, C F Huffman, E C Kirkwood, V. Yang, X M |
spellingShingle |
De Jong, R. Yang, J Y Drury, C F Huffman, E C Kirkwood, V. Yang, X M The indicator of risk of water contamination by nitrate-nitrogen |
author_facet |
De Jong, R. Yang, J Y Drury, C F Huffman, E C Kirkwood, V. Yang, X M |
author_sort |
De Jong, R. |
title |
The indicator of risk of water contamination by nitrate-nitrogen |
title_short |
The indicator of risk of water contamination by nitrate-nitrogen |
title_full |
The indicator of risk of water contamination by nitrate-nitrogen |
title_fullStr |
The indicator of risk of water contamination by nitrate-nitrogen |
title_full_unstemmed |
The indicator of risk of water contamination by nitrate-nitrogen |
title_sort |
indicator of risk of water contamination by nitrate-nitrogen |
publisher |
Canadian Science Publishing |
publishDate |
2007 |
url |
http://dx.doi.org/10.4141/s06-060 http://www.nrcresearchpress.com/doi/pdf/10.4141/S06-060 |
long_lat |
ENVELOPE(-125.003,-125.003,54.000,54.000) |
geographic |
British Columbia Canada |
geographic_facet |
British Columbia Canada |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_source |
Canadian Journal of Soil Science volume 87, issue Special Issue, page 179-188 ISSN 0008-4271 1918-1841 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.4141/s06-060 |
container_title |
Canadian Journal of Soil Science |
container_volume |
87 |
container_issue |
Special Issue |
container_start_page |
179 |
op_container_end_page |
188 |
_version_ |
1809923408237953024 |