Simulating soil nitrogen cycling in the Chernozemic soil zone of Canada from 1981 to 2006
The Chernozemic soils are the main soil Great Group in Western Canada (i. e., Alberta, Saskatchewan and Manitoba). They were originally covered by grassland and in the 1870 s they were converted to agricultural production. The dry weather limited this soil to a suite of crops including small grains, oil seeds, pulse and forage crops. Livestock production is also found in this large soil zone. Long -term cultivation has significantly reduced the organic matter level in these Chernozemic soils (Schnitzer et al., 2006). A long term rotation study concluded that zero -tillage produced the highest net economic return compared with conventional and reduced tillage, and summer fallow is no long required to preserve soil water moisture (Zent ner et al., 2002). However, there were few reports on soil nitrogen cycling in Cher nomic soil at a regional scale. The objective of this paper was to estimate changes of residual soil nitrogen in Chernozemic soil of Canadian farmland during a 25 year period and discuss methods to reduce soil nitrogen loss to environment.
chernozem canadian agricultural nitrogen budget fertilizer n manure n biological n2 fixation
J.Y.Yang E.C.Huffman C.F.Drury X.M.Yang R.De Jong C.A.Campbell
Greenhouse & Processing Crops Research Centre, Agriculture and Agri - Food Canada, 2585 County Road Eastern Cereal & Oilseeds Research Centre, Agriculture and Agri - Food Canada, Ottawa, Ontario, K1A0
国际会议
哈尔滨
英文
141-143
2010-07-13（万方平台首次上网日期，不代表论文的发表时间）