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Open AccessArticle

Nitrogen Transfer to Forage Crops from a Caragana Shelterbelt

Western Applied Research Corporation (WARC), P.O. Box 89 Scott, SK S0K 4A0, Canada
World Agroforestry Centre, ICRAF-Tanzania Programme, Dar-es-Salaam, Tanzania
Agroforestry Development Centre, Agriculture and Agri-Food Canada (retired), P.O. Box 940, Indian Head, SK S0G 2K0, Canada
Department of Soil Science, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK S7N 5A8, Canada
Author to whom correspondence should be addressed.
Academic Editor: Heinz Rennenberg
Forests 2015, 6(6), 1922-1932;
Received: 7 April 2015 / Revised: 13 May 2015 / Accepted: 20 May 2015 / Published: 29 May 2015
(This article belongs to the Special Issue Nitrogen and Phosphorus Nutrition of Trees and Forests)
Caragana shelterbelts are a common feature of farms in the Northern Great Plains of North America. We investigated if nitrogen (N) from this leguminous shrub contributed to the N nutrition of triticale and oat forage crops growing adjacent to the shelterbelt row. Nitrogen transfer was measured using 15N isotope dilution at distances of 2 m, 4 m, 6 m, 15 m and 20 m from the shelterbelt. At 2 m caragana negatively impacted the growth of triticale and oat. At 4 m from the shelterbelt productivity was maximum for both forage crops and corresponded to the highest amount of N originating from caragana. The amount of N transferred from caragana decreased linearly with distance away from the shelterbelt, but even at 20 m from the shelterbelt row measureable amounts of N originating from caragana were detectable in the forage biomass. At 4 m from the shelterbelt approximately 40% of the N in both oat and triticale was from caragana, and at 20 m from the shelterbelt approximately 20% of the N in oat and 8% of the N in triticale was from caragana. View Full-Text
Keywords: agroforestry; oat; triticale; 15N isotope dilution; Saskatchewan agroforestry; oat; triticale; 15N isotope dilution; Saskatchewan
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Issah, G.; Kimaro, A.A.; Kort, J.; Knight, J.D. Nitrogen Transfer to Forage Crops from a Caragana Shelterbelt. Forests 2015, 6, 1922-1932.

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