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Open AccessArticle

Nitrogen Transfer to Forage Crops from a Caragana Shelterbelt

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Western Applied Research Corporation (WARC), P.O. Box 89 Scott, SK S0K 4A0, Canada
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World Agroforestry Centre, ICRAF-Tanzania Programme, Dar-es-Salaam, Tanzania
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Agroforestry Development Centre, Agriculture and Agri-Food Canada (retired), P.O. Box 940, Indian Head, SK S0G 2K0, Canada
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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; https://doi.org/10.3390/f6061922
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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