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Soil mineralizable nitrogen and soil nitrogen supply under two-year potato rotations |
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| Authors: | M Sharifi B J Zebarth G A Porter D L Burton C A Grant |
| Institution: | 1. Organic Agriculture Center of Canada, Nova Scotia Agricultural College, PO Box 550, Truro, NS, B2N 5E3, Canada 2. Agriculture and Agri-Food Canada, Potato Research Centre, PO Box 20280, Fredericton, NB, E3B 4Z7, Canada 3. Department of Plant, Soil and Environmental Science, University of Maine, 114 Deering Hall, Orono, ME, 04469, USA 4. Department of Environmental Science, Nova Scotia Agricultural College, PO Box 550, 21 Cox Rd., Truro, NS, B2N 5E3, Canada 5. Agriculture and Agri-Food Canada, Brandon Research Centre, Grand Valley Road, Brandon, MB, R7A 5Y3, Canada |
| Abstract: | Two-year potato rotations were evaluated for their effects on soil mineralizable N and soil N supply. Pre-plant soil samples (0–15 cm) collected from the potato year after seven rotation cycles were used to estimate soil mineralizable N using a 24 week aerobic incubation. Potentially mineralizable N (N 0 ) ranged from 102 to 149 kg N ha?1, and was greater after pea/white clover and oats/Italian ryegrass than after oats by an average of 35 and 22%, respectively. Labile, intermediate and stable mineralizable N pools were increased after pea/white clover compared with oats, whereas only the stable mineralizable N pool was increased after oats/Italian ryegrass. Potato plant N uptake with no fertilizer applied was greater in potato-pea/white clover compared with the three other rotations (126 vs. average of 67 kg N ha?1). Choice of rotation crop in potato production influences both the quantity and quality of soil mineralizable N. |
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