Soil Nutrient Supply in Cultivated Bush Bean–Potato Intercropping Grown in Subarctic Soil Managed with Agroforestry

Jim D. Karagatzides, Meaghan J. Wilton and Leonard J. S. Tsuji
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Jim D. Karagatzides: Engineering and Environmental Technologies, Georgian College, Barrie, ON L4M 3X9, Canada
Meaghan J. Wilton: Department of Physical and Environmental Sciences, University of Toronto, Toronto, ON M1C 1A4, Canada
Leonard J. S. Tsuji: Department of Physical and Environmental Sciences, University of Toronto, Toronto, ON M1C 1A4, Canada

Sustainability, 2021, vol. 13, issue 15, 1-16

Abstract: To address food insecurity in northern Canada, some isolated communities started gardening initiatives to reduce dependencies on expensive foods flown in to communities. From 2012–2014, soils in northern Ontario James Bay lowlands were cultivated with bush beans and potatoes, grown in sole and intercropping configurations, in an open field and an agroforestry system enclosed by willow trees. The objective of this study was to compare the supply rates of 15 plant-available nutrients in these soils using in situ ion exchange membranes. After three years of cultivation, the agroforestry site had significantly greater supply of PO 4 , Ca, and Zn and these nutrients had positive correlations with yield. By contrast, the open site had significantly greater supply of Mg, SO 4 , and B; these nutrients, and Al, had negative correlations with yield. Whilst there were no differences between sole and intercropping configurations, significantly greater supply of NO 3 , Ca, Cu, Fe, and Zn occurred early in the growing season, compared to significantly greater supply of K, SO 4 , B, and Al later in the season. Significantly greater yields have been harvested in the agroforestry site and it is suspected that the presence of a willow shelterbelt improves the microclimate and plant-available PO 4 , Ca, and Zn.

Keywords: nutrient supply rate; subarctic agriculture; agroforestry; bush bean; potato; northern agriculture management; ion exchange resins; PRS probes (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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