Abstract
Municipal solid waste (MSW) compost is readily available in eastern Canada and may be a good source of fertility. A 3-year experiment evaluated the effects of MSW compost and fertilizer on soil fertility, elemental composition and yield of potato (Solanum tuberosum L.) grown in a sandy loam soil. Three rates of compost (MSW1, MSW2, and MSW3), one rate of fertilizer (NPK), and one mixture of 1/2 MSW1 compost and 1/2 NPK fertilizer were applied annually to plots in a three-crop rotation; each year the MSW1 rate attempted to match the rate of P applied in the NPK treatment. Mehlich-3 extracts were evaluated for 11 elements at two soil depths (0–15 and 15–30 cm). Potato shoots and roots or whole plants were assessed for 16 elements. Treatments had no consistent significant influence on marketable tuber yields although the NPK treatment produced mathematically the highest yields. After 3 years, treatments had influenced soil concentrations of K, Ca, S, Cu, Zn, and Na in Mehlich-3 extracts at the 0–15 cm depth, but only the concentration of Na at the 15–30 cm depth. The concentration of Mg in the plant tissue was consistently highest in plants fertilized with NPK; this treatment also produced higher Mn concentrations in the last 2 years. Shoot Cu concentrations were highest in the MSW3 plots. The compost did not increase heavy metal concentrations in shoot, root or whole-plant tissue and would be safe to use at agronomic rates of application.
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Acknowledgements
The authors acknowledge the financial support of the Halifax Regional Municipality, the Municipality of Lunenburg, Miller Waste Ltd and the Matching Investment Initiative Program of Agriculture and Agri-Food Canada. We also thank Ryan Ring, Irene Walsh, Sharon Sorenson and Andy Radin for their excellent technical support.
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Warman, P.R., Vernon Rodd, A. & Hicklenton, P. The Effect of MSW Compost and Fertilizer on Extractable Soil Elements, Tuber Yield, and Elemental Concentrations in the Plant Tissue of Potato. Potato Res. 54, 1–11 (2011). https://doi.org/10.1007/s11540-010-9167-9
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DOI: https://doi.org/10.1007/s11540-010-9167-9