Amending Long-term Stockpiled Salvaged Soil

Long-term stockpiling of soil salvaged from oil sands operations often leads to the deterioration of soil quality and poor reclamation results for disturbed land. This study assessed the efficacy of organic amendments in improving the quality and productivity of long-term stockpiled salvaged soil in Canada’s Alberta oil sands region. Dry soil samples from a 24-yr-old stockpile were placed into pots and amended with biochar, humalite, peat, and 50:50 mixtures of biochar and peat and biochar and humalite. The pots were seeded with barley and placed in a growth chamber before undergoing three crop growth cycles.

Results showed that biochar and peat increased dry matter yield by 38 and 40%, respectively, compared with the unamended soil. Humalite produced the highest N and P concentrations in plant tissue, but this did not translate to an increase in dry matter yield. Biochar and peat offer the greatest promise for improving the productivity of long-term stockpiled salvaged soil, thereby enhancing the success of reclamation of disturbed sites.