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Abstract
The drive to adopt sustainable practices in agriculture has led to the use of products that are collectively called biostimulants. However, the efficacy of these products has not yet been well established. A nine-month greenhouse study was conducted to evaluate the impact of eight biostimulants on growth of four blueberry cultivars and soil biological health. None of the plant growth and biomass parameters were significantly affected by treatment. Similarly, no significant difference was detected in leaf pigment indicators between the Control and biostimulants, with few exceptions. For example, the biostimulant Terra grow resulted in significant higher chlorophyll than the Control with the Brightwell cultivar in February. The biostimulants did not significantly affect the soil biological health parameters either except for the abundance of ammonia-oxidizing bacteria and archaea. While biostimulants are often described as being beneficial to plants and soil health, it was not consistently evident with products in this study.