Slow-release nutrient amendments, particularly those from plants and animal sources, are becoming increasingly popular in greenhouses and in certified organic farming. Depending on what material is being used, these amendments can vary in the amount, timing and balance of nutrients released. This makes managing soil fertility very challenging if you are a gardener, farmer or greenhouse operator.

University of Guelph research is optimizing application methods of root-growth stimulants to ensure plants are well-anchored in the pot.

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