A brief article about rock dust (Basalt, Azomite, Glacier). The article does not say how long it takes micro-nutrients to dissolve from the rock amendment into the soil.
Here is the article: https://www.groworganic.com/blogs/articles/how-to-use-fertilizers-rock-dust
Greensand and Kelp Meal also have nutrients and trace elements.
Here is the article: https://www.groworganic.com/blogs/articles/how-to-use-fertilizers-rock-dust
Greensand and Kelp Meal also have nutrients and trace elements.