Check your product’s label for specific instructions on how much to add per square foot or meter. Make sure the product you purchase is certified organic by the Organic Minerals Review Institute (OMRI).
Mix in a pound of kelp meal per square foot of soil (about 450 grams for 9 square meters).
Check your product’s label to ensure it’s OMRI certified and for recommended amounts per square foot or meter.
Don’t use wood ash around acid-loving plants, like azaleas or blueberries.
In addition to digging greensand into your soil directly, you can also add it to your compost pile to improve the potassium content of your compost.
Adding banana peels directly to your soil will also help deter aphids. [6] X Research source
Keep in mind you’ll need to give your compost weeks or months to mature.
The results will let you know if your soil contains low, medium, optimum, or high levels of potassium, nitrogen, phosphorus, and other nutrients. Search online for a nearby university or other soil-testing lab, or contact your local extension agent.
Amending your sandy soil with manure and well-rotted compost can help prevent leaching.
If you add potassium but notice yellowing occurs or worsens, just purchase an organic calcium-magnesium supplement or magnesium sulfate. Depending on your product, you’ll either mix it into the soil or spray it onto your plant’s bottom leaves.
