(Continued from Part 3.)
Mineralize the Soil
Many of our soils are depleted of trace elements and micronutrients from past agricultural use. If your land was ever farmed, it’s probably got some deficiencies. While a soil test is probably a good idea so you can see the bigger picture of certain elements you might need to add, you can also address the deficiencies with broad spectrum amendments. Because they are in mineral form they don’t tend to leach from the soil, so they are available for the soil life to break them down and transport to your plants when they need them. Some examples of broad spectrum amendments are azomite, volcanic rock dusts, and Sea-90 sea salt. A sea salt like Sea-90 will be faster acting, but shorter term impacts and can leach from the soil. A volcanic rock dust will take longer to take effect, but will have a longer lasting impact and will not leach from the soil. Broad spectrum rock dust and rock form minerals do not dissolve and leach away. The only way they are dissolved and bioavailable to the plants is through the action of microbes breaking them down in the soil with acids like carbonic acid.
Rock dust is a great way to rebuild your “savings account” of minerals in the soil that will be available to your plants when they are needed. Creating a dynamic biological engine in your soil can help balance nutrients over time, but remineralizing can certainly speed up the process. The downside is this can be a more expensive intervention if you are working at scale. As an example I’ll be spreading about 4lbs per 100 sq/ft of volcanic rock dust this year, which works out to about $130 for 1,800 sq/ft of cultivated growing area. Do I need it? Probably not. Will it improve my soil, plant health, and yields? Most likely. Depending on the amount of rock dust you are adding you may not need to any more for years to come. Soil testing and growing results will help you know when a reapplication may be worth it.Continue reading“Beyond Organic: Biological Systems Gardening for Food Security – Part 4, by Hobbit Farmer”

