Take a look at the special fertilizers for citrus, roses, and azaleas to name a few and you'll find that they all contain a long list of small amounts of different minerals. By using fertilizer with a large percentage of nitrogen, it will green up the vegetable leaves and vines, but the fruit and the vegetables remain small and malnourished.
Our garden had been producing well one year and the next year was a complete failure. We added our compost, weeded, and fertilized but we couldn't quite count of an abundant vegetable production.
This year we added Ironite to our garden along with our compost and regular fertilizer. The Ironite would provide the trace elements such as potash, calcium, sulfur, boron, iron, manganese, molybdenum, and zinc. It is strongly recommended by the manufacturer that the Ironite be watered in well by the consumer and not to be used when heavy rain is expected (causing run offs to streams, lakes, and ponds).
The manufacturer also claims that the Ironite contains Mercury, "a chemical known to the State of California to cause cancer and birth defects or other reproductive harm."
There is an interesting study commissioned by the Dallas Morning News about lead and arsenic in the Ironite that I urge you to read and form your own educated opinion. You'll find it at www.dirtdoctor.com/ironite-story.
To use the mineral supplement, we would have to use an immense amount of the trace elements for many many years for it to be harmful. We have used these trace elements sparingly and with great caution. We do not want to harm ourselves, the birds and the bees, and whatever else visits our garden.
The Ironite may be obtained from home improvement stores and garden centers and it is certainly a decision that you will make about using trace elements.
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