Over a century ago granite rock dust was accidentally used by Julius Hensel as a fertilizer in his vegetable garden. He worked as a miller and some stones got milled while he was milling flour. As he needed to dispose of this “waste” he put it in his garden. The effect?
He sprinkled this stone meal over the soil of his garden and was surprised to note how the vegetables
took on a new, more vigorous growth. This led him to repeat the experiment by grinding more stones and applying the stone meal to fruit trees. Much to his surprise, apple trees that formerly bore wormy, imperfect fruit now produced fine quality fruit free from worms. Also vegetables fertilized by stone meal were free from insect pests and diseases. It seemed to be a complete plant food, which produced fine vegetables even in the
Why granite rock dust is a valuable fertilizer?
Granite rock dust is made of volcanic rock. That means it contains 60+ different elements, including many trace elements. Trace elements are often neglected by commercial fertilizers formulas, so adding granite rock dust to your soil will help you to grow truly nutrient dense fruit and vegetables. It is a valuable soil amendment if you want to grow high Brix food.
What is granite rock dust composition?
Granite rock dust chemical composition:
As you can see granite rock dust is quite rich in potassium, not so much in calcium, phosphorus or magnesium. Those nutrients will have to be balanced with different sources.
Some of the trace elements in granite rock dust:
Is granite rock dust Organic?
Yes, as it’s a natural, chemically unprocessed mineral product.
How much granite rock dust should you use?
How much should you use in your garden, field or pasture?
Minimum recommended application rate (for the first time) is
3 tons/acre = 14 lb/100 sq. ft. = 1.25 lb/sq. yd.
7.5 tons/ha = 750 kg/1000 sq.m = 75 kg/100 sq.m = 750 grams/1 sq.m
But a rate even 8x higher can be used, although it would have to be incorporated into the soil.