玄武岩（500 克）

One 500 g pack is the basalt portion for a standard JPI Barrel Compound (Barrel Compost) batch. Use it with one complete BD 502–507 set, one 100 g pack of finely crushed eggshells, and 12.5 gallons of manure; the double-batch kit uses two of each dry ingredient with 25 gallons of manure.

Yes. Beyond its measured role in the JPI Barrel Compound recipe, basalt rock powder can be incorporated into garden soil or compost as a mineral amendment. The greenhouse experiments summarized below report positive soybean, maize, calcium, and phosphorus results for tested basalt rock powder.

In greenhouse pot experiments with soybean and maize, basalt rock powder increased plant dry mass and improved measured soil fertility, including calcium and phosphorus levels. These findings support its use as a mineral amendment in soil-building programs.

Basalt is one of the mineral ingredients in JPI Barrel Compound, alongside cow manure, crushed eggshells, and biodynamic compost preparations 502 through 507. This 500g basalt product can also be mixed into garden soil or compost as a separate mineral amendment.