Add rock min­er­als to soil

Gardening Australia - - YOUR PLANNER -

If you’re an or­ganic gar­dener, you’re prob­a­bly adding com­post, ma­nures and or­ganic fer­tilis­ers to your soil on a reg­u­lar ba­sis. While th­ese can pro­vide a good sup­ply of macro nu­tri­ents such as ni­tro­gen, they of­ten lack other el­e­ments that plants need, in­clud­ing potas­sium, mag­ne­sium, sil­i­con and iron. Rock min­er­als re­store essen­tial min­er­als to soil while stim­u­lat­ing mi­cro­bial ac­tiv­ity. Var­i­ous prod­ucts are made from a blend of rocks rich in min­er­als, in­clud­ing basalt, green­stone, lig­nite, gyp­sum, rock phos­phate and gran­ite. Th­ese are ground to a fine dust, then pel­letised to make it easy to spread. Add a gen­er­ous hand­ful per square me­tre when pre­par­ing soil. The min­er­als are re­leased slowly, pro­vid­ing nu­tri­ents over an ex­tended pe­riod.

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