https://www.mdpi.com/2073-4395/13/1/275
Fulvic acid (FA), the essence and most active component in humus, is widely used as a fertilizer synergistic agent and for soil improvement.
soil nutrientsimprovementtomatofruitquality
https://www.spaders.com.au/
Farmax spaders are able to incorporate clay, stubble, green manure, fertilizer and or trace elements through the soil profile to a depth of 400mm.
soil improvementsouth australiafarmax