INFLUENCE OF HUMIC SUBSTANCES ON SOIL HEALTH, FERTILIZER AND WATER-USE EFFICIENCY

 
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In continuation of my 30 years of on-farm studies on soil organic matter from different humates and compost, I have documented quantitative improvements in soil health and water-use efficiency. Research trials were established to evaluate the efficacy of different commercial humates products derived from Leonardite (highly oxidized lignite) in crop production. Data from humic acid (HA) trials showed that different cropping systems responded differently to different products in relation to yield and quality. The consistent use of good quality products in our replicated plots resulted in a yield increase from 6% to 30% over several decades.