Field Evaluations of Humic Products From HuminTech in Germany and Other Countries.

Three products of the Humintech Company (Germany) were tested in field experiments in Egypt, Italy and Iraq. For potato (Solanum tuberosum) in Egypt, K humate (Powhumus) increased tuber yield by 16% and total plant biomass by 9% during a 5- month growing season.  For two rice varieties (Oryza sativa) in Iraq, humic products derived from highly oxidized lignite (Leonardite, Perlhumus) improved total plant biomass by 6% and grain yield by 15% during a 170-day field study.  For kiwi (Actinidia deliciosa) in Italy, a Fe-humate complex (Humiron) alleviated Fe deficiency, as did EDDHA (another Fe chelation product), as shown by measurements of plant chlorophyll content. The fruit yield of kiwi increased 19% with Humiron addition and 30% with EDDHA addition. Other studies in four arid nations (Saudi Arabia, Turkey, Syria and Libya) showed yield increases for wheat (Triticum vulgare) , peanuts (Arachis hypogaea) and tomato (Lycopersicum esculentum) . In a high-C soil, we found no significant effects of our humic products on economic yields or plant biomass for tomato and Cabbage (Brassica olercea). The nature of the source material und the method for isolating humic substances from the source material influenced the qualities of the products and their effects on crop growth.