organic fertilizer leonardite Energy Investment Company offers organic fertilizer leonardite for cultivation of organic products. Heavy metals in leonardite ash: we found that zinc content in leonardite ash was 46.6 μg/g; manganese – 33.1 μg/g; copper – 27.6 μg/g; nickel – 16.9 μg/g; cadmium – 0.32 μg/g; lead – 17.7 μg/g. There are also trace amounts of mercury and arsenic. Among the elements tested, iron has exceptional place, with content of 3.42 mg/g of ash. These values point to low heavy metal contents in the coals under testing; the most dangerous of them (mercury and arsenic) were found only as traces. Leonardite Performance may vary depending on external factors (weather conditions along the route, different times of the year). Changes in these indicators will be within acceptable standards, and they will be displayed in the contract. Benefits of using leonardite for the production of fertilizers: