Leonardite as a source of humic acids for crop production was discovered in the 1960's. Researchers at the US Bureaus of Mines began to experiment with applications of crushed leonardite to agricultural soils. They found that applications of the material. at rates of 100 to 2,000 per acre, increased yields of potatoes, sugar beets and other crops.
- Healthy Home Mall (link here)
Humex is a natural soil conditioner and plant bio-stimulant. Contains natural humic substances found in geological deposits that can be best described as highly compressed and preserved organic matter called leonardite. Humex will improve the physical and chemical properties of poor soil, increase nutrient availability and stimulate soil micro flora. Humex contains 12% potassium, which helps make plants more resistant to drought. Humex is good to use in conjunction with other fertilizers to increase their availability. Excellent for seed and transplants. One to two tablespoons per gallon of water is sufficient for most applications.
- Oikos Tree Crops (link here)
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