Common Trade Names: Silico-Humate, Si-Humate, Silicon-Enhanced Humic Acid, Potassium Humate with Soluble Silicon
1. General Description
Silicon Humate is a water-soluble organo-mineral fertilizer and soil conditioner produced by the alkaline extraction of leonardite (oxidized lignite) followed by complexation with soluble silicon (typically in the form of potassium silicate). It combines the beneficial properties of humic and fulvic acids with plant-available silicon. The product significantly improves plant resistance to biotic and abiotic stress, enhances nutrient uptake, strengthens cell walls, and improves soil structure.
2. Physical and Chemical Properties
Property
Specification / Typical Value
Appearance
Dark brown to black free-flowing powder or granules
Odor
Slight earthy odor
Bulk Density
0.55 – 0.75 g/cm³ (powder)
pH (1% solution in water)
9.0 – 11.0
Solubility in water
≥ 98 % (20 °C)
Total Humic Substances
≥ 65 % (w/w) (as dry matter)
– Humic Acids
≥ 50 %
– Fulvic Acids
10 – 20 %
Silicon (as SiO₂, plant-available)
8 – 12 % (typically 10 %)
Potassium (as K₂O)
10 – 14 %
Moisture (max.)
≤ 12 %
Ash content
≤ 20 %
Heavy Metals (Pb, Cd, As, Hg)
Below EU and US regulatory limits for fertilizers
3. Nutrient Content
Component
Content (% w/w)
Total Humic Extract
65 – 80
Humic Acids
50 – 70
Fulvic Acids
10 – 20
Soluble Silicon (SiO₂)
8 – 12
K₂O (soluble)
10 – 14
Organic Matter
≥ 75
4. Benefits and Mode of Action
Supplies plant-available monomeric silicic acid (H₄SiO₄) that is deposited as amorphous silica in cell walls → increased mechanical strength and resistance to lodging, pests, and fungal diseases.
Stimulates root development and nutrient uptake (especially P, Fe, Zn, Mn) through humic acid chelation and soil cation exchange improvement.
Enhances drought and salinity tolerance by improving water-holding capacity and osmotic regulation.
Buffers soil pH and reduces aluminum toxicity in acidic soils.
Acts as a natural biostimulant, increasing chlorophyll content and photosynthetic efficiency.
5. Recommended Application Rates
Crop / Use
Foliar Spray (g or kg/100 L water)
Fertigation / Soil Drench (kg/ha)
Timing / Frequency
Cereals, maize
150 – 300 g
2 – 5
Tillering + stem elongation + heading
Vegetables (tomato, cucumber)
200 – 400 g
3 – 8
Every 10–14 days during vegetative & fruiting
Fruit trees (apple, citrus)
300 – 600 g
5 – 15
Pre-flowering, fruit set, fruit growth
Potato
200 – 400 g
4 – 10
Tuber initiation + bulking
Turf & ornamentals
200 – 300 g
3 – 6
Every 2–4 weeks
Seed treatment
0.5 – 1.0 % solution
—
Soaking or coating
6. Compatibility
Compatible with most water-soluble fertilizers, fungicides, and insecticides.
Avoid mixing with strongly acidic products (pH < 5) or high-calcium solutions that may precipitate silica.
Jar test recommended before tank mixing.
7. Packaging
1 kg, 5 kg, 10 kg, 25 kg multi-layer paper bags with PE liner
500 kg or 1000 kg big bags
Custom packaging available
8. Storage and Shelf Life
Store in a cool, dry, well-ventilated area away from direct sunlight.
Keep container tightly closed when not in use.
Shelf life: minimum 5 years from production date when stored properly.
9. Safety and Handling
Non-toxic, non-hazardous, non-flammable.
Wear dust mask and gloves when handling powder to avoid inhalation and skin irritation.
In case of eye contact, rinse immediately with plenty of water.
