MasterBlend 0-20-42 Bloom Formula is a water-soluble fertilizer for bloom-stage nutrient programs. This listing contains 25 lb of Bloom Formula only, not a complete multi-component nutrient kit.
A 25 lb option for ongoing production
Choose this bag when you already use this formula and need fertilizer for repeated batches or larger production systems. Plan your companion inputs separately.
Build your nutrient program
The 0-20-42 analysis supplies no nitrogen. It is not a complete standalone feed, and changing from 0-12-24 requires recalculating the program rather than substituting gram for gram. Review YaraLiva CalciNit 15.5-0-0 and Magriculture magnesium sulfate heptahydrate for your multi-part program. Both are sold separately; amounts must match the applicable formula, water analysis and crop requirements.
Mixing and application
Follow the applicable product label and a crop-specific nutrient plan. Do not apply the Tomato Formula mixing chart automatically to this different analysis. Check source-water quality and measure the mixed solution’s EC and pH; bag analysis alone does not establish a universal application rate or target EC.
Specifications
- Brand: MasterBlend
- Analysis: 0-20-42 (N–P₂O₅–K₂O)
- Form: water-soluble powder
- Contents: 25 lb bag
Store in a cool, dry location away from moisture. Keep fertilizer components separate until mixing as directed.
Documentation
MasterBlend 0-20-42 product label (PDF)
Compare formulas and sizes
1 lb size · 4 lb size · Browse MasterBlend formulas and companion nutrients
- Easy to use: Use with any calcium nitrate and magnesium sulfate to make a complete cannabis nutrient solution.
- High Analysis: 0-20-42 water soluble fertilizer complete with all essential micronutrients.
- Pure: Manufactured from the highest quality technical grade materials, MasterBlend water-soluble fertilizers for greenhouse and controlled environment agriculture provide the highest level of balanced nutrition available for flowering cannabis and hemp grown in a soil medium or hydroponic system.
- Water Soluble: High solubility, ideal for making concentrated stock solutions for automatic fertilizer injection systems.
Guaranteed Analysis:
| Total Nitrogen (N) | 0% |
| Available Phosphate (P2O5) | 20% |
| Soluble Potash (K2O) | 42% |
| Magnesium (Mg) (Total) | 0.0% |
| 0% Water Soluble Magnesium (Mg) | |
| Sulfur (S) | 9% |
| Boron (B) | 0.03% |
| Copper (Cu) | 0.02% |
| 0.01% Chelated Copper (Cu) | |
| Iron (Fe) | 0.35% |
| 0.20% Chelated Iron (Fe) | |
| Manganese (Mn) | 0.09% |
| 0.05% Chelated Manganese (Mn) | |
| Molybdenum (Mo) | 0.01% |
| Zinc (Zn) | 0.02% |
| 0.01% Chelated Zinc (Zn) | |
Plant nutrients derived from:
potassium phosphate, potassium sulfate, boric acid, copper EDTA, copper sulfate, iron DTPA, manganese EDTA, sodium molybdate, zinc EDTA
Potential Basicity:
Lbs. calcium carbonate equivalent per ton.
Maximum Solubility:
1 lb. per gallon
CAUTION: Some crops may be injured by application of Boron.
This fertilizer is to be used only on soils that respond to Molybdenum. Crops high in Molybdenum are toxic to ruminant animals.
Mixing rates:
FLOWERING plants: Mix 10.7 oz. of Master Blend 0-20-42 in 100 gallons of water, along with 14.1 oz. of calcium nitrate and 8.3 ounces of magnesium sulfate(epsom salt). For small volumes use 3-grams of Mater Blend 0-20-42- and 4-grams of calcium nitrate and 2.3-grams magnesium sulfate per gallon of final volume working solution. This will give a nutrient profile of approximately:
164ppm N - 69ppm P - 276ppm K - 60ppm Mg - 201ppm Ca - 150ppm S
2.8ppm Fe - 0.159ppm Zn - 0.238ppm B - 0.159ppm Cu - 0.079ppm Mo - 0.7ppm Mn
With an estimated EC of 2.2 mS/cm.
MasterBlend 0-20-42 Bloom Formula 25 lb.
MasterBlend 0-20-42 Bloom Formula 25 lb.
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