100% Organic Nutrition + Twice the Biological Load

Sigma 2-4-2 Bio is SIGMA AgriScience's flagship dry organic fertilizer — formulated with 100% natural and organic ingredients and twice the concentration of biological additions compared to standard dry formulas. Organic carbon sources and humic acids work synergistically to strengthen root architecture and overall plant health across turf, vegetables, trees, ornamentals, and specialty crop.

Guaranteed Analysis

Total Nitrogen (N): 2.0%
— 0.1% Ammoniacal Nitrogen
— 0.3% Other Water Soluble Nitrogen
— 1.6% Water Insoluble Nitrogen
Available Phosphate (P₂O₅): 4.0%
Soluble Potash (K₂O): 2.0%
Calcium (Ca): 10.0%
Magnesium (Mg): 0.5%
Iron (Fe): 0.5%

Derived from: processed poultry manure, feather meal, bone meal, and sulfate of potash.

Biological Package

• Humic Acids: 6.0%
• Beneficial Bacteria: 4,200,000 CFU/lb
• Endomycorrhizae: 9.4 Propagules/lb
• Trichoderma: 716,000 CFU/lb

Also available without the BIO Package (beneficial bacteria, endomycorrhizae, trichoderma).

Application Rates

Turf
Medium: 38 lbs (0.75 lb N) / 1,000 sq ft
High: 50 lbs (1.0 lb N) / 1,000 sq ft

Golf Course
Low: 24 lbs (0.50 lb N) / 1,000 sq ft
Medium: 38 lbs (0.75 lb N) / 1,000 sq ft
High: 50 lbs (1.0 lb N) / 1,000 sq ft

Vegetables
Low (peas, beans): 2,000 lbs/acre — incorporate 2–3 weeks before planting
Medium (asparagus, beet, carrot, melon, pepper, cauliflower, broccoli, celery): 5,000 lbs/acre
High (onion, sweet corn, potato, tomato): 5,000 lbs/acre

Trees & Palms — Rate based on 1" of trunk diameter (caliper).
Incorporation: 12.0 lbs at transplanting
Broadcast: 24.0 lbs at transplanting

Ornamentals

• Low (porosity <60%): 60 lb/cu yd incorporation | 98 lb/1,000 sq ft landscape
• Medium (most nursery stock): 90 lb/cu yd incorporation | 173 lb/1,000 sq ft landscape
• High (porosity >80%): 112 lb/cu yd incorporation | 248 lb/1,000 sq ft landscape

Container Rates

• 1 gal: 113–225 g
• 2 gal: 225–450 g
• 3 gal: 338–712 g
• 5 gal: 450–975 g
• 7 gal: 675–1,462 g
• 10 gal: 825–1,762 g
• 15 gal: 900–1,875 g

Documents

• Safety Data Sheet (SDS)
• Product Flier