Sigma 2-4-2 Bio

With Value-Added Biologicals

Sigma’s base formula containing 100% organic and natural ingredients plus twice the concentration of biological additions compared to other dry formulas. Organic minerals such as carbon and humic acids work together to strengthen root growth and overall plant health. Apply “as is” or dry blend with conventional fertilizers to maximize performance.

Available Packaging:

50Lb.Poly Bag (22.68 KG) 2000 Lb.Totes (907 KG) Bulk Load

Guaranteed Analysis

Total Nitrogen (N) 2.0%
0.68% Water Soluble Nitrogen
1.32% Water Insoluble Nitrogen
Available Phosphate (P2O5) 4.0%
Soluble Potash (K2O) 2.0%
Calcium (Ca) 10.0%
Magnesium (Mg) 6.0%
Iron (Fe) 0.15%

Derived from processed poultry manure and bone meal.

Humic Acids 6.0%
Beneficial Bacteria 4,200,000 CFU/Lb
Endomycorrhizae 9.4 Prop/Lb.
Trichoderma 716,000 CFU/Lb

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

Application Rates



Medium: 37.5 lb. / 1000 sq ft. (0.75 lb. N)


High: 50 lb. / 1000 sq ft.(1.0 lb. N)

Golf Course

Low Rate:

25 lb. / 1000 sq ft.(0.50 lb. N)

Medium Rate:

37.5 lb. / 1000 sq ft. (0.75 lb. N)

High Rate:

50 lb. / 1000 sq ft. (1.0 lb. N)


Low Rate:

(Examples - peas, beans) Incorporate 2500 lb. per acre 2-3 weeks prior to planting.

Medium Rate:

(Examples - asparagus, beet, carrot, melon, pepper, cauliflower, broccoli, brussels sprouts, and celery) Incorporate 5000 lb. per acre 2-3 weeks prior to planting.

High Rate:

(Examples - onion, sweet corn, potato, tomato) Incorporate 6000 lb. per acre 2-3 weeks prior to planting.

Tree & Palm

Rate based on 1” of trunk diameter (caliper). Example: for 10” trunk diameter (caliper) multiply label rate by 10.


Mix with soil in bottom of holes priorto transplanting. Apply 12.5 lb. at Transplanting.


Apply 25.0 lb. at Transplanting.


Low Rate:

(for heavy substrates with porosity < 60%)


60 lb. per cubic yard of media


98 lb. per 1000 sq. ft.

Medium Rate:

(for most nursery stock and foliage plants)


90 lb. per cubic yard of media


173 lb. per 1000 sq. ft.

High Rate:

(for light substrates with porosity > 80%)


112 lb. per cubic yard of media


248 lb. per 1000 sq. ft.

Container Sizes

1 Gallon:
Low Rate: 113 gramsHigh Rate: 225 grams
2 Gallon:
Low Rate: 225 gramsHigh Rate: 450 grams
3 Gallon:
Low Rate: 338 gramsHigh Rate: 712 grams
5 Gallon:
Low Rate: 450 gramsHigh Rate: 975 grams
7 Gallon:
Low Rate: 675 gramsHigh Rate: 1462 grams
10 Gallon:
Low Rate: 825 gramsHigh Rate: 1762 grams
15 Gallon:
Low Rate: 900 gramsHigh Rate: 1875 grams
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