Sigma Si (Silica)

Turf

Natural

Medium: 4 lb. / 1000 sq ft. (0.75 lb. N)

Lawns

High: 6 lb. / 1000 sq ft.(1.0 lb. N)

Golf Course

Low Rate

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

Medium Rate

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

High Rate

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

Vegetable

Low Rate

(Examples – peas, beans) Incorporate 75 lb. per acre 2-3 weeks prior to planting.

Medium Rate

(Examples – asparagus, beet, carrot, melon, pepper, cauliflower, broccoli, brussels sprout, and celery) Incorporate 125 lb. per acre 2-3 weeks prior to planting.

High Rate

(Examples – onion, sweet corn, potato, tomato) Incorporate 200 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.

Incorporation

Mix with soil in bottom of holes prior to transplanting. Apply 3.0 lb. at Transplanting.

Broadcast

Apply 6.0 lb. at Transplanting.

Ornamentals

Low Rate

(for heavy substrates with porosity < 60%)

Incorporation

15 lb. per cubic yard of media

Landscape

195 lb. per 1000 sq. ft.

Medium Rate

(for most nursery stock and foliage plants)

Incorporation

20 lb. per cubic yard of media

Landscape

35 lb. per 1000 sq. ft.

High Rate

(for light substrates with porosity > 80%)

Incorporation

30 lb. per cubic yard of media

Landscape

50 lb. per 1000 sq. ft.

Container sizes