Sustane 16•4•8 180 Day Controlled Release + Organic

16 4 8MED50lb 600wide
Label Spec Sheet MSDS

Natural Base + Coated Controlled Release Fertilizer

Designed for Professional Nursery, Greenhouse and Landscape Applications
180 - 210 Day Nutrient Release at 70º F (21º C)


Suståne 16-4-8 was developed as a combination fertilizer to provide nursery stock with a time-released 4-1-2 nutrient package blended with a 50% Suståne humus-rich, premium natural base. Suståne 16-4-8 Nursery Fertilizer is available in both 180-day and 120-day release profiles to meet the needs of your production cycle. Suståne 16-4-8 Nursery Fertilizer is derived from aerobically composted turkey litter, polymer-coated urea, polymer-coated MAP, and polymer-coated potassium nitrate.

Recommended Use:

Suståne 16-4-8 is perfect for the production of perennials and woody ornamentals. Nursery producers can use Suståne 16-4-8 to grow beautiful Azalea, Holly, Weigelia, Crape Myrtle, Cotoneaster, Boxwood, Spiraea, Salvia, Hibiscus, and Daylily.

Features of Suståne 16-4-8:

  • Suståne 16-4-8 provides a 6-7 month nutrient release in containers.
  • Suståne Natural Base + CRF produces predictable results, dependable performance, and high-quality plants.
  • Designed, tested, and proven to provide equal or superior growth results compared to similar formulations (4-1-2 ratio) of nursery industry standards.
  • Suståne Natural Base + Controlled Release Fertilizers (CRF) is the new generation in environmentally friendly plant nutrition with minimal impact on the non-target environment.
  • Enhances soil-plant nutrient exchange increasing uptake efficiency.
  • Low burn potential, nutrients release gradually over time.
  • Suståne® 16-4-8 supplies all primary, secondary, and micronutrients required for complete plant photosynthesis.

Benefits of Suståne 16-4-8

  • Rich in humic acids
  • Increases the nutrient and water holding capacity of the soil
  • Strengthens plants tolerance against hot dry conditions
  • Promotes greater root development
  • Improves buffering against changes in soil pH
  • Increases the soil’s ability to suppress plant pathogens
  • Increases soil porosity and stability for greater root development and water holding capacity

Always Safe for Plants, People, and the Environment

  • Manufactured by Suståne in the USA at an EPA permitted facility.
  • Pathogen and weed-free, no blood or bone products. Allowed for export to over 60 countries worldwide..
  • Aerobic composting eliminates animal and rodent attraction to the application site.
  • Contains naturally occurring beneficial bacteria and fungi that are necessary to begin the nutrient life cycle in poor soil.
  • Suståne is fully composted eliminating the need for sterilization, permitting a healthy environment for beneficial microbial populations.

Guaranteed Analysis

Total Nitrogen (N) 16%
0.2% Ammoniacal Nitrogen*
1.8% Nitrate Nitrogen*
2.6% Water Insoluble Nitrogen**
11.0% Urea Nitrogen*
0.4% Other Water Soluble Nitrogen
Available Phosphate (P2O5) 4%
Soluble Potash (K2O) 8%
Calcium (Ca) 2.75%
Magnesium (Mg) 0.75%
Sulfur (S) 1.00%
Iron (Fe) 0.25%
Manganese (Mn) 0.05%

Total Plant Nutrition

Organic Matter 45%
pH 6.8
Carbon: Nitrogen (C:N) 2:1
Bulk Density lb./cu. ft 42
% of Total N as Slow Release 90%

Derived from aerobically composted turkey litter, polymer coated urea, polymer coated potassium nitrate, polymer coated mono-ammonium phosphate, ureaform, hydrolyzed feather meal, and sulfate of potash.

 *12.7% controlled release nitrogen derived from polymer coated urea, polymer coated potassium nitrate and polymer coated mono-ammonium phosphate.

 **2.6% slow release nitrogen derived from aerobically composted turkey litter, ureaform and hydrolyzed feather meal.

Available Particle Sizes:

  • Medium Grade, 200 SGN (2.8 mm - 1.4 mm)


  • 50 lb. covers 8,000 ft2 @ 1 lb. N per 1,000 ft2 (44 lb. N per acre)
  • 22.67 kg covers 744 m2 @ 0.5 kg N per 100 m2 (50 kg N per hectare)


  • Apply 6.25 lb. per 1,000 ft2
  • Apply 32 g per 1 m2

Incorporating into Potting Soil Mixes and other Container Substrates:

Suståne 16-4-8 180-day provides a constant release of nutrients for approximately 180-days when used with container substrates with an average temperature of 70oF / 21oC. When determining application rates consider all cultural practices including irrigation, container substrate physical characteristics, and growing environment.

Container Mix Application Rates:

Container Mix Rates by Volume
lb. per cubic yardkg per cubic meter
5 9 12.5 3.0 5.3 7.4

Landscape Application Rates by Area
lb. per 1,000 square feetkg per 100 square meter
10 18 24 4.9 8.7 11.7

Bulk Density of Suståne 4-2-2:

Container Mix Rates by Volume
Rounded Measure (Volume)Grams (weight)
Teaspoon (tsp)Tablespoon (Tbs)1 oz1/4 cup1/2 cup1 cup
3.1 9.3 18.6 7.2 74.4 148.8

Container Topdressing Application Rates in Grams:

Rate5” Std.
(12 cm)
6" Std.
(15 cm)
1 gallon
(3.5 L)
2 gallon
(7.6 L)
3 gallon
(11.3 L)
5 gallon
(19 L)
7 gallon
(26.5 L)
10 gallon
(37.8 L)
15 gallon
(56.8 L)
Low 5 8 12 26 46 74 105 128 137
Med 7 12 19 40 69 111 158 191 205
High 10 17 26 55 57 155 221 268 287

Low Rate: Recommended for use on salt-sensitive species; when concurrent with liquid feed with production systems utilizing low leaching fractions (less than 10%) and when applied to heavy potting substrates (total porosity less than 65%).

Medium Rate: Recommended for use on salt-sensitive species; when concurrent with liquid feed with production systems utilizing low leaching fractions (less than 10%) and when applied to heavy potting substrates (total porosity less than 65%).

High Rate: Recommended for use on heavy feeding species; with production systems utilizing high leaching fractions (greater than 20%); and when applied to light, porous substrates (total porosity greater than 80%).

  • These rates are intended as guidelines. Suståne encourages a trial prior to changing any fertilizer program.
  • Do not steam sterilize container mix after fertilizer has been incorporated.
  • Do not store container mix more than two weeks after incorporating fertilizer. Plant material can be damaged from salt accumulation.
  • Monitor electrical conductivity (EC) of container substrate throughout the production cycle.
  • If the mix is stored longer than two weeks, leaching container mix may be required to remove accumulated salts.
  • Adjust application rate as needed.