Suståne 5-2-4 is a natural organic slow-release nitrogen plant establishment fertilizer that provides a high amount of organic nitrogen for lasting plant nutrition.

Suståne 5-2-4 is a natural organic slow-release nitrogen fertilizer that provides a high amount of organic nitrogen for lasting plant nutrition.
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Suståne 5-2-4 is a natural organic slow-release nitrogen fertilizer that provides a high amount of organic nitrogen for lasting plant nutrition.


Suståne 5-2-4 All Natural Slow Release Nitrogen Fertilizer provides 6 - 12 weeks of nitrogen in the organic slow-release form and complies with the National Organic Program standards. Suståne replenishes the soil with a rich supply of humus (stabilized organic matter) and all of the essential naturally chelated nutrients required for sound and long term soil building programs. Suståne 5-2-4 All Natural is derived from biologically stable organic compost plus natural sulfate of potash and feather meal.

Recommended Use:

For use in the production of certified organic crops, greenhouses and bedding plants, and annual establishment.

Stabilized Organic Matter

Suståne 5-2-4 All Natural Slow Release Fertilizer was designed with the knowledge that the best way to grow quality plants is to develop and maintain healthy soil. While synthetic fertilizers supply plant growth nutrients, they do not supply the organic matter required to maintain quality plant life.

Benefits of Suståne 5-2-4

  • 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.

Incorporating into Potting Soil Mixes and other Container Substrates:

Sustane 5-2-4 provides a constant release of nutrients 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
Low Med High Low Med High
8.8 16 24 5.3 9.4 14.2

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 medium feeding species; on most nursery stock and foliage plants; and when liquid feed is not performed concurrently.

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%).

Bulk Density of Suståne 5-2-4:

Rounded Measure (Volume)Grams (weight)
Teaspoon (tsp) Tablespoon (Tbs) 1 oz 1/4 cup 1/2 cup 1 cup
2.8 8.5 17 34 68 136

Container Topdressing Application Rates in Grams:

Container Size
Rate5" Std.6" Std.1 gallon2 gallon3 gallon5 gallon7 gallon10 gallon15 gallon
Low 5 10 11 24 45 72 101 123 131
Med 11 21 30 55 107 173 384 298 320
High 16 29 45 94 166 264 380 456 490

Crop Application Rates for Suståne 5-2-4:

CropTimingApplicatin Methodcups/100ft2lb./1,000ft2lb./acre
Apples/fruit trees annual broadcast 1 lb. per 1" tree dia. 1 lb. per 1" tree dia. 1 lb. per 1" tree dia.
Brassicas* at transplant & 4 leaf stage broadcast 2.2 7.4 320
  2 wk. pre-crown set sidedress 4.1 13.8 600
Carrots at planting & 4wks pre-harvest sidedress 1.1 3.7 160
Curcubits (all vine crops) post plant in row 6.6 22 960
Garlic apply 3x per season sidedress 1.2 4.1 180
Grasses/Forages preplant broadcast 6 20.2 880
  post emerge broadcast 13.7 45.9 2,000
Legumes preplant broadcast 4.8 16.1 704
Lettuce-high density (12-18") at transplant & after 2 wks sidedress 12.4 41.3 1,800
Lettuce-low density (30") at transplant & after 2 wks sidedress 6.2 20.7 900
Onions at transplant & at 10" ht sidedress 1.5 5.1 224
Peppers at transplant & pre-blossom sidedress 1.9 6.4 280
Potatoes at seeding direct on row 9 30.3 1320
Raspberries, year 1 at transplant banded on row 4.4 14.7 640
Raspberries, year 2 spring application broadcast over row 1.7 5.5 240
Small Grains at seeding direct with seed 0.5 1.6 70
Strawberries, year 1 at transplant & pre-runner in row 2.8 9.2 400
Strawberries, year 2 at dormancy break broadcast over row 1.7 5.5 400
Sweet Corn, early starter sidedress 4.4 14.7 640
  at layby sidedress 2.2 7.4 320
Sweet Corn, mid-season at planting sidedress 4.4 14.7 640
Squash, hollow stem pre or post plant broadcast 5.5 18.4 800
Tomatoes at transplant sidedress 3-4" away 13.4 45.9 2,000

*Includes broccoli, cauliflower, cabbage, kale, Chinese cabbage, bok choy, and mustard greens.

  • 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 mix is stored longer than two weeks, leaching container mix may be required to remove accumulated salts.
  • Adjust application rate as needed.

Guaranteed Analysis

Total Nitrogen (N) 5%
0.5% Ammoniacal Nitrogen
0.5% Water Soluble Organic Nitrogen
4.0% Water Insoluble Organic Nitrogen*
Available Phosphate (P2O5) 2%
Soluble Potash (K2O) 4%
Calcium (Ca) 3.00%

Total Plant Nutrition

Iron 0.50%
Manganese 0.05%
Zinc 0.05%
Humic Acid 8.5%
Organic Matter 65%
pH 6.8
Carbon: Nitrogen (C: N) 4:1
Bulk Density lb./cu. ft 38
% of Total N as Slow Release 90%

Derived from aerobically composted turkey litter, feather meal, and sulfate of potash.
*4.0% slowly available nitrogen from aerobically composted turkey litter and feather meal

Available Particle Sizes:

  • Medium Grade, 200 SGN (2.8 mm - 1.4 mm)
  • Fine Grade, 100 SGN (1.4 mm - 0.6 mm)


  • 50 lb. covers 2500 ft2 @ 1 lb. N per 1000 ft2 (44 lb. N per acre)
  • 22.67 kg covers 100 m2 @ 0.5 kg N per 100 m2 (50 kg N per hectare)


  • Apply 20 lb. per 1000 ft2
  • Apply 100 g per 1 m2