4-6-4 Organic Fertilizer Delivers a Balance Of Nutrients, Humates, Compost-derived Microbiology and Slow Release Nitrogen In An Easy-to-spread Homogenous Granule

Recommended Use 

Suståne 4-6-4 is an organic slow-release starter fertilizer and soil builder for all types of plants. Ideal in-furrow starter applications on agronomic crops, and general feeding of specialty crops such as vegetables, roots, herbs, fruits, and flowers. Allowed for use in the production of certified organic crops. Trusted by nurserymen, master gardeners, farmers, and professional growers worldwide. 

Suståne 4-6-4 is an all-natural, compost-based organic starter and maintenance fertilizer. It replenishes the soil with a rich supply of humus and all plant essential nutrients. Suståne 4-6-4 provides a balanced mix of slow-release nitrogen and other nutrients derived from biologically stable compost, natural potash, and feathermeal. 

Professional Grade 

Suståne Natural Fertilizer is backed by over 30 years of independent applied research on diverse crops and ecosystems. Unmatched by any other organic fertilizer manufacturer, such research is the foundation for developing products that deliver value under a wide variety of growing conditions. The superior performance of Suståne products is recognized by growers from around the world.

Benefits of Organic 4•6•4

  • Adds 50% organic matter by weight which increases CEC and builds soil health over time.
  • Increases plants tolerance to hot dry conditions.
  • Provides approximately 5% humic acid by weight
  • Pathogen and weed-seed-free
  • No wait times for time of application to time of harvest for edible crops
  • Promotes healthy root development
  • Improves buffering against changes in soil pH
  • Increases the soil’s ability to suppress plant pathogens
  • Increases soil aggregate stability, porosity, and quality for greater root development and water-holding capacity
  • post-based microorganisms to help replenish life in poor soils

Safe for Plants, People and the Environment 

  • Fully tested and compliant with the national organic standards and the Food Safety Modernization Act 
  • Manufactured by Suståne in the USA at an EPA permitted facility 
  • Builds organic phosphorous within the soil 
  • Contains no pharmaceutical waste 
  • Allowed for export to over 60 countries world wide. 

General Crop Application Rates**
Crop Timing Application Method cups/100ft2 lb./1,000ft2 lb./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 2.8 9.2 400
  2 wk. pre-crown set sidedress 5.2 17.2 750
Carrots at planting & 4wks pre-harvest sidedress 1.4 4.6 200
Curcubits (all vine crops) post plant in row 8.2 22.6 1,200
Garlic apply 3x per season sidedress 1.5 5.2 225
Grasses/Forages preplant broadcast 7.6 25.3 1,100
  post emerge broadcast 17.2 57.4 2,500
Legumes preplant broadcast 6 20.2 880
Lettuce-high density (12-18") at transplant & after 2 wks sidedress 15.5 51.7 2,250
Lettuce-low density (30") at transplant & after 2 wks sidedress 7.8 25.8 1,125
Onions at transplant & at 10" ht sidedress 1.9 6.4 280
Peppers at transplant & pre-blossom sidedress 2.4 8 350
Potatoes at seeding direct on row 11.3 37.9 1,650
Raspberries, year 1 at transplant banded on row 5.5 18.4 800
Raspberries, year 2 spring application broadcast over row 2 6.9 300
Small Grains at seeding direct with seed 0.6 2.0 88
Strawberries, year 1 at transplant & pre-runner in row 3.4 11.5 500
Strawberries, year 2 at dormancy break broadcast over row 2.9 6.9 300
Sweet Corn, early starter sidedress 5.5 18.4 800
  at layby sidedress 2.8 9.2 400
Sweet Corn, mid-season at planting sidedress 5.5 18.4 800
Squash, hollow stem pre or post plant broadcast 6.9 23.0 1,000
Tomatoes at transplant sidedress 3-4" away 17.2 57.4 2,500

* Includes broccoli, cauliflower, cabbage, kale, chinese cabbage, bok choy, and mustard greens.
**These are general application rates that are to be used in the absence of a recent soil test.

Soil Preparation
  • Light, High Sandy Soil: 20 lb. per 100 ft2 of bed
  • Medium, Clay Loam Soil: 15 lb. per 100 ft2 of bed
  • Heavy, Silty, Clay Loam: 10 lb. per 100 ft2 of bed

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%).


Store in a cool, dry place. Do not expose to moisture or extreme temperatures. 

Item #
Suståne 4-6-4
Package Size Units / Pallets
(1.4 .mm - 0.6 mm)
50 lb. bags
1-ton tote 
22.7 kg bags 
40 bags / pallet
1 tote / pallet
44 bags / ISPM pallet 
(2.8 mm - 1.4 mm) 
30-20-1175 (international) 
50 lb. bags
1-ton tote 
22.7 kg bags 
40 bags / pallet
1 tote / pallet
44 bags / ISPM pallet
Bulk Density

4 6 4 Agriculture Bulk Density


Total Nitrogen (N)
  0.4% Ammoniacal Nitrogen
  0.4% Other Water Soluble Nitrogen
  3.2% Water Insoluble Nitrogen*
Available Phosphate (P(2O5) 6%
Soluble Potash (K2O) 4%
Calcium (Ca) 4%
Magnesium (Mg) 0.75%
Sulfur (S) 1%
Iron (Fe) 0.25%
Derived from aerobically composted turkey litter, feather meal, bone meal, and sulfate of potash. *3.2% slowly available nitrogen from aerobically composted turkey litter and feather meal.