Slow-Release Nitrogen Fertilizer with added Iron

Suståne® 5•2•4+Fe granular

Suståne 5-2-4+Fe is the original Suståne formula first created in 1988.  As this was the first Suståne product available on the market it soon became the standard natural based fertilizer evaluated by numerous universities.  Michigan State University, Cornell, University of Rhode Island were three of the first research facilities to discover that Suståne 5-2-4+Fe was highly suppressive of common diseases.  5-2-4+Fe is derived from biologically stable compost plus, ammonuim sulfate, methylene urea, natural potash, and ferrous sulfate. 

Professional Grade 

Suståne Natural Fertlizer 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's products is recognized by growers from around the world.

Benefits of 5•2•4+Fe
  • Adds approximately 5% humates by volume
  • Increases the nutrient and water holding capacity of the soil
  • Strengthens plants tolerance of hot, dry conditions
  • Improves buffering against changes in soil pH
  • Increases soil porosity and stability for greater root development and water holding capacity
  • Suitable for arid and saline soils, lowers transportation and application costs. 
  • Includes extra iron to enhance greening and improve establishment in degraded soils. 
  • Pathogen and weed free, no blood meal products. 
  • Aerobic composting eliminates animal and rodent attraction to application site.
  • Contains the naturally occurring beneficial bacteria and fungi that are necessary to begin nutrient life cycle in poor soil.
  • Manufactured by Suståne in the USA at an EPA permitted facility.
  • Allowed for export to over 60 countries world wide.
  • Balanced fertility and slowly available nutrients minimize weed growth. 

Professional landscapers have increasingly turned to Suståne 5-2-4+Fe for use on high maintenance turf and landscaped environments. While synthetic fertilizers supply plant growth nutrients, they do not supply the organic matter required to maintain quality growth. Using fully composted natural fertilizers increases the levels of beneficial microbial activity, which in turn convert nutrients into plant available forms.


For Revegetation

Final fertilizer recommendations should be based on laboratory soil tests. 

Soil Preparation

Light, High Sandy Soil: 5 lb. per 100 ft2 of bed
Medium, Clay Loam Soil 3.5 lb. per 100 ft2 of bed
Heavy, Silty, Clay Loam 2 lb. per 100 ft2 of bed


50 lb. covers 2500 ft2 @ 1 lb. N per 1000 ft2 (44 lb. N per acre)
22.67 kg covers 232 m2 @ 0.5 kg N per 100 m2 (50 kg N per hectare)
20 lb. per 1000 ft2 = 100 g per 1 m2

Landscape Maintenance

Spring, summer and fall: Apply 20 lb. per 1000 ft2 (9.8kg per 100 m2) every 8 weeks or as required to maintain plant health.

*NOTE: Adjust fertilizer program for local conditions and requirements.



Item # 
Suståne 5-2-4+Fe
Package Size Units / Pallets
(1.4 .mm - 0.6 mm) 
40-35-1375 (international)
50 lb. bags
1-ton tote 
22.68 kg bags 
40 bags / pallet
1 tote / pallet
44 bags / ISPM pallet 
(2.8 mm - 1.4 mm) 
40-35-1175 (international) 
50 lb. bags
1-ton tote 
22.68 kg bags 
40 bags / pallet
1 tote / pallet
44 bags / ISPM pallet


Total Nitrogen (N)

1.1% Ammoniacal Nitrogen
3.5% Water Insoluble Organic Nitrogen*
0.1% Urea Nitrogen
0.3% Other Water Soluble Organic Nitrogen
Available Phosphate (P(2O5) 2%
Soluble Potash (K2O) 4%
Calcium (Ca) 3%
Iron (Fe) 2%
Sulfur (S) 2%

Derived from aerobically composted turkey litter, methylene urea, sulfate of potash, ammonium sulfate, and iron sulfate.
*3.5% slowly available nitrogen from aerobically composted turkey litter and feather meal.