21-4-8, 8-9 M

Economical choice for general purpose outdoor production

21

N

4

P2O5

8

K2O
Find a dealer

The Poly-S technology in Osmocote Blend 19-5-9 ensures that nutrients are delivered at a constant rate regardless of climate or temperature swings.

  • Consistent release and accurate longevity across multiple temperature ranges

  • Highly efficient nutrient delivery promotes robust growth and maximum economy

  • Dual coatings reduce nitrogen leeching and decompose with minimal environmental impact

  • Fortified with STEP Hi-Mag micronutrients

  • Can be incorporated into growing media or surface-applied in the container

Longevity at average media temperature

60 ̊F (15 ̊C)70 ̊F (21 ̊C)80 ̊F (26 ̊C)90 ̊F (32 ̊C)
9-10 months8-9 months6-7 months5-6 months

 

 

Surface application (grams)

Common container
volumes		Approx. containers
per cubic yard1		LowMedHigh
1 quart850357
2 quart40071115
1 gallon trade30091420
1 gallon210132128
2 gallon trade125223547
2 gallon102274258
3 gallon70396284
5 gallon525283114
7 gallon3578123169
1May vary depending on container brand, media, and fill method.

 

 

Large container volumesSurface area
in square feet		LowMedHigh
10 gallon (17" diam.)1.494149204
15 gallon (17.5" diam.)1.5101160219
20 gallon (21" diam.)2.3155245335
25 gallon (22.5" diam.)2.8188298408
30 gallon (26.5" diam.)3.8256405554
45 gallon (30" diam.)4.8323511699
65 gallon (30" diam.)4.8323511699
100 gallon (36" diam.)7.14787561035
200 gallon (48.5" diam.)12.886113631865
24" box4.0269426583
30" box6.25420666911
36" box9.06059581312
48" box16.0107617042332
For containers not listed, multiply surface area by:67106146

 

 

Incorporation

LowMedHigh
Pounds per cubic yard6.09.513.0
Kilograms per cubic meter3.65.67.7
Grams per liter3.65.67.7

 

 

Landscape

LowMedHigh
Pounds per 1000 square feet9.516.524.0
Kilograms per 100 square meters4.68.111.7
Pounds of N per 1000 square feet2.03.55.0

 

 

Approximate Volume Measurements

 

ICL spoons

#1#2#3#4#5#6#7
Grams9131634456689

 

 

Conventional measures

1 tsp.1 tbsp.1/4 c.1/3 c.1/2 c.1 c.
Grams5146283125249

1
Verify product analysis, longevity, and rate for plants in your production system (for assistance, contact your regional ICL Territory Manager or call ICL Customer Service at 800-492-8255)
2
Consult rate tables printed on bag labels and product sheets
3
For incorporation, blend into growing media to ensure uniform distribution of fertilize
4
Do not over-mix (doing so could damage fertilizer coating)
5
Growing media should be used within two to four weeks after incorporating fertilizer
6
For top-dress applications, spread fertilizer evenly on container surface (avoid piling fertilizer directly against plant stem)
7
Irrigate after application (irrigation frequency and volume should be adjusted during the crop production cycle according to crop type, environmental conditions, and desired soluble salt levels)
8
A product trial is recommended before adopting a new fertilizer program or making full-scale changes to standard cultural practices (test several rates on representative plant types)
9
Use caution when applying to plants being over-wintered under cover (if you can't monitor soluble salts and/or adjust irrigation practices, avoid Fall and Winter applications
10
Store in a clean, cool, dry place

Brand details

This product is part of the Osmocote Blend, Poly-S portfolio

Poly-S release technology delivers nutrition at a constant rate regardless of climate variations.

Learn more about Osmocote Blend, Poly-S
thumb

Our products

Products for greenhouse and nursery ornamental plants

Explore our products
thumb

Our brands

Setting the standard in the ornamental market for 50+ years

Explore our brands
thumb

Our knowledge

Tips and advice, the latest technologies, market related information

Explore our knowledge