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What those Numbers Mean on your Fertilizer
Hibu Websites • October 14, 2020
We often get asked what we the numbers mean on fertilizer. That's the "grade". You see, all fertilizer
packaging is required to clearly display a label with the brand, grade,
guaranteed analysis, name and address of the manufacturer, and the
bag’s net weight.
The "Grade" is displayed as three bold
numbers separated by hyphens on a
fertilizer bag, which represent
product’s
percentages
of Nitrogen (N), Phosphorus (P) and Potassium (K) by weight. You've here gardeners and arborists refer to this as "NPK". As an example
Having the right mix of NPK for you turf, trees and shrubs is important to the overall health of your landscape. Here's what the each on of the elements do for plants.
First Number:
Nitrogen (N)
Second Number:
Phosphorus (P)
Phosphorus is also known as phosphate, but also called Phosphorus Pentoxide or P2
O
5
.
Third Number: Potassium (K)
Represents potassium, expressed as potash
Represents potassium, expressed as potash
(K
2
0). The example bag contains 5% potassium.
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