Understanding the NPK Ratio of Fertilizers (With Examples)

[@DattyAlly]

as student lrealy understand, l can go infront of my fellow members and do like the way you teach me

[@DattyAlly]

l really like that😊

[@globalfungiat44]

Brilliant! Thank you!

[@thantunoosmall7763]

Thank for teaching npk very thank

[@darshdarsh5934]

Hello, I have a query, what I can understand you are not calculating N value in molecular weight as it is already in N form, but, what if I have a fertilizer which has nitrogen in Nitrate (NO3-) or Ammonia (NH3) form, do I need to convert the N value then by the same method you have shown in this video? e.x. for Ammonia to get correct N value do I need to deduct molecular weight of 4 Hydrogen atoms from NH3 to get correct number of N value in Ammonia?

[@StudyForceOnline]

No, it's not necessary to do that

[@happydays2190]

The thing that is super confusing to me is why do they call it an npk ratio when it's not a ratio but a percentage? Can you explain this to me. Some people further add to my confusion when they actually use it as a ratio, for example a product with npk value of 24,6,6 has an npk ratio of 4:1:1 Is it a ratio or percentage?

[@StudyForceOnline]

Technically, the ratio is missing a fourth term being the filler, but is not included because it is implied. Ratios when speaking generally are comparisons of qualities; thus, whether it is a ratio comparing percentages, that is allowed.

[@happydays2190]

@@StudyForceOnline so is it a ratio or a percentage?

[@happydays2190]

@@StudyForceOnline what do you mean by filler

[@StudyForceOnline]

@@happydays2190 100% represents the entire weight. If you subtract the terms of the ratio from 100%, you get a percentage that is not nutrients, which we call the filler.

[@StudyForceOnline]

A ratio comparing percentages, but what makes it special is that the filler part is not included as a term, hence not your conventional ratio

[@DattyAlly]

what are the methods of fertilizer application

[@StudyForceOnline]

An example would be spray applicators

[@kennycampbelljr5896]

What if the numbers are given in decimal format like 0.21-0.11-0.16 is that the same as 21-11-16?

[@StudyForceOnline]

Unlikely, as I have seen them written in decimal only to mean less than a percent. Are there any other details given?

[@MdAlamgir]

Conversion of K2O to K also seems wrong. If K2O is 7.5 lb, K should be 6.2257 lb not 1.8675 lb.

[@StudyForceOnline]

Correct, 50 lb * 0.1245 = 6.225 lb of elemental potassium (K). Thank you!

[@MdAlamgir]

In Q.1 the term fertilizer grade should be used instead of fertilizer ratio.

[@StudyForceOnline]

"fertilizer analysis" or "fertilizer ratio" is more popular where I live