N-P-K ratio calculation

[Toby]

Hi all, 

 

I was wondering if any member has input on how to calculate N-P-K  ratios. Most fertiser companies provide a generic feeding chart for the various stages of growth. Various strains consumes differently and I am currently experiencing that.

 

I want to understand how to calculate the ratios to optimise the best possible feeding for my plants.

 

I have read that the ratios below are optimsed for the various stages of growth.

 

VEGETATIVE:

Seedlings 2-1-2

Early Vegetative 4-2-3

Mid-Vegetative 10-5-7

 

FLOWERING:

Cycle Changeover 7-7-7

Early Flowering 5-10-7

Mid-Flowering 6-15-10

Late Flowering 4-10-7

 

Using Nutriplex Trio as an example.

Micro 5-0-1

Grow 2-1-6

Bloom 0-5-4

 

How would I adjust Nutriplex to achieve the various ratios.

 

If someone could help out with the formula, it would be highly appreciated. 

 

Ill use the formula to setup an excel sheet to calculate.