m0useanswered grow question 3 years ago If your referencing this BioBizz schedule
https://www.biobizz.com/wp-content/uploads/2020/03/Nutrient-Schedule-EN-2020.pdf
I'm not seeing any 1.2.3 or 3.2.1
They recommend their feed on how many ml to add to a litre of water.
But all fertilizers must state the readily available N-P-K ratio.
EG, Biobizz Bio-Grow is 4-3-6. it stands for the percentage of available element in its mixed formula.
(N)Nitrogen, (P)Phosphorous and (K)Potassium, always in that order N-P-K
Hope this helps.
Happy Growing!