Bigyin wrote on Jan 16^th, 2011 at 12:08am:

Don't know the actual barand (Oliva) and may be teaching you to suck eggs here but the numbers indicate, in order, the percentage of nitrogen (N), phosphorus (P), potassium or potash (K), and sulfur (S) - the letters in parentheses are the chemical symbols for the elements. It may have been recommended for your olives but should be fine for general fertilising.  Will probably do more good than harm depending on the plants you're planning to use it on.  Might pay to do  bit of research on Google. I hope this doesn't sound rude but if you've been here several years and are keen on gardening, how come you're still struggling with weeds and sourcing supplies ?

I do not think the S [Sulphur] is ever mentioned in Fertiliser  Nutrient Ratios, it is always just N:P:K Nitrogen, Phosphorus, Potassium, the 3 most important elements by quantity a plant needs.

Generally higher N ratios are for growth periods, e.g. 5:2:2 and higher P/K ratios are used for flowering and fruiting, e.g. 2:5:5. Using "the wrong one" can cause growth problems with some crops, so it is good to ask the locals for advice.

Soldebre have been very helpful with advice and stock, also found the TREF Potting Soil from there is good, it is made by Jiffy.