eds said:I'm sure I remember on APC someone talking about getting ferts with a percentage purity quoted on them as their ferts were agricutural in origin and not as pure. If you have got that then all you have to do is work out the percentage and up the amount used appropriately. E.g. if they were 80% pure you'd need to add an extra 20% to get the same level.
Most ferts are way more pure than this and to be honest, like Andy said, they are usually just one or two percent and this doesn't really matter for our purposes.
SuperColey1 said:I will ask but you'll be putting Richard out of business. lol
If they let me and sell me at the prices I buy at it would be (per kilogram)
Potassium Nitrate - 28p / kg
Potassium Phosphate - 48p / kg
Potassium sulphate - 18p / kg
All plus VAT of course
I also buy chelated iron, copper, magnesium, zinc,
Epsom Salts, Sodium Molybdate (£20k / ton....phew)
Loads more but can't think. lol
andy