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Guaranteed analysis?
I've got containers of magnesium sulphate, potassium sulphate and potassium
nitrate that I bought from Homegrown Hydroponics. The sides of the
containers contain minimum analysis numbers. What do these numbers
mean? For example: potassium nitrate (KNO3) contains a minimum of nitrogen
(N) of 12% and soluble potash (K2O) of 44%. The nitrogen I understand but
how did we get from K_O3 to K2O? Is K2O in this mix in addition to
KNO3? Similarly potassium sulphate (K2SO4) contains a minimum of soluble
potash (K2O) of 54%. Magnesium sulphate (MgSO4) contains a minimum of
magnesium of 10% and sulphur of 13%. I think these last two minimums are
the relationship between the atomic weights of magnesium and sulphur. But
why no reference to soluble potash as there was in potassium sulphate?