Quote:
Originally Posted by LilRaverBoi
Okay...here's my question. Are the three numbers percentages??? Cause they rarely add to 100. I always assumed they were how may parts....a ratio, if you will. Like 10 parts N to 10 parts P to 10 parts K.
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It is percent by weight.
If it ever added to 100 that would be some strong mojo!
Part may be filler (purposefully), but it also can be any variety of parts that don't get counted in those 3 numbers. Minors & micros. If they used ammonium sulfate for the nitrogen source, you'd have that sulfur in there. If they used potassium chloride as the potassium source, you'd have that chlorine in there. (On the back of the bag you may see, for example "chlorine not more than 10%.") Potassium nitrate has N & K both, but also oxygen (O3) in there. In the case of "slow release" types there will be whatever resin stuff they use that slowly dissolves to release the goodies.