Muriate of Potash (potassium chloride) - NPK 0-0-60

[Chunky Stool]

Oh, fish bone, didn't think of that. Probably just mercury in that. Didn't investigate it, just seems possible. My guess is that simple rock phosphate is probably better, though I know it also has some crud. See this is why I just use hydro nutes. Pretty much pure chemicals. Way cleaner than anything organic I know of for phosphorus. Basically, could just buy some food grade phosphoric acid and mix it with potassium hydroxide or carbonate, if you don't like commercial monopotassium phosphate. Bones are not better just because they're called bones instead of calcium phosphate. For that matter you could actually buy pure calcium phosphate. Of course I don't even use soil, because it's not a very good grow medium. Plenty of way better alternatives.

This post could not be more subjective.
I've grown in soil & soilless mediums and like them both, for different reasons.

 

[Dr. Who]

Jesus H Christ, not another heavy metal warning! Dammit. That's why I quit using feather meal...
I use fish bone.
What do you prefer? Guano? Soft rock phosphate?

I think some fault can be found in many things......I like a mix. Various release rates.

 

[Chunky Stool]

Fish Bone Meal 6-20-0. One year out from using Indonesian bat guano 0-7-0 for P. If anything, fbm is working better. The guano I used for about 6 years was claimed to be from ancient inactive caves. It is definitely fossilized. Another one I use is steamed porcine bone meal 6-8-0. Mixed in my soil, I do not run extreme amounts of phosphorus.

Fish bone meal will stink a little when first mixed so be prepared. After a week you don't even know it's there.

Have you tried crab meal? (4-3-0, 24% calcium)
It's stinky before mixing, but the smell fades quickly.
Lots of chitin...

 

[BobCajun]

Soil doesn't have optimal conditions for plant growth. Very easy to get optimal air and water content with soilless mixes and easier to deliver proper nutrition. There is no benefit whatsoever from organic soil. Something being closer to nature is not necessarily better. Soil is basically random filth and garbage. But to each his own. If you like a lot of extra effort for no real benefit so be it.

 

[Chunky Stool]

Soil doesn't have optimal conditions for plant growth. Very easy to get optimal air and water content with soilless mixes and easier to deliver proper nutrition. There is no benefit whatsoever from organic soil. Something being closer to nature is not necessarily better. Soil is basically random filth and garbage. But to each his own. If you like a lot of extra effort for no real benefit so be it.

LOL
You are funny.
How did our planet survive all these years?

PS: Human beings are made from the same organic "filth and garbage" you despise.

 

[Chunky Stool]

@BobCajun you will never hear a doctor say it's better to get your vitamins & minerals from pills rather than food.
Why is that? They are chemically identical, after all.

 

[Dr. Who]

LOL
You are funny.
How did our planet survive all these years?

PS: Human beings are made from the same organic "filth and garbage" you despise.

I don't think he despise's it. Just chooses not to use it....

I do have to say there is benefits to using it - properly!
Bet our organic soil grown has better terp profiles!
Some differing cannabiniod concentrations too (in the realm of the whole spectrum).....

 

[guitarzan]

I heard that muriate of potash has chlorine in it, therefore harmful to plants.

 

[xtsho]

I heard that muriate of potash has chlorine in it, therefore harmful to plants.

Actually chlorine is a micronutrient used by the plant. As with anything too much can be bad. Potassium chloride is the most widely used potassium fertilizer in the world.

Chlorine:
Classified as a micronutrient, Cl- is required by all plants in small quantities.

Chlorine is used by many in sterile hydro grows. I used household bleach for years with no ill effects to the plants. It's also not necessary to let tap water sit out for the chlorine to off gas. I've been using straight tap water chlorine and all for decades as have millions of other people to water their plants with.

Muriate of potash harmful to plants? Not unless you use too much which is the same with any nutrient.