S
sudshead
- 27
- 13
Oyster shell flour for calcium. as far as i can tell its almost pure calcium..
Nice, glad to help. Was also thinking maybe the ratio of composting material could be messing with ph a bit, when i fist starting using my own compost for indoor growing its ph was way too low and always had too much nitrogen in it (too much coffee grounds and leafy greens). Through some trial and error I learned i had to afjust and even fine tune ratios of what goes in my pile to get a good to go mixture coming out it. Dont know if this helps but figure id share this experience anyway.
I think you may want to add some peat for both lowering your pH and to raise your SOM %. I would add gypsum instead of lime or oyster. gypsum will work much quicker at raising your available calcium and it looks like you need sulfur anyhow. Oyster shell can take a year or more if your soil isn't very acidic.
I think you may want to add some peat for both lowering your pH and to raise your SOM %. I would add gypsum instead of lime or oyster. gypsum will work much quicker at raising your available calcium and it looks like you need sulfur anyhow. Oyster shell can take a year or more if your soil isn't very acidic.
I think you may want to add some peat for both lowering your pH and to raise your SOM %. I would add gypsum instead of lime or oyster. gypsum will work much quicker at raising your available calcium and it looks like you need sulfur anyhow. Oyster shell can take a year or more if your soil isn't very acidic.
This link seems to summarize in a clear manner my issues also
https://onpasture.com/2014/06/02/when-to-use-lime-gypsum-and-elemental-sulfur/
No but cutting your mix 25% with peat will drop your pH down into good range and supply you with SOM % (which IMO is probably lower than the tests shows.) Using gypsum will raise your calcium and sulfur.Gypsum is neutral in pH, and since it has no carbonate ion as part of its makeup, it will not neutralize acidity.
However, it is much more soluble than most lime products (about 200 times as soluble), so it does make a very good source for soluble calcium and sulfate. In other words, applying gypsum to the soil will raise the calcium and sulfur levels of the soil, but it will not raise the pH.
So at sulfur my level is 9 PPM - is that high, good or low?
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