ok thanks just doing organic this run and was trying to keep it simple but i keep finding stuff on markdown lol and have heard of people using gypsum
Good source of Cal/sulfur, that doesn'treally affect PH. As you water, a good amount is soluble. I use it in my soil mix and add as topdress before the flip/flower.
I know growers that successfully use it to combat the effects of high alkalinity water sources pushing soil pH too high. I think of it as a band aid approach. Believe it or not but salts are found in organic gardening as well. Calcium carbonate is a salt. If you would like to go down the rabbit hole on any of the questions I have seen you ask or others, try this. When you google something follow it with .edu or .ext, this will pop up white papers from universities or county extension offices. Legit information every time. That said, enrolling in your local Master Gardener program is incredibly helpful and fun too. RD
I thought gypsum was used more for a soil "conditioner" than nutrient value??? If it aint broke... ? I just did a quicky soil rejuv of the soil/pots I harvested last, NO peat moss or ewc's, or composts THIS ROUND! Added: alfalfa meal, bat guano, fish meal, kelp meal, rice hulls, vermiculite, perlite, ground neem & let it sit until needed app 2 months. I've been re-using my soil for 3+ yr's now, & combined there are a shit ton of nutes in that soil that the plants could not possibly have used up. Going forward??? less to NO liquid nutes.
I think 90% of what I read about gypsum calls it a soil conditioner useful for breaking up high clay soils. Otherwise it’s a tricky little critter in that it is made from sulphur that lowers pH and calcium that can raise pH. So essentially the pH has to swing one way or another to release its constituents. I still add some to mixes to add sulphur, but I don’t think it’s very effective for that. I suspect when I finally use up my jug of gypsum I will probably discontinue using it. I used to think it was another good source of calcium, but again there are better/easier ways to get the calcium we need for our plants. Like I said before, I still use it, but it’s hard for me to really justify using it. I ran it in my early mixes when I was still learning and since they worked awesome, I can’t bring myself to quit using it ( till I run out). Cheers Os