I had an interesting discovery today. I've noticed my recent batch of plants in flower has stalled out after 3.5 weeks (they are like 5.5 now). They still look amazing and are frosting up like no other, but flower production is not progressing like what it should be. So I got my trusty Bluelab soil pH pen out... and both my no-tills are sittin at 7.3-7.5 in multiple testing sites. this was about 2 hours after a watering, so that should be the ideal time to test the pH (I would think). I had some elemental sulfur prills laying around from the sulfur burner (says soil sulfur right on the package). I found an agricultural institution page and they recommended a dosage per sq. ft. so I worked that out to approximately the size of my no till and figured out its about 1 oz. of sulfur to increase acidity by .5 . I went with about 3/4 of the application rate I figured out. I'm going to give it til the end of the weekend and test again and see what the meter reads. I have a feeling that the slightly alkaline soil is the reason for my stunted flower production.
@DonTesla any ideas?
SO this has me wondering... I wonder if the worms have in some way neutralized the acidity of the peat from composting it... but then I think no they're not really divers so the lower portion of the peat should still be peat.
So that has me wondering if I just have too much Ca++ in the soil (which seems weird being that I don't topdress much calcium other than crab shell, very little oyster shell in these no-tills), and the soil is staying slightly alkaline. I was considering sending this soil in for a test after this run just to get an idea of what exactly is going on in there so I can adjust my methods.
I also have some topdressing experiments going on with the 3 con cheese in the 5 gal SIPs that are in flower. they're about 11 days, i topdressed some compost and ferts. in one, i used 5 TBSP of bloom mix (a stand alone bloom), 1 TBSP of frass, and 2 TBSP of rock dust. In another i used 2 TBSP bio-live, 2 TBSP crab shell, 4 TBSP kelp, 1 TBSP fishbone meal, 1 TBSP frass, 2 TBSP oyster shell and 2 TBSP rock dust. and in the last one, i kinda made a blend of everything and thus a slightly heavier dose. I figured I'd see what individual mix performed better between the two, and the third being kind of a comparison control and just seeing how hard i can push them. I will be checking the pH of these containers next weekend to make sure they are staying slightly acidic.