Help - my soil is screwed up
Hi there- I’m doing my second outdoor grow and have what I suspect is an iron deficiency due to high soil ph
background - plants were transplanted into a soil mix that initially had. Ph of 6.5 via slurry test - plants grew vigorously for almost 1.5 months then they got the dreaded leaf septoria that I have been trying to keep in balance with potassium bicarbonate and neem oil. Last week they started developing new shoots that were yellow - I rechecked the soil ph and it had risen to 7.4 and I have been using 6.6 ph water hence I’m having issues with what I think is Iron. Any thoughts or suggestions other than lowering ph of input water (not possible of course when it rains).
Im pretty sure my soil issue is due to the use of chick manure additive I used in lieu of blood meal to ward of diggers
@binger 7.4 isnt really too high, she shouldnt be getting these kind of problems from that, have you introduced anything new to the feed recently?
Negative Mackey - I add 1.5 Tablespoons of Calmag per 4.5 gallons of water - I did stop that last watering because I did see some info on Calmag overdose that resembled the symptoms but became concerned when I saw that the ph had risen by .9 units - that was near the surface. The other thing I was thinking was stress from the septoria
I've seen this in other flowering plants when I either got heavy handed with amendments or more commonly for me when I didn't mix everything in well and the roots hit a hot spot. Did you amend the soil before you planted? What and how much, if any, did you apply and how long did you wait before planting? Some things like high calcium levels can lock out iron. Bone meal was my culprit.
If this is an iron deficiency an easy fix is to drop some bright un-galvanized nails in a bucket of water. They will rust quickly. You can water the plant with the rusty water to add iron if it's needed. I'd investigate before adding anything new. The plants look healthy except for the growth tips. I think it could be an excess but really welcome other opinions/diagnosis
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@monkeydo yes, I mixed soil up 3 times as it was fermenting for 4 weeks - one thing I know is that it was rather chilly the first week of fermenting. It’s the same soil mix I’ve been using successfully on all grows with the exception that I replaced the blood meal with granulated chicken manure. It’s a recipe I found on line - compost, promix, worm castings, blood/bone meal, alfalfa, kelp, lime, Epsom salts, and mineral dust. Also, I did mix it by hand - but it was a lotta soil (1.5 yards) so consistency could be the problem - two of the plants are not exhibiting the issue. Thanks
@kenevir27 although I don’t know what your stuff looks like - my brother in law had a similar issue - he was growing in fox farm stuff and was. Running low on Potassium - he started adding flowering nutes and it stopped progressing
@binger, Mobile nutrient problems will affect the bottom of the plant, immobile nutrient problems will affect the top of the plant. But if you have and "all over problem" then this is where this guide comes in. It doesn't say how to fix it but it helps tell you what the problem is. Good luck man.
PARTIALLY MOBILE SYMPTOMS-THROUGHOUT THE PLANT
Partially mobile elements are even easier because there are only two to worry about; Sulfur and Molybdenum. Sulfur excesses are almost never a problem in cannabis. I have seen ridiculously high amounts of sulfur with no issues but it can be too low sometimes. I always hedge on the heavy side as sulfur is needed for all of the volatiles that we want in a finished flower. If you are seeing uniform chlorosis across the entire plant then you have a sulfur deficiency. Remember it's where it starts not where it ends up that is important, That's why we want you to do daily scouting. Severely advanced sulfur deficiency will advance to necrosis on the tips but again it will be uniform throughout the plant, not just lower leaves or growing tips. A plant that is pale all over is most likely suffering from a sulfur deficiency.
Sulfur: Overall chlorosis
Mo deficiency is never seen in cannabis but it does show in poinsettias and some leafy greens as a pale chlorotic band around the margins of all leaves (again not at the top or bottom of the plant). Rather than going necrotic quickly as seen in a K deficiency it will stay light yellow to pale white along the margin. Again, we never see this in cannabis (yet).
Clarification on the two plants that are not exhibiting the problem, one of those plants was put in a hole I grew a plant in last year which turned out to be a male early on so I reused the soil it had been in.
@binger, I just got this and looked at it last night for the first time, maybe it'll help or it'll be old info for you. But google KIS Organics, then click on blog, then look for the Dichotomous table. That where I got that last post from. It's the same old info but it breaks it down better for soil. I'm in my first super soil grow from hydro so this stuff is greek to me but I'm trying to stay organic on this one. I have a K defish that I'm working on atm.
I think you may have some nutrient lockout given your pH. Yes, it should be fine at that pH, but your plants are outside and have had vigorous growth, so my theory is what would be marginally acceptable indoors is not good enough for vigorous growth outdoors. I think you are right to adjust your pH down and see if that enables better nutrient uptake. Sulfur can lower soil pH.
About your black spot that you mentioned: maybe you already know this but just in case you don't, fungicides are metabolized by the plants and any plants near the treated area, and SHOULD NOT be uses on plants to be consumed due to toxicity. I have never see a fungicide that differs from this, although they may exists. My point is that I would personally never use fungicide on anything but an ornamental plant, and never on cannabis that will be smoked. Hope that helps, bro. Bon chance!
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