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Help - my soil is screwed up

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Binger
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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).

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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

 
Posted : July 14, 2022 2:11 pm
Fish, Hart, Doctor X and 21 people reacted
Macky
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@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? 

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Posted : July 14, 2022 4:05 pm
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Binger
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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

 
Posted : July 14, 2022 5:00 pm
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monkeydo
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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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Posted : July 14, 2022 8:23 pm
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Binger
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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

 
Posted : July 14, 2022 8:53 pm
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(@kenevir27)
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@binger

Buds are starting to form, flowers are drying, what could be the reason?

 
Posted : July 14, 2022 8:59 pm
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Binger
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@kenevir27 what is soil fertilizer - the chicken shit?

 
Posted : July 14, 2022 9:21 pm
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Binger
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@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

 
Posted : July 14, 2022 9:26 pm
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WoodI2
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@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).

 
Posted : July 14, 2022 10:02 pm
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Binger
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@woodi2 yup im fairly certain it’s an immobile nutrient issue - only new  shoots started exhibiting the issue - I’ll see how they respond to straight water phed down to 6.3

 
Posted : July 14, 2022 10:18 pm
Hart, Doctor X, im_sparky and 18 people reacted
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