To start I’ve grown 4 plants successfully so still very new.
I had a gg4 that developed brown spots then yellow leaves which curled up and died. I chopped it. Now my strawberry cheesecake is doing the same. None of my other plants using the same nutrients and soil are doing this. The only thing those two had in common are they were flushed with sledhammer.
I have tried flushing again with just RO water then adding cal mag and tiger bloom but it continues you to get worse. It looks like calcium or phosphorous but nothing is fixing it.
Temp: 75/63
Humidity: 50
Lights: 2x California lightworks solar extreme 500s
Soil: happy frog
Water: well water before softening system. Ph to 6.5. Before nutes under 200ppm
Nutes: tiger bloom
Runoff ph/ppm: 6.7 and 900
Air: intake and exhaust, few fans
Careful with that chart with the ppms. It is a 700 scale chart so if your meter is a 500 scale and you put that amount of ppms in, you’ll burn the plant. I adjusted this to 500 scale. You will come in under the ppm on the chart if you’re not using the whole dirty dozen. At this stage you can use the amount recommended on the chart, just make sure to follow the flush schedule.
I was following it up until this problem started. Any recommendations on the next plan of action? Thanks for the updated chart also. Next watering should I flush and get back on schedule and see what happens?
Definitely. I’ve had problems keeping pH in check (due to salt buildup) and a flush very few weeks when later in the grow solves the problem. I usually start them a couple weeks into flowering.
A magnesium deficiency, as manganese deficincies are mostly characterized
by interveinal chlorosis which is a yellowing of the leaves between the
veins with the veins remaining green. The browning spots is called marginal
necrosis which is usually caused by a calcuim or magnesium deficiency.
A magnesium deficiency can be quickly resolved by watering with 1 tablespoon
Epsom salts/gallon of water. Until you can correct nutrient lockout, try foliar
feeding. That way the plants get all the nitrogen and Mg they need. The plants
can be foliar fed using ½ teaspoon/quart of Epsom salts (first powdered and
dissolved in some hot water). When mixing up soil, use 2 teaspoon dolomite lime
per gallon of soil.
If the starting water is above 200 ppm, that is pretty hard water, that will
lock out mg with all of the calcium in the water. Either add a 1/4 teaspoon per
gallon of epsom salts or lime (both will effectively reduce the lockout or invest
into a reverse osmosis water filter.
Mg can get locked-up by too much Ca, Cl or ammonium nitrogen. Don’t overdo Mg or
you’ll lock up other nutrients.
Calcium deficiencies are difficult to distinguish visually as excess calcium may
produce deficiencies in magnesium and potassium.
From the time you started seeing pistols / buttons up top would be the start of flowering.
Also epsom salt is readily available at grocery stores etc etc…commonly available and probably cheaper locally
Hell ya man! Thats awesome. I did a practice for EIB and did really well but off we went to Afghanistan then I got injured over there and never got the chance.
You say 200ppm is pretty high starting out. I am going to switch to using only RO. I was using RO and wasn’t adding cal mag every water so maybe that’s where it ran into an issue. Its a few days until watering so going to try the folier and see if it’ll survive. I know people trim a lot more leaves off then what I’ll have to if I can stop it from getting worse.
I have switched to living soil and all organic on my new plants. Planning to use only my well water not RO since its got minerals in it. Wondering if I’ll still need to add some cal mag.
