hello fellow growers. im growing in soil (biobizz allmix) and im using advanced nutrients as my nutes. yesterday i decided to check the runoff on one of my plants. with surprize i noticed a huge PPM of 3500 with the ph beeing 6.5 . the plant is an autoflower in week 1 of flowering and im beeing very conservative on nutes giving 1ml / lt every other watering. im not always getting a runoff and not always checking it after every feeding. the plant looks very healthy. the moment i saw the high ppms i decided to water it immidiately with another 4 lt of plain ph ed water to check again . i got a bit lower ppms but still too high . what should i do ? the plant looks very healthy atm. thank you for your support
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im talking about the total but starting with RO or distilled in my case
When you say 500-600 PPM are you talking about the beginning PPM of your water or what the runoff is? The short time I used the bottle nutes my water was only about 500-600, but the runoff was really high, into the 2500-3000 PPM range. I was only feeding a small amount of nutes, just had high runoff PPM, I'm assuming that was from the dry amendments.
Ya, I was figuring I had went over board. So for now, prob best to just stay with reg PH'ed water to finish them out, and go way lighter next time.
so given the fact that autos dont need a lot of food and they easily get stressed out plus the fact that you started with hot soil and together with the dry amedments and plus the liquid feed you gave them is very easy to see that you overdid it with the nutrients . i will give you an example i have never surpassed 550-600 ppms when i grow in coco with enormous autos. so i think you need to tide up your feeding method with autos . maybe use supersoil with only some dry amedments , or use light soil with bottle nuts . less is more for autoflowers. for photos its a bit different i mainly grow autos . hope i helped you a bit
And thank you huge for any and all of the information.
Sorry if everything is jumbled around, super new, first time grower, just don't want to screw up.
So I'm growing indoor, autoflowers. They are in early flower now, but I also have some regular feminized non autos in there as well. I am growing in coco coir that I added dry amendments to and made a supersoil. The plants vegged great for the first 30 days, and I started added general hydro micro, gro, and bloom, not a lot, maybe half strength. I top dressed the plants with dry amendments and they started looking rough, a lot of different symptoms all at once. I think they were getting a nutrient lock out. I started doing only PH'ed water, no added nutrients. I started watching my runoff to try to see when the problem would get better. My starting PPM was around 3000-3500 in the run off when the plants looked bad. Each watering they lowered down around 200 or so. I am now around 1800-2000 ppm in the runoff. I have the PH at 6.2 and they have been grown from seeds in 5 gallon pots.
Since switching to water only the plants have looked better and better. I have two concerns. One is just making sure I give the plants enough nutrients. So how do I know when I need to either top dress or start adding liquid nutes again? And second is since the autos are in flower now is there anything I can do for bud production on the potassium and phosphorus or is it just best to let it ride out since they are too far in now?
What PPM and / or EC would you look for the numbers to drop down to before you started adding nutes again?
"if the next times i get the same high EC what do you think i should do ?"
keep watering until the runoff PPM lowers
"is it possible that such hot organic soils have always high runoff ppms? " yes many organic soils come with high runoff PPM to start. once the plant eats up all the nutrients, the ppm will lower and you will need to feed nutrients.
thank you for your answer . the plant looks very good with no curling at all but one click darker leaves specially the older big fan leaves. but the new leaves are looking normal color and very healthy. i will do as you say for the next waterings.
the all mix says it has food for the first 4 weeks so i fed the first time like a week ago at the start of week 5, just to be sure, with a minimum dosage around 0.5ml / lt . i guess it means it has more food inside? will not feed again till the runoff goes down.
if the next times i get the same high EC what do you trhink i should do ? is it possible that such hot organic soils have always high runoff ppms?
10 days ago i did the soil measurement manually by taking some soil in RO water for an hour after steering a lot and took measurments and everything was in order.
its the first time i try to grow in hot organic soil
How many times have you fed it advanced nutrients?
From Biobizz website: "Biobizz products only contain natural organic elements rather than mineral salts such as magnesium or sulfates that you might find in synthetic fertilizers. This gives All·Mix a high Electrical Conductivity (EC) value. And while its organic elements are impossible to measure, they do have a self-regulating system, which helps maintain the pH values at the correct level."
Organic nutrients need time to break down so that high PPM is most likely ok. Usually when growers aim for a certain PPM range, they are using synthetic bottled nutrients only. Got a pic of the plants? If the plants look fine then I would just back off the bottled nutrients for the next few waterings while measuring the runoff PPM each time. If you plants have excessively dark and shiny leaves then that's a sign of nitrogen toxicity which is due to over feeding. Leaf curling is another sign of nitrogen toxicity.