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11Hick11 started grow question 3 years ago
During all stages of flower, what should the PH & PPM's be in runoff water for an indoor 10 gallon soil grow (High's & Low's)? Assume beginning #'s are PH=5.8 & PPM=100 from flush.
Sunset Sherbet
23 weeks
Sunset Sherbet 11Hick11
Sherbet
16 comments · 3 years ago
Resolved
Week 14
Techniques. Defoliation
Removed answered grow question 3 years ago
5.8 pH is a tiny wee bit low, but not much, it should be 6.0 as the lowest, highest should be 7.0; as for soil runoff, 100 PPM is practically nothing, that soil is devoid of any and all nutrients, the idea of using soil is that it gives the plant a buffer of nutrients, using (or buying soil) and then flushing it is counterproductive since you loose the very nutrients that you buy soil for.

The following information is from my 2nd run, using All-mix soil from Biobizz, it will give you some idea about runoff in soil. Prior to flowering, I transplanted to 3 gallon (11 liters) pots (from 2 liters or half a gallon), the first run off was 10.000 PPM, no feeding yet; at 2 weeks the runoff was 8.000 PPM, no feeding yet; at 4 weeks old they showed the first signs of PK deficiency and received a 500 PPM feed, the runoff was 5.500 PPM; at 5 weeks they received a 600 PPM feed with a runoff of 4000 PPM; at 6 weeks old they received a 700 PPM feed with a runoff of 3.700 PPM; at 7 weeks, the feed was 700 PPM again and the runoff was 3.500 PPM, at 8 weeks it was given water only and the runoff was 2.500; after 9 weeks they were harvested.
DasBoof answered grow question 3 years ago
Hi man, I''m also doing a soil grow 10 gal, and I've got not so good news. Basically I actually tried to get EC PH readings on soil, and it's tough. So can take some run off and run measurements on it, but i garantee you from one watering to the next you can have some very different readings, especially for EC. Basically the soil is sometimes more sometimes less in the run off which leads to inconsistent readings. Same with the PH of runoff but for the different reason that the soil is alive - PH and EC will vary depending on the soil's life's cycle, more sometimes and less sometimes because the soil is alive. Just letting you know something I found through experience - i found that interesting and it kinda opened my eyes to the complexity of soil. What's the point? measure PH and EC going in and out at various times to figure out when is the best time to measure and water .
Stick answered grow question 3 years ago
Hi @11Hick11! What a beautiful scrog you have there! As mentioned by others, your initial pH is a bit acidic for your medium. The runoff should show a slightly more acid pH, so a lower value. A 0.5-0.7 drop is not surprising and tells you that your soil is still in the correct pH range. The same rule applies for EC, you want a slightly lower value than what you've been giving in her meal, the lower the better, meaning plants eat a lot of nutrients. A higher value in EC would mean you're having a salt buildup in your soil, and a good flush is required. Hope this will help, keep us up-to-date and happy growing :facepunch:
OutForReal answered grow question 3 years ago
Hello ! In soil you should run a 6.5 PH at tha stage , it is the better range to absorb P K ( and other micro nuts ) and in flowering plants nedds pK ! The EC should be around 1.2/1.6 so the average ppm should be 700ppm ! But it's my opinion ! I hope it will help you :grin::+1: