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Hunteq

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Hunteq
@Hunteq, plants could grow in a soil even with an runoff ec of 4 or 5 (It happened to me with last grows with bokashi and bat guano as soil amendments), but for sure, it will give a lot of headaches (it definitely will raise your ph) and you will have to flush them a lot of times (put more stress on the plants). I just decided to low those soil amendments, and currently i will run a few growths without them. Regarding the bat guano with caustic potash, I found a master thesis (in spanish) that run some test with that combination in lettuce growths, and they find very nice results in the yields. They used citric acid to extract the mineral part of the bat guano, and use the caustic potash to extract the organic material from bat guano (I will use only the caustic potash). They used 100 grams of bat guano, 100 ml of potassium hydroxide (caustic potash), let them react for 24-48 hours (other researchers in other study let the caustic potash react with goat guano for 7 days), mix with 900 ml of water and then filtered to remove solids. This gave a very strong solution with a ph of 13, so you have to adjust the ph once you mix them with the water. For instance, I use 10 ml in 3 liters of water to obtain an ec of 1.2-1.4, but this dilution and final ec can vary depending on the bat guano composition (be sure your bat guano is phosphorus-rich one and not nitrogen-rich one). I have never used it in a full-flowering phase, yet I used it in the last 2 weeks of flowering of my meringue diary and buds fatten a little bit more, so for sure I will do the full test with this strain. Let me know if you need something else. Take care, mate.