first legal organic outdoor grow

The weather is still pretty nasty at my area, I'll wait a little longer until I give them sunlight. I think they took the repotting well, only the northern light has some brown spots on one leaf. Last week I had some problems with my Selfmade soil. PH was at 8.5. I did'nt have any lemon juice and i thought citric acid would work as well. The solution had PH 5 and I used half a Litre for round about 30 L of soil. And well, the soil had PH 5. I did'nt get it and tested it again, 12 h later. Same result. I think the solution i made was buffered way to much. I used two tablespoons of chalk , PH is finally at 6.0.