Faroutmancommentedweek 124 years ago
@TheUk420Show, I'm not really able to advise on whether it's worthwhile trying to get a precise EC for each plant, because I've not grown cannabis. To be really sure you would need to grow two identical plants side by side, feed one precisely, feed the other less so, then see if there is much difference in growth and yield. I suspect some strains might tolerate a wide EC range, while others are more fussy.
You should definitely keep the EC low for younger plants and increase as they age. Older plants tolerate, and need, a higher EC. My understanding is in veg cannabis generally likes an EC in the 1.0 to 1.5 range, and in flower 1.5 to 2.0.
What I would say is that I have found the Hydrocrop nutes to be VERY forgiving. By that I mean I've often grown plants with the feed EC way off the ideal range without any deficiencies or nutrient burn.
You're right that NPK are the major nutes, which plants use the most of, but plants grown without soil also need calcium and magnesium, plus micronutrients. All the micronutrients are in the B part of the HydroSol feed, so you need to be careful not to reduce part B too much. Personally, I would change your current 90ml of part B and 160ml of part A to more like 105ml B and 145ml A (switching round the other way in flower).
It sounds like you are making up the two stock solutions correctly (by separately dissolving the dry nutes at 100g per litre of warm water). But I'm still confused about how much stock solution you are using in your feed. It seems to me that you are NOT using a lot. If you are using 90ml B + 160ml A (= 250ml total) in 60 litres of water you should be getting at EC of approx 0.5. Are you using tap water which is adding to the EC, and is your EC meter calibrated?
It's good that you are measuring EC not PPM. As you probably know, PPM readings vary between meters because they do not all use the same scale. Your pH of 5.8 is ideal.
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