Anyone had any experience with brown patches spreading on leaves? This is happening on one of my autos.
It’s in a 1L pot (small pot because I just want to test out the strain, I have other strains in same tent in 11L pots) and in soil. ph is always between 6.2-7 when feeding.
It started last week as the plant started flowering on the lower older leaves which lead me to think it’s a phosphorus deficiency, as I had only fed veg nutes up to that point. I have done a few foliar sprays and feedings last week and just gave them a full strength feed now of bloom nutes to see. My thinking is as it’s in a small pot it’s used up all the soil nutes, but I’ve been feeding and it keeps spreading
Was thinking light burn but the top leaves are fine.
Cheers @209MIKE, hopefully the spreading slows down with the higher dose.
Was looking online at calcium deficiency too which looks similar, gave a bit of calmag to be sure. I had heard with regular tap water you don’t need calmag once pH is on point, any thoughts on that?
I have heard the same, but I guess it can still be used up before finished depending on the soil.
Don’t have to think about that, because I grow in coco and therefore have to feed calmag all the way.
I think you are right in your conclusion, but that is just an amateur growers guess
I know tap water does have higher concentrations of both calcium and magnesium but when I do use tap water I still add some calmag as a light dose just to be sure and if you see calcium or magnesium excess discontinue use and flush but I’ve never had excess myself. Now days I just use reverse osmosis bottled water to save myself the trouble. I started with 10 cases of 40 each and I’m running low already but I haven’t seen any deficiencies yet, 3 weeks old @Gunther
