Dr. Who
Well-Known Member
#1: I say only partly correct! Bloom nutrients have too low an N value and too high a P.....While more N can mask the too much P (for awhile) later the yellowing starting at the lower fans. Begins to move up the plant and out the branching.. This is limiting yields and decreasing potency.First thing you'll see if your N is too low is the older fan leaves yellowing. As you are starting your 5th week of flower it would not be a bad thing to be seeing that any time now as long as it doesn't rapidly spread within a few days to most of the larger fans. Pot naturally starts to pull it's nutes from the older leaves to support itself near the end. If the leaves are solid green to the end it's because they are getting fed a bit too much N or maybe lots too much. The other nutrients and minerals in tap water also contribute to this buildup. If it is lots too much the leaves often get thick and start to show chlorosis and then necrosis that doesn't look the same as regular nute burn but basically is the same. Just too much nutrient salts in the leaves and it desiccates them. They dry right up and crumble easily where with normal end-of-life yellowing the leaves don't thicken and stay soft and pliable until they start turning brown and falling off. I take them off when they are all yellow and have nothing left to offer the plant.
#2: FALSE! At the point of harvest. Your plant should still be covered with green leaves (you should have limited loss of the early and lowest stem leaves). You can have natural coloring being expressed but, that's very different then high P expressions! High N levels limit can bud production as far as size. reduce potency and bring out/promote foxtailing.....
#3: Um, with all due respect (I mean that!) Not exactly how that works biologically..... "Salts" are not delivered to the plant persay. Nutrients are delivered by being changed to ions and moved around the plant in ions of that nutrient..... "Salts" build up in soils or are too high a concentration in hydro applications....There are not "salt" buildups in plants.
pH is part of the over nutrient problem - they go hand in hand and each effects the other.
I hope I did not come off as arguing/being confrontational here.
Just trying to clear somethings up a bit.