Identify this deficiency?!

Bubblegum at 3 weeks blooming. Soil, CocoGro, and Perlite mix, water pH of 6.4, 1000W HPS, Flora Nova Bloom(4-8-7). I have four plants...sour diesel, lemon kush, grapefruit, and bubblegum...and this discoloration only happened on a few random, larger fan leafs in the middle of the Bubblegum plant. The rest of the plant, and all the other plants, is perfect. I water every three or four days...whenever needed. Any ideas?

I'd say n? if sure someone will tell me what they think with it looking like that? is the red on the stems on all the leafs that are ok and has it been there always from the start if you know where im coming from lol

the nutrient your using is for flowering (hence the term 'bloom' and the low N (N-P-K... your at 4-8-7). id get something with a lil less potassium and phosphorus and more nitrogen. the one i use is 5-1-2. Ive heard a bloom nutes are good during veggie state, but very little and not often, like 4 parts veggie nutes, to 1 part bloom nutes. good luck.

I have a thread just for helping people solve nutrient deficiencies..check it out see if it helps you at all ....https://www.rollitup.org/advanced-marijuana-cultivation/463698-thread-cannabis-nutrient-deficiencies.html

I did think it looked like nitrogen, as well. It's not a major problem, and I wouldn't even care if it was occurring closer to harvest time...but I have 6 weeks left! Thanks for all the input.

It's almost definately N. I use MG tomato during flower, it's 8-12-12 and .5 Mg. I use about half strength that and half strength bloom nutes.

cranker said:

It's almost definately N. I use MG tomato during flower, it's 8-12-12 and .5 Mg. I use about half strength that and half strength bloom nutes.

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Those sound like good numbers to me...thanks for sharing!