Browning tips 40 days into flower

Hey all
slight problem here. My leafs are browning at the tips. Sugar leaves at the very tips are yellowing just a little with a aspects of brown at the tip.

This is Pineapple Chunk, day 43 flower. Water - feed - water - feed rotation. Half strength GH Flora nutes. 12/12 cycle under 400w HPS. Max temp=86f. HPS is 16 inches from the tops. Grown in 100% HP Promix. Water PHed at 6.5 after nutes added. Water every 5 days or so, only when real dry. Ventalation is excellent.

Any thoughts appreciated. Have a spice day!

Anyone?

Tips of leaves are yellow, brown, or dead. If Plant otherwise looks healthy & green. Stems may be soft >> Over-fertilization (especially N), over-watering, or insufficient soil aeration (use more perlite ). I would also try to rope in those temps. Flowering needs a REDUCED amount of nitrogen . Make sure you are in bloom nutes. Has plants been flushed prior to nute changes ?

I forgot to ask ... Are these short AUTOS or photo seeds ?

Budzbuddha said:

Tips of leaves are yellow, brown, or dead. If Plant otherwise looks healthy & green. Stems may be soft >> Over-fertilization (especially N), over-watering, or insufficient soil aeration (use more perlite ). I would also try to rope in those temps. Flowering needs a REDUCED amount of nitrogen . Make sure you are in bloom nutes. Has plants been flushed prior to nute changes ?

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Thanks for the chime.
Flushed last watering which was about a week ago. That was my 1st flush also. Ya, Temps need a little adjustment.
All in all, they seem to be doing fairly well. Just wondering what the hell the brownage was. Thanks again.

Budzbuddha said:

I forgot to ask ... Are these short AUTOS or photo seeds ?

Click to expand...

Feminized

Overall they look like they are swelling up nice. What is the harvest time for this strain ?

Next go, I'll add 20% perlite to the mix.

Budzbuddha said:

Overall they look like they are swelling up nice. What is the harvest time for this strain ?

Click to expand...

60 to 70 days. Read it can take much longer than that.

Looks good , yes those harvest times are just guides. My CHOCO strains are listed around 65 days but I push til day 73 before chop.

Looks like your using the correct amount of nutes. As that does look like nutrient burn but likely not caused from over feeding. The burn is either from ph or more than likely with the assistance of humidity over 65 and stagnant air this can cause the tips to easily burn.