Yellowing Leaves

[Eskumalha]

Hy guys, im not sure if the yellowing and droping of my big fan leaves, is normal or not.

This started happening few days after flowering.
top of the plant seems ok, bud development also, but bigger leaves are just dying, and i can notice some discoulour on some of the bottom leaves as well.
i dont think its a N def, because i had them stuffed with N before entering, flowering, and ive feed them some bio grow, in the first week of flowering.

how long has this problem been going on? 1 week
What STRAIN are you growing? not sure, friend seeds.
What was the establishing technique? (seed or clone?) seed
What is the age of your plants? 1 month old approx
How Tall are the plants? 100 cm
What PHASE (seedling, vegetative or flower) are the plants in? flowering(2weeks)
What Technique are you using? (SOG, SCROG etc) neither
What size pots are you using? (Include how many subjects to pot) 7 and 14 liters pots
What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?) all mix from biobizz
What Nutrient's are you using?How much of each with how much water? How Often? *Knowing the brand is very helpful* Im using bio bloom and top max, 1 ml/L each, 2/3 of the watering.
What is the TDS/EC/PPM of your nutrients used? NPK 2-8-6
What is the pH of the "RUN-OFF"?6.5
What method of pH test was administered? Using Strips? pH pen?liquid ph tester
How often are you watering? when top of soil is dry, and pot feels light
When was your last feeding and how often are you feeding? yesterday, 2/3 of the watering
What size bulb are you using? 400 watts sont t agro hps
What is the distance to the canopy? around 30 cm
What is your RH Factor? (Relative Humidity) 60%
What is the canopy temperature? with fan on - 25 degrees C, fan off - 30 degrees C
What is the Day/Night Temp? (Include fluctuation range) drops to 20º
What is the current Air Flow? (cfm etc.) dont know
Is the fan blowing directly at plants? no
Is the grow substrate constantly wet or moist? moist
Is your water HARD or SOFT? around 100 ppm
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water? tap, controled with ph down from ghe, calcium and mag added
Has plant been recently pruned, cloned or pinched? no
Have any pest chemicals been used? If so what and when? no
Are plant's infected with pest's? no

i cant seem to put the pics here , they are on my gallery.

 

[Growdoc]

You need some more Nitrogen (N)...

GrowDoc

 

[Ploum]

Yes, a nice N deficiency for sure. During the stretch period, plants tend to eat a lot of N. Feed them next time you'll water with more bio grow. Also it's time to add some bio-bloom to your water if you get some.
Good luck.

 

[Core]

seems like a combined thing here....Bio Bizz is soiless and it need a lower ph lvl...this could interfear with ya N uptake....

 

[Eskumalha]

thanks guys.

i didnt tought it was N deficiency for 2 reasons, they didnt show, any signs during vegetative growth, and i feed them with bio grow in flowering period also.

also just before entering flowering ive repotted them, so the soil should have suficient N.

ive been giving some bio bloom, and top max, bio bloom has 1/4 of the N of bio grow, but still is some more N added.

Ill try to lower the soil Ph a little, maybe its a lock out, and if doesnt work ill add some more bio grow.