is this just a normal nitrogen deficiency during mid flowering or......

[simonh]

Hey everyone

I'm growing an autoflower strain called Himalaya Blue Diesel.

The plant in question is now 5 and a bit weeks old and the expected cycle is 8-10 weeks.

I noticed today the the mid to lower leaves have changed colour overnight and are now a lighter shade of green. The new leaves and upper leaves are fine.

Is this just an expected Nitrogen deficiency, to be expected at this time and therefore required no action, or is it something I need to fix.

Its a totally organic grow and been limited (in Uruguay) with possible solutions if I need to fix it, all I have with Nitrogen in in some 'weak' sea bird guano with a value of 5-4-2

SOIL:

How long has this problem been going on? one day
What STRAIN are you growing? Himalaya Blue Diesel
What was the establishing technique? (seed or clone?) from Seed
What is the age of your plants? 5 weeks
How long have they been in the soil mixture they are in now? 2 weeks
How Tall are the plants? 20 cm
What PHASE (seedling, vegetative or flower) are the plants in? flower
What Technique are you using? (SOG, SCROG etc) none
What size pots are you using? (Include how many subjects to pot) one plant per 6.5 litre pot
What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?) 40% Peat Moss / 20% Coco / 20% Perlite / 20% Worm Castings / 30g Bone Meal/30g Dolomite Lime
What Nutrient's are you using? Guano Teas with Bat Guano (hi prosperous) 12g, Worm Castings 20g, Sea Bird Guano 20g, Black Strap Mollasses one teaspoon
How often are you feeding? teas once a week diluted 50/50 with distilled water
If flowering, when did you switch over to using Bloom nutrients? switched to flowering tea 2 weeks ago
What is the TDS/EC/PPM of your nutrients used? dont know
What is the pH of the "RUN-OFF"? dont know
What method of pH test was administered? Using Strips? pH pen? probe into soil
How often are you watering? approx 2 a week - once with diluted tea, once just water (dilstilled)
When was your last feeding and how often are you feeding? 2 days ago
What size bulb are you using? 400w HPS
What is the distance to the canopy?
What is your RH Factor? (Relative Humidity) 55-60%
What is the canopy temperature? 80 degrees
What is the Day/Night Temp? (Include fluctuation range) 80 day / 70 night
What is the current Air Flow? (cfm etc.) three fans (BC Northen Lights Bloom Box
Tell us about your ventilation, intake exhaust and when its running and not running ? running all the time on a 20/4 schedule (lights)
Is the fan blowing directly at plants? no above
Is the grow substrate constantly wet or moist? moist
Is your water HARD or SOFT? Dilstilled
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water?
Are you using water from a water softener?
Has plant been recently pruned, cloned or pinched? no
Have any pest chemicals been used? If so what and when?B]no[/B]
Are plant's infected with pest's?B]no[/B]

 

[bombadil.360]

um... by your descriptions, it seems you are feeding them enough... is there water always lodged at the bottom of the buckets by any chance (wet feet) ?

because 20cm tall plants already in flower in a 6.5 liter pot has too big of a pot...

have you tried letting the soil dry until your pot feels light?

good luck

 

[Scrogerman]

Doesent look normal to me, its too early in bloom to be yellowing, looks like an N def which will lose you yield if it is not treated. Maybe you might get away with a foliar, if not try painting a treatment on to over & the under side of the leaves for a mega quick fix! I would flush your pots & feed as normal, making sure you have a decent source of N in your ferts. What ferts are you using man? I do see alot of AF's doing the same thing about the same time as yours, so maybe, na it aint right it cant be, its too early looking at them.!

 

[simonh]

Thanks for the replies. No they never get wet feet. Most people recommend that size pot for AF Dwarf's.

I'm preparing (for tomorrow) a 'nitrogen' tea - 2 L Chlorine free water, 25g SBG, 25G Chicken G. This will hopefully get N to it quickly, but having read your post, I can't decide whether to foliar feed, paint or just water with the Tea - can I paint or spray with a guano tea without damage ??

 

[Scrogerman]

Possibly yes, in the stage of bloom you are in, try it on 1 as a control first, & use a weakened/diluted dose to be on the safe side! I dont really condone foliar applications whilst in bloom, but you may get away with it in the stage your in! why i recommend you paint it on your leaves (underside & overside), this way you lessen the chance of infecting your buds through dampining them which could cause moldy buds if you aint carefull!