yellowing leaves

[anthonyblunt]

This jock horror has been looking ill for a while, but cause of work commitments it's only now i'm getting to look at it properly.. any help greatly appreciated

What STRAIN are you growing? jock horror, nirvana
What was the establishing technique? (seed or clone?) seed
What is the age of your plants? 6 weeks
How Tall are the plants? 10 inches
What PHASE (seedling, vegetative or flower) are the plants in? veg
What Technique are you using? (SOG, SCROG etc) lst, soon to be scrog
What size pots are you using? (Include how many subjects to pot) 7 inch
What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?) biobizz allmix
What Nutrient's are you using?How much of each with how much water? How Often? *Knowing the brand is very helpful* biobizz biobloom
What is the TDS/EC/PPM of your nutrients used?
What is the pH of the "RUN-OFF"? 6.5
What method of pH test was administered? Using Strips? pH pen? ph pen
How often are you watering? when pot is light
When was your last feeding and how often are you feeding? every watering more or less
What size bulb are you using? 250w hps
What is the distance to the canopy? 8 inches
What is your RH Factor? (Relative Humidity)
What is the canopy temperature? 81-88
What is the Day/Night Temp? (Include fluctuation range) 75-88
What is the current Air Flow? (cfm etc.)
Is the fan blowing directly at plants? yes
Is the grow substrate constantly wet or moist? no
Is your water HARD or SOFT? ph is a good bit over 7
Has plant been recently pruned, cloned or pinched? no
Have any pest chemicals been used? If so what and when? none
Are plant's infected with pest's? no

 

[anthonyblunt]

> What Nutrient's are you using?How much of each with how much water? How Often? *Knowing the brand is very helpful* biobizz biobloom

Just notice a typo - i'm using biobizz biogrow

 

[MynameStitch]

Few things; when you put a plant in the soil; you want to fill it up to neat the top; but you want at least 1 in space from the rim of the pot so when you water it won't water over the pot.

The plants look like they are starting to lack potassium with some nitrogen issues happening on the lower part of the plant.....

how often are you feeding your plants and what dosage are you giving them with how much water?
Your pH is fine, so it just looks like it may be hungry. Where did you first start having this problem on the plant? Did it start at the top part and work it's way down?

 

[anthonyblunt]

I've had the problems for pretty much the whole of the last month but did nothing about it. I've been feeding about 1.5-2mls of biogrow per litre of water, and watering with plain water on average of once every three times.

Reckon I should up the dosage?

Thanks for the top re soil level

 

[MynameStitch]

Where at on the plant did the problem start from? The top part or somewhere else on the plant... the problem mimics the zinc deficiency; but I never seen it affect a whole plant, since this has been going on for a whole month I need to know if you remember where at on the plant it started from?

Ya, you most defiantly need to feed more often; once every 7 days is how often you need to feed; use around 1 tsp per gallon of water; so that would be 5 ml per 4 liters of water for you.

Are you using tap water? RO? Bottled? distilled?

 

[anthonyblunt]

New growth was fine, but pretty soon after a shoot developed the problem would start

I'm using tap water with a ph of 7.6ish, perhaps higher, and I bring it down to 6.5 with vinegar or dry ph down

Thanks for all this

 

[MynameStitch]

Vinegar is not a stable pH adjuster; it will work but it does not work for long and eventully the pH goes back to normal.......

That is why I am asking what your pH value is of your run off or if you have tested it.....

Your problem may be zinc as well as potassium...... this is why I was asking where the problem started.....