yellow spot

[slimj]

How long has this problem been going on? 2 days
What STRAIN are you growing? sensi star
What was the establishing technique? (Were the seed or clone?) Seed
What is the age of your plants? 9days
How long have they been in there mixture they are in now?(coco,soiless etc..) Germinated in jiffy pots and putt in 100% canna coco
How tall are the plants? 4cm
What PHASE are the plants in? (seedling, vegetative or flower) are the plants in? Seedling/Veg
What Technique are you using? Hand water
What substrate/medium are you using?(Hydroton, RockWool etc.)canna Coco
What Nutrient's are you using?(If growing soiless) canna coco a+b
How much of each nutrient are you using with how much water? 5ml a+5ml b on 10liter
How often are you feeding? (If using soiless) With every watering (It's been about every 1-2 days)
What order are you mixing your nutrients? (example: veg nutes 1st, bloom 2nd ect) first a and then b and PH Down
What is the TDS/EC/PPM you are using? 0,4ec
What is the pH of the "Tank"? ca 6
When was your last watering? Yesterday
When was your last feeding change? (ie. grow-bloom-micro-additional)
What size bulb are you using? 2x600w hps
What is the distance to the canopy? 50cm
What is your RH Factor(Relative Humidity)? unknown
What is the canopy temperature? 24-27celsius
What is the Day/Night Temp? (Include flucutaion range)4-5 celsius
What is the current Air Flow? (cfm etc.) 425m3
Tell us about your ventilation, intake exhaust and when its running and not running ?
Is the fan blowing directly at plants? No
Is your water HARD or SOFT? unknown my meter dont read below 0,2
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water?tap water

 

[KyndBud]

It looks like a magnesium or K deficiency to me, but its still kinda early. Coco is know to hold on to Ca, Mg, and K quite readily. Make sure your pH is around 6.3. If your using both 600w lights right now, I'd cut one back if your only growing a few plants. They don't need quite as intense light in veg as they do in flowering. The added heat might be causing a few problems, though you say the canopy is around 27c/80f? Not too shabby. My guess is Mg or K deficiency.

Peace KB

 

[slimj]

i use drops to check ph,so i use to adjust to about 6 in color. i have understood to be 5.8-6,1 in coco.
are not ph6,3 a little high?
has managed to lower the temperatures of 71f.

peace

 

[KyndBud]

A pH of 6-6.3 would put you in the range to allow more potassium and magnesium uptake according to the pH nutrient availability chart, so raising your pH a bit might help. Adding more K and Mg would fix the problem though.

Peace
KB

 

[Heathinv]

yeah, definitely put your pH into check.