Problem:
- Brown/Bronze leaf discolouration on multiply leaves affected only the largest plant. First noticed 4 days ago. The other 3 plants share the same reservoir, (2 other of the same strain and one buba kush).
- Redish/purple stems can be seen on all plants but the one with leaf discolouration seems less redish/purple.
- Roots seem white and healthy.
- First time grower
- All plants droop about an hour before bed time but are all perky before lights on next day.
Medium/grow method:
DWC with 20 l/m (316 GPH) air-pump and chiller
7 Day nuturient change out cycle.
Feed: and supplements used:
General Hydroponics Flora Micro/Gro/Bloom in equal ratio. (0.5 tsp per gallon / 6.5 ml per 10 l)
General Hydroponics Calimagic (5ml per gallon / 1ml per 1l)
PHed with Phosphoric Acid
Hydrogen Peroxide at 44ppm (daily dosing)
Water source:
Tap Water Low EC < 0.1 (check with secondary probe and both recently calibrated)
PH starts at 7.8 before PHing to 5.8
Strain/age:
G13 about 4 weeks from seed (had a few problems so far, too cold overnight, and using citric acid as ph down, no humidifier)
Light used:
Mars Hydro 400 LED without grow/bloom switches (eg bloom spectruim in veg) 16/8 Light Cycle
Distance: 50cm (20 inch)
Climate:
Light Cycle: 24.0 C (75.2F) Humidity: 50 to 55%
Dark Cycle: 19.0C (66.2F) Humidity: 40 to 45%
Reservoir Water keep bellow 19.5 C (67F)
Additional info:
Stable PH between 5.7 -> 5.8
EC Level: (Start of cycle) 1.3 -> (End) 1.0
Changes around the time it developed:
- Added Humidifer
- Full strength Calimagic (was 1/2 before)
- Full strength Peroxide (was 1/2 before)
Image Notes:
Water drops in photos not usual, had a problem with the humidifier for 2 hours, causing the humidity to reach 70%, problem existed before issue.
Image 1: First affected leaf on plant
Image 2: Whole plant top shot (affected leaf in about the 9o'clock position, new leaf about 8'clock)
Image 3: Same leaf removed from plant
Image 4: Same leaf under different light
Image 5: Time series of new affected leaf.
Please ask questions, i'll do my best to answer.
About todo a reservoir change tomorrow, so any nutrient change suggestion welcomed.
Thankyou for your time.
- Brown/Bronze leaf discolouration on multiply leaves affected only the largest plant. First noticed 4 days ago. The other 3 plants share the same reservoir, (2 other of the same strain and one buba kush).
- Redish/purple stems can be seen on all plants but the one with leaf discolouration seems less redish/purple.
- Roots seem white and healthy.
- First time grower
- All plants droop about an hour before bed time but are all perky before lights on next day.
Medium/grow method:
DWC with 20 l/m (316 GPH) air-pump and chiller
7 Day nuturient change out cycle.
Feed: and supplements used:
General Hydroponics Flora Micro/Gro/Bloom in equal ratio. (0.5 tsp per gallon / 6.5 ml per 10 l)
General Hydroponics Calimagic (5ml per gallon / 1ml per 1l)
PHed with Phosphoric Acid
Hydrogen Peroxide at 44ppm (daily dosing)
Water source:
Tap Water Low EC < 0.1 (check with secondary probe and both recently calibrated)
PH starts at 7.8 before PHing to 5.8
Strain/age:
G13 about 4 weeks from seed (had a few problems so far, too cold overnight, and using citric acid as ph down, no humidifier)
Light used:
Mars Hydro 400 LED without grow/bloom switches (eg bloom spectruim in veg) 16/8 Light Cycle
Distance: 50cm (20 inch)
Climate:
Light Cycle: 24.0 C (75.2F) Humidity: 50 to 55%
Dark Cycle: 19.0C (66.2F) Humidity: 40 to 45%
Reservoir Water keep bellow 19.5 C (67F)
Additional info:
Stable PH between 5.7 -> 5.8
EC Level: (Start of cycle) 1.3 -> (End) 1.0
Changes around the time it developed:
- Added Humidifer
- Full strength Calimagic (was 1/2 before)
- Full strength Peroxide (was 1/2 before)
Image Notes:
Water drops in photos not usual, had a problem with the humidifier for 2 hours, causing the humidity to reach 70%, problem existed before issue.
Image 1: First affected leaf on plant
Image 2: Whole plant top shot (affected leaf in about the 9o'clock position, new leaf about 8'clock)
Image 3: Same leaf removed from plant
Image 4: Same leaf under different light
Image 5: Time series of new affected leaf.
Please ask questions, i'll do my best to answer.
About todo a reservoir change tomorrow, so any nutrient change suggestion welcomed.
Thankyou for your time.
thanks for the proper solid info Frank! I may call in a hydro-savvy mate to confer, but from what I see it looks like P defc.,... just the one plant? The other is OK I gather,... I'd say the env. stuff looks OK, save whatever cool spell you mentioned,.. that can affect P uptake and transport a lot, so can any pH hiccup,...how cold did it get, and how long? Are symptoms still progressing? EC seems OK,... yeah, citric acid lacks staying power, so between the cool and this, it might be what tipped this off,...
