weed_johnz
New Member
Hi you all!!
This is my first thread here, and I'm still learning the rules, so i'd like to say sorry in advance for any improper comment, out of place subject, or any trespass to the forum rules; also I would like to say sorry if any of my messages causes any disruption to anyone. It's not my intent to harm or affect someone, I'm here purely to learn and be better at growing my girls...
So, with that out of the way, let's expose my problem.
I have been growing for about 5 years in soil, and so I decided to give Hydroponics a try... after a lot of research (and I mean A LOT), I decided to start with a Deep Water Culture (DWC).
My system is fairly simple:
- Reservoir: 5 gallon bucket with a hose for level/nutrient change (IWS OxyPot)
- Aeration: air-stone and air pump
- Medium: rockwool and Arlite (expanded clay pebbles)
- Light: 400W High Pressure Sodium
- Ventilation: single fan pointed at light bulb for temp control and 1 exhaust fan for air change
The normal conditions inside my indoor are as follows:
- Humidity: ~ 40% (sometimes as low as 30%)
- Temp: 25°C-29°C (77°F-85°F)
- Ph: 5.8-6.3
- EC: ~800 µs/cm (attention with the units!! its not milli, its micro!!)
- PPM: ~400ppm
Nutes are Plagron 100% Hydro A + B, plus some phosphoric acid from the Ph Down from advanced hydroponics, and CalMag from GroTek.
Now, with the problem at hand: I have a Northern Lights Auto growing, it's about five week old from seed (sprouted at Sep-9-2017, now its Oct-10-2017), and it shows some deficiencies I haven't seen before. It's really similar to nitrogen or magnesium deficiency, with a light color between the leaf's veins, and some of the lower leafs have the tips with necrosis. I double checked the nutes, but it's getting all it needs as far as I can see. Also, some leafs have rusted colored spots all over them, like they're rusting, and some have just regular yellow spots, and almost all the leafs have curled at the tip (not the border, the tip, the infamous eagle claw), but I'm pretty sure it's not Nitrogen toxicity, so I'm really baffled about this situation.
My guest is this seems to be a phosphorus toxicity due to the repeated use of phosphoric acid in the ph down I'm using, but since I'm not certain about this, I would rather ask to the experts
.
I'm uploading some photos, but I will upload some more when I get home to be more explicit about the symptoms it's manifesting.
Any help would be appreciated.
Cheers and Good Smokes for ya'll!!
This is my first thread here, and I'm still learning the rules, so i'd like to say sorry in advance for any improper comment, out of place subject, or any trespass to the forum rules; also I would like to say sorry if any of my messages causes any disruption to anyone. It's not my intent to harm or affect someone, I'm here purely to learn and be better at growing my girls...
So, with that out of the way, let's expose my problem.
I have been growing for about 5 years in soil, and so I decided to give Hydroponics a try... after a lot of research (and I mean A LOT), I decided to start with a Deep Water Culture (DWC).
My system is fairly simple:
- Reservoir: 5 gallon bucket with a hose for level/nutrient change (IWS OxyPot)
- Aeration: air-stone and air pump
- Medium: rockwool and Arlite (expanded clay pebbles)
- Light: 400W High Pressure Sodium
- Ventilation: single fan pointed at light bulb for temp control and 1 exhaust fan for air change
The normal conditions inside my indoor are as follows:
- Humidity: ~ 40% (sometimes as low as 30%)
- Temp: 25°C-29°C (77°F-85°F)
- Ph: 5.8-6.3
- EC: ~800 µs/cm (attention with the units!! its not milli, its micro!!)
- PPM: ~400ppm
Nutes are Plagron 100% Hydro A + B, plus some phosphoric acid from the Ph Down from advanced hydroponics, and CalMag from GroTek.
Now, with the problem at hand: I have a Northern Lights Auto growing, it's about five week old from seed (sprouted at Sep-9-2017, now its Oct-10-2017), and it shows some deficiencies I haven't seen before. It's really similar to nitrogen or magnesium deficiency, with a light color between the leaf's veins, and some of the lower leafs have the tips with necrosis. I double checked the nutes, but it's getting all it needs as far as I can see. Also, some leafs have rusted colored spots all over them, like they're rusting, and some have just regular yellow spots, and almost all the leafs have curled at the tip (not the border, the tip, the infamous eagle claw), but I'm pretty sure it's not Nitrogen toxicity, so I'm really baffled about this situation.
My guest is this seems to be a phosphorus toxicity due to the repeated use of phosphoric acid in the ph down I'm using, but since I'm not certain about this, I would rather ask to the experts
.I'm uploading some photos, but I will upload some more when I get home to be more explicit about the symptoms it's manifesting.
Any help would be appreciated.
Cheers and Good Smokes for ya'll!!
