desiBud420
New Member
Hi,
This is my first grow with 2 photo females in a grow box for a little over 2.5 weeks now. I have two young ladies that are just 2.5 weeks old and sprouting nicely. I only noticed on my last topsoil water spray session that one of the plants, on it's first set of single leaves above the cotyledons, the tips of the 2 single leaves are a tiny bit yellow and maybe look like they're curling a bit downwards. Both tips are equally yellow and only at the bare tip.
Magnified it for a better look. Quick snap of inside grow box. 84w (400w output white light), and a new addition lately for a slight range of color wavelength with a 20w (100w output light). I figure I have 500watt output in total which should be enough at 2-4 inches. I also thought to wait until the plants got into the 3rd week to push their watt limits for stronger growth in these light wavelengths for my budget so I only had the 85w cfl to start with, which did fine earlier.
My questions revolve around a bit of my own diagnosis and question as follows:
1) are the lights too close or has addition of 20w bulb recently added too much light, or is 2 inches too short at this point in grow?. I feel it's light burn even though the airflow inside is pretty good, a bit more than necessary I feel with a 120x120x38mm PC fan with airflow of 115cfm (no dimmer attached). Note I can keep my hand right above the plant and not feel any burn or discomfort at the 1.5-2 inches distance between cfls and plant tops. I Rotate the pots every few hours and make sure they get a 360 spin throughout the 18 hour light cycle and move them between each other and exchange spots once per day. There was no problem before the 20w warm light, and the other plant is also blooming, but no early tip yellowing on that one. Both have same soil and spray/watering feeds the same (or rarely when extra needed). Different strains so I guess that factors in as well.
2) soil pH is set after watering with about 6.7-7 pH according to pH strips I got. I don't like their accuracy but are eSier to use and throw unlike maintaining electronic pH detectors with pH balance solution, which I can't get readily available here, but quite high maintainence for my taste. I Added limestone sprinkle to soilless, organic dry manure, and peatmoss at the time of potting the germed seedling. . Ratio 1/1/2 ... Can't get vermiculite/perlite here so I make do. No nutes till 4th week unless a deficiency occurs, which I fear at this point early in the grow.
3) grow box temp wanders from 25-27'C (77-83'F) depending on time of day/night and I actively use my a/c to stabilise the heat from the cfls as does the speedy PC fan together. Again I feel the pull is a bit more than necessary and not sure how to slow it down without a dimmer or some filter material to cover my air intake flaps with. This is the model I have jammed in there.
4) if anything else this also looks like the pre-signs of a Nitrogen or Copper deficiency, or is it light burn to me.
So temp, water/soil pH, airflow, lights and nutrients. Who is the culprit if not a combo?
I thought it's better to get some logical opinions while I can catch a deficiency in it's initial stages.
This is my first grow with 2 photo females in a grow box for a little over 2.5 weeks now. I have two young ladies that are just 2.5 weeks old and sprouting nicely. I only noticed on my last topsoil water spray session that one of the plants, on it's first set of single leaves above the cotyledons, the tips of the 2 single leaves are a tiny bit yellow and maybe look like they're curling a bit downwards. Both tips are equally yellow and only at the bare tip.
Magnified it for a better look. Quick snap of inside grow box. 84w (400w output white light), and a new addition lately for a slight range of color wavelength with a 20w (100w output light). I figure I have 500watt output in total which should be enough at 2-4 inches. I also thought to wait until the plants got into the 3rd week to push their watt limits for stronger growth in these light wavelengths for my budget so I only had the 85w cfl to start with, which did fine earlier.
My questions revolve around a bit of my own diagnosis and question as follows:
1) are the lights too close or has addition of 20w bulb recently added too much light, or is 2 inches too short at this point in grow?. I feel it's light burn even though the airflow inside is pretty good, a bit more than necessary I feel with a 120x120x38mm PC fan with airflow of 115cfm (no dimmer attached). Note I can keep my hand right above the plant and not feel any burn or discomfort at the 1.5-2 inches distance between cfls and plant tops. I Rotate the pots every few hours and make sure they get a 360 spin throughout the 18 hour light cycle and move them between each other and exchange spots once per day. There was no problem before the 20w warm light, and the other plant is also blooming, but no early tip yellowing on that one. Both have same soil and spray/watering feeds the same (or rarely when extra needed). Different strains so I guess that factors in as well.
2) soil pH is set after watering with about 6.7-7 pH according to pH strips I got. I don't like their accuracy but are eSier to use and throw unlike maintaining electronic pH detectors with pH balance solution, which I can't get readily available here, but quite high maintainence for my taste. I Added limestone sprinkle to soilless, organic dry manure, and peatmoss at the time of potting the germed seedling. . Ratio 1/1/2 ... Can't get vermiculite/perlite here so I make do. No nutes till 4th week unless a deficiency occurs, which I fear at this point early in the grow.
3) grow box temp wanders from 25-27'C (77-83'F) depending on time of day/night and I actively use my a/c to stabilise the heat from the cfls as does the speedy PC fan together. Again I feel the pull is a bit more than necessary and not sure how to slow it down without a dimmer or some filter material to cover my air intake flaps with. This is the model I have jammed in there.
4) if anything else this also looks like the pre-signs of a Nitrogen or Copper deficiency, or is it light burn to me.
So temp, water/soil pH, airflow, lights and nutrients. Who is the culprit if not a combo?
I thought it's better to get some logical opinions while I can catch a deficiency in it's initial stages.
