This is a 3 week old seedling.
during the last 3 days it seems to have been suffering from stunned growth. new growth is turning very bright yellowish green, and bottom leafs start turning yellow with brown spots.
in addition i have started noticing a slight purpling of the stem. (all problems visible in attached pictures).
I flushed the soil with X3 volume of pot just now. PH of runoff is 7.3-4 PH, watering with 6.5 PH water.
Seedling is kept at 84-93 degrees (F) during light hours (18H), 75-79 degrees (F) during dark period (6H), humidity is less than 20% at all times (desert climate). Current lighting is 2 45W Soft Blue CFLs (next stage is 250W HPS + Multiple side CFLs)
Soil is mostly peat with coconut fiber, soil used for growing in the past with no problems at all.
There are 3 other seedlings under the exact same conditions that look nice and healthy, no signs of problems.
What should i be looking into?
New growth + yellowing lower leaves: http://anony.ws/di-3XBM.jpg
Purpling of stem: http://anony.ws/di-P73E.jpg
during the last 3 days it seems to have been suffering from stunned growth. new growth is turning very bright yellowish green, and bottom leafs start turning yellow with brown spots.
in addition i have started noticing a slight purpling of the stem. (all problems visible in attached pictures).
I flushed the soil with X3 volume of pot just now. PH of runoff is 7.3-4 PH, watering with 6.5 PH water.
Seedling is kept at 84-93 degrees (F) during light hours (18H), 75-79 degrees (F) during dark period (6H), humidity is less than 20% at all times (desert climate). Current lighting is 2 45W Soft Blue CFLs (next stage is 250W HPS + Multiple side CFLs)
Soil is mostly peat with coconut fiber, soil used for growing in the past with no problems at all.
There are 3 other seedlings under the exact same conditions that look nice and healthy, no signs of problems.
What should i be looking into?
New growth + yellowing lower leaves: http://anony.ws/di-3XBM.jpg
Purpling of stem: http://anony.ws/di-P73E.jpg