Sangmang
Well-Known Member
Almost at week 4 of flower. Fan leaves are showing tip and edge burning/browning. Some have small dead spots. I had the same exact issue last grow but was using tap water and have switched to RO this grow. Im in coco and haven't exceeded 700ppm feeding. I'm feeding every 3 hours for 1 minute and get some runoff each time. Now for the first time my runoff ppm has increased(900) and my runoff ph has dropped to 5.0. I have a feeling that Nitrogen excess has something to do with this issue.
Typical feed
R/O water, coco, 1.5gal pots
150ppm epsom
100ppm CaliMagic(includes 1%N)
450ppm MGB(emerald harvest 3 part)
700ppm total
After mixing the res its at around 5.0ph and 12ml of ph up is needed in my 15gal DTW drip reservoir to reach 5.8-6
I'm on the Mid Flower ratio which is 2-5-10(G-M-B) and diluting to above strength.
I flushed today with calmag solution(300ppm) until the runoff was the same as input(300). I also further diluted my total res strength to 450ppm by adding more r/o water to the mixed res described above just to be safe.
My environment also may be the culprit. The RH has increased during this rainy week to about 60-65%. Temp is usually 75f. Could it be that transpiration is slow as a result and the plants are being burned? My fans run 24/7(440cfm vent and 3 small clip fans). 300w mars hydro tsl2000 20" above canopy.
On a side note, I have quite a lot of springtails(confirmed) in my medium. I will probably try to eliminate them to be safe although its generally accepted that they're harmless.
Very old fan leaf
Typical feed
R/O water, coco, 1.5gal pots
150ppm epsom
100ppm CaliMagic(includes 1%N)
450ppm MGB(emerald harvest 3 part)
700ppm total
After mixing the res its at around 5.0ph and 12ml of ph up is needed in my 15gal DTW drip reservoir to reach 5.8-6
I'm on the Mid Flower ratio which is 2-5-10(G-M-B) and diluting to above strength.
I flushed today with calmag solution(300ppm) until the runoff was the same as input(300). I also further diluted my total res strength to 450ppm by adding more r/o water to the mixed res described above just to be safe.
My environment also may be the culprit. The RH has increased during this rainy week to about 60-65%. Temp is usually 75f. Could it be that transpiration is slow as a result and the plants are being burned? My fans run 24/7(440cfm vent and 3 small clip fans). 300w mars hydro tsl2000 20" above canopy.
On a side note, I have quite a lot of springtails(confirmed) in my medium. I will probably try to eliminate them to be safe although its generally accepted that they're harmless.
Very old fan leaf