Autoflower | Dutch Passion | 26 Days From Seed| Possible Progressing Issue Diagnosing

[kickdrumheart]

Strain: Dutch Passion Think Different
Maturity: 26 days from germination
Medium: Rapid Rooter > Hydroton in DWC buckets (modified Waterfarm)
Environment: Indoor grow tent, max temp: 84, min temp: 71, 18/6 schedule, 432 Watt T5 Light
Nutrients: Weekly dose of GH 3-Part series per the feeding chart on their website (10 ml grow, 10 ml micro, 5 ml bloom per gallon of RO water)
pH: Currently 5.7, will likely even off at 5.8-5.9 after a bit.
PPM: 750-800

I am leaning towards a few causes: possibly too close to light - I raise a few inches; I worried the fan was too strong on the leaves so I tilted it a bit so provide less stress, potential magnesium or zinc deficiency maybe? Any thoughts or suggestions are greatly appreciated - I would really like to get this under control before it gets too out of hand.

 

[Farmer's Hat]

Looks like symptoms of Ph fluctuations...

Quick Summary: Managing pH is crucial for cannabis plants to be able to take up nutrients through their roots. When the pH around the roots jumps up and down, it can stress the plant and cause brown spots to appear on the leaves. Spotting on the leaves as a results of pH fluctuations is more common in hydroponic setups (where the pH tends to go up and down), but it is possible it can also happen in soil. This seems to often happen when the pH swings too high.
http://www.growweedeasy.com/ph-fluctuations-cannabis





New growth looks healthy.


Good Luck

 

[tooteefrootee]

Strain: Dutch Passion Think Different
Maturity: 26 days from germination
Medium: Rapid Rooter > Hydroton in DWC buckets (modified Waterfarm)
Environment: Indoor grow tent, max temp: 84, min temp: 71, 18/6 schedule, 432 Watt T5 Light
Nutrients: Weekly dose of GH 3-Part series per the feeding chart on their website (10 ml grow, 10 ml micro, 5 ml bloom per gallon of RO water)
pH: Currently 5.7, will likely even off at 5.8-5.9 after a bit.
PPM: 750-800

I am leaning towards a few causes: possibly too close to light - I raise a few inches; I worried the fan was too strong on the leaves so I tilted it a bit so provide less stress, potential magnesium or zinc deficiency maybe? Any thoughts or suggestions are greatly appreciated - I would really like to get this under control before it gets too out of hand.

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when you are mixing your gh 3 part, are you adding the micro FIRST to the RO water and letting it circulate real good BEFORE adding the other 2 parts? If you are not careful in adding the nutes to the res, the nutrients can "precipitate" or "lock out". and thus, leaving your plants hanging when it needs the micronutrients....When adding GH three part, Micro first, let it mix REAL GOOD, then GROW, let it mix real good, and last BLOOM, and let er mix real good before adding additives if you are using any...

 

[tooteefrootee]

...and if you are not running co2, that max temp needs to come down to 76 degrees avg. You want a night temp about 8 degrees cooler than that if you can reach it. Ph is ok, maybe come down on ppms to about 600 to 700 while the plants are small. some strains can take heavy feedings, some cant