The Grow Awards 2026 🏆 
Question to co² experts
GrowYourFivestarted grow question 3y ago
Grower friends! Question for co2 experts! I have an idea about yesterday's question .. My light is 1700 ppfd, co2 - 1200, but the nutrient solution was filled in 1100, as the manufacturer indicates, but I realized that this is not enough, now I'm trying to water 1400ppm +
likes
Ezzjaybruhanswered grow question 3y ago
I believe you are overfeeding honestly. If I run off is + 500 or so.. you could have build up in the medium.
Frankly 1700 umols is a LOT even with supplemental co2.
I wouldn’t go up to 1400 ppm.
Make sure your pH is where it should be. I run a point or two below 6 in Veg with coco/perlite.
I personally know a lot of commercial growers running similar set ups with co2 and none of them ever go above 1300 or 1400 umols/m2/sec.. especially in Veg. Those numbers are reserved for week 3-4 flower and that’s it. I can find you some charts for PPM/UMols/CO2 from commercial growers if you are interested DM me.
Similar Grow Questions
Solved
prebiancagrower
My first issue in my first growth :-(Hi Guys, could you help me here?
It is my first growth, I have no idea what is happening with these two girls.
The second week, I change the pots two days ago.
The leaves are withered and the biggest plant the are some yellow parts :-(
Every detail is inside my Diary.
Thanks.Leaves. Color - Yellow
Plant. Stem - Weak
Feeding. Chemical composition
3y ago
1
1
Solved
kalmiata
How dark is too dark?Are these looking too green? I’m not seeing any N-tox clawing but they are pretty dark, growth is pretty vigorous and steady though so I don’t know. They are in a pretty rich organic medium.Leaves. Other
Feeding. Chemical composition
3y ago
2
3
Solved
Hydronaut
GH Calculator - PPM Levels / Add Backs - AutoflowersI added my revised auto feeding chart I created for my Auto journey using GH Trio+ nutrients. This active spreadsheet makes add-backs and feeding schedules a snap. Are we getting on track here with PPM levels for Autos?Week 5
Feeding. Chemical composition
4y ago
3
4
Solved
AmcasssP
Hormone. Pure Do you have any suggestions regarding cytokinin hormone and IBA administration?Feeding. Chemical composition
2mo ago
5
5
Solved
Solodolo47
Feeding for HydroponicsWhat’s the preferable range for PPM?Week 2
Feeding. Chemical composition
5y ago
1
Solved
biuxiuer
我的女孩怎麼了，這個是生病了嗎？還是太多的餵食？在他長出第二對葉子的時候這樣的現象就出現了，但是只有一邊有葉子，我查了相關資料顯示這是菸草鑲嵌病毒（Tobacco mosaic virus；TMV）
我覺得挺像的。但是不是很確定，我該繼續等幾天嗎？還是把葉子切掉。
誰可以告訴我解決方法，希望他可以度過生長期，因為他是自動開花，每一天都很重要。Leaves. Curl up
Leaves. Veins - yellow between
Feeding. Chemical composition
4y ago
3
3
Solved
GoGoh
How is Epsom salt used for watering?How is Epsom salt used for watering?Feeding. Schedule
Feeding. Chemical composition
Feeding. Deficiences
3y ago
6
3
Solved
Willy_Balls
Canna boost and autopotsHI!
I have a question regarding Canna Boost and autopots. Do you use it in a reservoir? The ph is rising faster in res since I added it. The nutrient solution in res also got cloudy and trays became slimy. Since I use airdromes the ph also rised too much.3y ago
3
4
Solved
Jeffrokush
Thanks!!Thank you Randyr , here is my latest addition to my plants in early to mid vegetation. I didn’t want to risk lock out so I added minimal amounts of most of the nutes to the girls!! Any suggestions. Or advice!!! I would like to learn more .. Thank you for liking and following..Week 6
Feeding. Chemical composition
5y ago
1
2
Solved
romeoromeo
FertilizerComplete NPK fertilizer with trace elements as OEDF chelates. NPK 3,5–2,3–5,0 (Fe, Mn, Zn) Is this a good one for 2 week veg stage?Feeding. Chemical composition
Feeding. Other
4y ago
1
1
Solved
Komar85
Compost teaDid anyone use dextrose instead molasses during compost tea brewing?Feeding. Chemical composition
5y ago
2
3
Solved
Knert
What granular feeder should I give my autoflower at D35?She's at day 34 now, and I'm wateriring her tomorrow. I have phosporous grains (6-16-0) and potassium grains (2-0-20). She's been in proflowering for about a week and I'm wondering what fertilisers I should add tomorrow. Just P or should I add some K as well? See details in diary6y ago
2
Solved
OneDropOfTHC
GHE Nuctrients-Wich one should i guide myself? the bottles or the chart?I used this this nucts on a grow few years back, plant never showed defeciencies, but wasent very big either.
So i the bottle it says 7ml's per 10l, but in this chart i pulled ot of their site it goes as far as 29ml per 10l.
Wich one should i guide myself? Is the chart too heavyFeeding. Chemical composition
5y ago
1
4
Solved
Phoenix_Down_Alchemist
High pH run-off?Just measured my runoff--came in at pH 7.25 w/EC 1400 and ppm of 750. I'm quite confused considering I've never watered above pH 6.5 and the past few weeks I've gradually increased from 5.9 to 6.3. I have added an additional Coco top dressing w/diatomaceous earth and brocolli?Week 11
Feeding. Chemical composition
4y ago
2
3
Solved
Qaggy
MolassesI’m growing completely organic, using comfrey and nettle tea. I’m wanting to use some organic molasses and wondering if anyone can tell me how much to use?Week 4
Feeding. Chemical composition
5y ago
3
4
Solved
MiyamotoMusashi
Hello growers, do you a good source of information about feeding autoflowering, ec, ph and feeding in general? video or blog are idealOther. General questions
Feeding. Schedule
Feeding. Chemical composition
4y ago
3