I have always under fed to be safe, your right on there.
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Also if you are growing in soil the right ph is just as important. If your PH is off, the plant will lock out and not feed at all. 6.5 ph is optimum. Lower than that it wonât matter what you feed them, they will not take it in.
Water is 5.5 to 5.8/ Try to keep it around these numbers. thanks
Are you growing in water or soil?
soil; foxfarm
Bump that ph up to around 6.5
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Thanks for the info. that is why this site is very good to find what needs to be done. a big hit to all
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Soil with lots of drainage in 5gallon fabric pots
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NoâŚI basically use organicâŚNECTAR FOR THE GODSâŚfantastic stuff easy to use once you forget everything you learned about using syntheticsâŚa bit $$$$âŚbut well worth it
Thatâs way lowâŚyour plants probably arenât eating good and takes for ever to dry for next feeding
thanks for your info. really appreciate everyone who can help
Anything below 6.5 in soil creates lockout of calcium and magnesium. Soil or Coco would best best in the 5,8 -5.9 range. Calcium and Magnesium are two of the most important nutrients a marijuana plant needs. And if youâre not in the right range it doesnât matter how much Cal-Mag you give them. Theyâre not going to take it in.
@GFDuke Regarding the soil PH you mentioned anything below 6.5 the plant is locked out of up taking Cal/Mag Iâve been battling what I feel is a Cal/Mag deficiency. I did a slurry test like FF recommends in the FFOF Iâm using and my results for each plant were
MG#1 pH 5.6 Ppm 1020
MG#2 pH 5.8 Ppm 964
No nutritional supplement has been added as I was told FF had nutes for about 6weeks. I transplanted on 5/22/20 into the FFOF so they have only been in the soil for 19 days.
What exactly are you saying. What i got from your post is that your ph is low for soil. But I and most growers prefer a run off ph test. Not a slurry test. Your ppms are fine. But you need to raise your ph.
@GFDuke You answered what I was after, which was just a good reference for PPM readings. Going to increase my H2o pH to 7.0 next two waterings. Both the slurry and my runoffâs are in the same ballpark as far as pH and PPM numbers. So it looks like I need to get my soil pH up. Thank you for taking the time to respond 
Hi Bobby, Iâm mixing GH exactly as called out on the bottles and Iâm getting 2300ppm of nutrients before I add. Iâm getting 1600 on the runoff. Thoughts?
Itâs good that your runoff is lower than your input. I am not familiar with GH nutes but your output isnât bad. Are you having any issues?
Thanks Bobby, these auto flowers are 7 weeks old and I started seeing what looks like burning to me?
I did just change from Veg nutrients to flowering nutes this week. I thought perhaps it wasnât getting enough phosphorous & potassium?