Originally Posted by treble
I dont go much below 6.5 and I doubt I could hold it at 5.8 - 6.0 in my res... I dont know but if its correct I will be prepared to try... need to see what the concensus is and look around some more
Hydro in general is 6 to 6.5 with the only plant I know liking lower is lettuce at 5.8 I got this from Hydroponics: a practical guide for the soilless grower
by Benton Jones at the Univ. of Ga. I asked Howard Resh, an internationally recognized hydro grower, and he said 6 to 6.5 with the lettuce exclusion too. I like 6 ph for hydro.
Soilless 5.6-6.2 I got this from David Reed at Texas Tech in Water, media, and nutrition for greenhouse crops
Outdoors in the ground 5.8-6.5 I got this from Clemson Univ.
I need a better chart than the one I presented. I am not really sure about hydro because it has been 15 years since I did it at a university. I don't remember adjusting ph.
start to happen growing below 5 and above 7.