I live in a city and use urban tap water for my hydro system. Is there any reason to believe that there would be a Cal/Mag deficiency in regular urban tap water or is that encountered more in RO or distilled water? I'm thinking that my plants sudden display of difficulties might be this or phosporous deficiency but I don't know my ass from my elbow when it comes to this.
My plants (three to four week old from germ) are looking pretty shitty in the DWC set up I have. I'm using PBP Veg and Liquid Karma at about 2/3 strength. I have not previously had trouble with this nute combination when I grew the last time...5 years ago. I had thought that there might have been a nitrogen deficiency because many of the bottom leaves looked yellow and I had been very sparing with the previous batch of nutes when the plants were younger. However, today I came down and saw the best looking plant had developed some some of almost purplish mosaic stuff on the bottom leaves as well. I'm thinking that is fits the description of phosphorous deficiency...surprising given the nutes but figuring out a plant's troubles has always been a very troubling and inexact science for me. I did notice that the pH seems to have gone up from yesterday to 6.1pH...and have read that phosphorous can get locked out at that level. I'm surprised that it would have happened that quick, however.
I'm sorry I don't have any pictures yet. I don't have a digital camera at this point.
Anyhow...any thoughts would be appreciated. Thanks. My system is as follows...two reservoirs holding, in total, 25 gallons that constantly circulate via water pump. A fourteen hole tray sits on top of the upper res. The temps are higher than I would like...about 72F for the res solution but I'm trying to hold things down with frozen bottles of water. Hopefully as the weather cools the res will cool as well. I just put in the new batch of nutes on Tuesday. I had previously had the nutes at a much weaker strength for a weak. FWIW, the ppm is between 700 and 800.
My plants (three to four week old from germ) are looking pretty shitty in the DWC set up I have. I'm using PBP Veg and Liquid Karma at about 2/3 strength. I have not previously had trouble with this nute combination when I grew the last time...5 years ago. I had thought that there might have been a nitrogen deficiency because many of the bottom leaves looked yellow and I had been very sparing with the previous batch of nutes when the plants were younger. However, today I came down and saw the best looking plant had developed some some of almost purplish mosaic stuff on the bottom leaves as well. I'm thinking that is fits the description of phosphorous deficiency...surprising given the nutes but figuring out a plant's troubles has always been a very troubling and inexact science for me. I did notice that the pH seems to have gone up from yesterday to 6.1pH...and have read that phosphorous can get locked out at that level. I'm surprised that it would have happened that quick, however.
I'm sorry I don't have any pictures yet. I don't have a digital camera at this point.
Anyhow...any thoughts would be appreciated. Thanks. My system is as follows...two reservoirs holding, in total, 25 gallons that constantly circulate via water pump. A fourteen hole tray sits on top of the upper res. The temps are higher than I would like...about 72F for the res solution but I'm trying to hold things down with frozen bottles of water. Hopefully as the weather cools the res will cool as well. I just put in the new batch of nutes on Tuesday. I had previously had the nutes at a much weaker strength for a weak. FWIW, the ppm is between 700 and 800.