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positive.vibes
01-10-2010, 09:32 PM
So im interested in growing hydro, and, im about to probably use bubble-ponics...im thinking about making my own 5gallon bucket with a fish pump tube (ghetto-rigged) into it and just buy my own net-pot and hydroton...but im new and need ALOT of information on the ppm and tds. What is the difference between tds and ppm?
And how much things such as tds, ppm, or ph do i have to keep my eye on to successfuly grow hydro?
I need a 101 on bubble-ponics specifically.Please

Unregistered
01-12-2010, 12:26 PM
TDS and PPM are the same thing (TDS=total dissolved solids and PPM=parts per million [of total dissolved solids]). Measuring PPM and pH is extremely important. If either of these are too far off the mark, your plants will die.

For pH, you should test as often as you can. You want your pH to be between 5.5 and 6.5, with optimal pH usually being around 5.8. Checking once a day is usually sufficient.

With PPM you want to start your plants out conservatively at around 500 PPM and kick up the PPM by small intervals every time you change your resevoir until you notice burning at the tips of the leaves. That tells you when you want to scale back your PPM.

So yeah, a meter is a pretty important thing to have. Hope this helped!

bwizb
01-13-2010, 11:28 AM
I'm pretty sure TDS (total dissolved solids) is measured in PPM (parts per million). I'm not sure what a good number is, but that is my understanding of those 2 acronyms.

Unregistered
01-13-2010, 11:32 AM
TDS stands for "Total Dissolved Solids." PPM stands for "Parts Per Million" and is a measurement of TDS, so a TDS meter checks the PPM.

I ran a setup with six tomato plants in 5 gallons of water, and never checked the TDS once. As a general rule I changed the water once per week. I did it that way because I don't have any money for a meter. If you can get a meter, definitely do so. You can also get an EC meter (Electric Conductivity). Either one will work. Check the PPM or EC as often as you want, and as soon as it gets out of the appropriate range, change the water.

Here are the numbers you want to strive for:

TDS 500-1000ppm, EC .75-1.5

In a deep water culture system, aka bubbler, the PH can fluctuate wildly and you really need to keep an eye on it. In my six plant rubbermaid bubbler, the PH regulary jumped below 6 to 8 in a single day, and that's not good for the plants. Even if you adjust it, the fluctuation can cause a calcium deficiency due to the stress placed on the plant. So basically, check the PH every day, if it stays stable, you can get away with checking it once a day, maybe even every other day if you are lazy like me. Just do not let it get more than a couple tenths outside of the optimal range, or it will stress your plants.

You should keep the PH between 5.5-6.5 (5.9-6.1 is ideal). If it gets too high, add an acid (PH Down) to reduce the PH. If it gets too low, add an alkali (PH Up) to raise it. You can get acid and alkali from any hydroponic store, or any place you would buy equipment for an aquarium.

MDub86
01-13-2010, 04:32 PM
TDS and PPM are both the same thing. They are just two different acronyms for the concentration of the nutrients being fed to the plant.

John M.
01-13-2010, 06:29 PM
This chart can be found in the F.A.Q. section along with a detailed article about all things nutrition for hydroponics.

Vegetative for Hydroponics

Growth Stage
0.5 Conversion (ppm)
0.7 Conversion (ppm)
EC ( S)
pH

Clones/Seedlings
220-350
300-500
430-700
5.5-6.2

Week 1-2
400-550
600-800
850-1100
5.5-6.2

Week 3-4
550-700
800-1000
1100-1450
5.5-6.2

Flowering for Hydroponics

Week 1-2
700-850
1000-1200
1450-1700
5.5-6.2

Week 3-4
700-1000
1000-1400
1450-2000
5.5-6.2

Week 5-6
850-1000
1200-1400
1700-2000
5.5-6.2

Week 7-8
350-700
500-1000
700-1450
5.5-6.2