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Where is this published? ADHS says they won't be accepting applications until April: http://www.azdhs.gov/prop203/calendar.htm

Just as an aside, Miracle Grow All Purpose uses urea as its primary nitrogen source: http://www.scottsaustralia.com.au/images/MSDS/Miracle_Gro_Rose_Food__1034_.pdf I ran some experiments a few years back, growing plants in sterile tissue culture using urea as the nitrogen source. The results...

This table may help. Note that while some are more available at slightly higher pH, rainwater is typically around pH 5.6. Although it has no dissolved solids in it, rainwater is not pH 7.0 because it has a tiny amount of carbon dioxide dissolved in it, forming carbonic acid.

A "T" or "tee" connector, perhaps?

Pro-TeKt silica is potassium silicate, which is an alkaline compound. So, yeah- it'll raise the pH.

I have extensive freeze-drying experience when it comes to plant parts; the main reason that DIY freeze-drying may not work well is that unless there's a trap in there to capture the moisture, you dump the water into the pump oil and it gets foamy and messy. Just as important, once there's water...

You probably have potassium hydroxide; be careful with the stuff: its cousin sodium hydroxide is caustic lye. It will generate heat when dissolved, but 1/4 tsp per quart of water will be safe- the heat will be absorbed quickly. More concentrated solutions are much more dangerous. Unless you get...

Distilled water has no buffering capacity; every time you add something to change the pH (typically phosphoric acid to lower the pH, and potassium hydroxide to raise it), it'll overshoot. Add back in 10% tap water, or add a buffer like citric acid- or use a buffered nutrient formulation before...

Calibration solution is good for months, even years, provided it is used correctly. Don't dilute it, don't contaminate it; before moving your probe between calibration solutions, wash it and VERY gently dry it with a tissue- just wick the water away, don't actually touch the glass. You'll also...

I think you misunderstood me; I was addressing your note that you couldn't recall why DI isn't all that good for growing. No buffering = lousy stuff when it comes to pH swings. If you're looking for a decent standard, I'd suggest something like AquaFina, which is produced by Coca Cola. The...

Looks like they "accidentally" released the locations of grow ops in Colorado: http://www.denverpost.com/news/ci_17034819 The written comment period is closed, but there are still public meetings coming up: http://www.azdhs.gov/prop203/calendar.htm Make sure to bring up the subject of...

Distilled water is "too much" in that you've removed virtually all of the solutes, so there's no buffering capacity: the slightest change or addition to the water will cause wild pH swings. At the other end of the spectrum is water that is "too hard," like that found in cities that get surface...

Right- but yogurt is milk that has been lactofermented; the whole purpose is to consume the lactose- which comprises the sole sugar present in milk (5.05 grams per 100 grams fluid milk). Much of this is converted to lactic acid, which inhibits the growth of organisms. I have no doubt milk may...

Yogurt may actually inhibit the growth of other organisms. The organisms that are used to culture milk grow quickly, and produce lactic acid (among other compounds) to reduce growth of competitors. You may find that cultured milk inhibits the growth of soil organisms.

Why, thanks. It really is amazing stuff; keeps me busy. May I ask if you grow professionally?

Some excellent points made by the good doctor. Of particular amusement: "Arizona's pharmacies and physician offices dispense addictive, dangerous, and toxic drugs that, unlike marijuana, are potentially deadly, yet Arizona's pharmacies and physician offices are not required to have 12 foot...

Big box hardware stores (Home Depot and Lowes) usually have a decent selection of adapters and widgets in the irrigation supplies aisle. Bring in the appropriate pieces so they can select the right parts for your work. If you're in a rush, there's no reason you couldn't heat-stretch the parts...

I agree- that's the correct assessment. Conventional practices (seeds and cuttings) have been used for many years, with great success. It would take a particularly large operation to demand a tissue culture facility, but TC is used even for ornamental crops, such as those found at the hardware...

To answer your previous question, you can use any pH probe, provided the connector is correct. There are also adapters, but it's easiest to just get the right kind to begin with. Out of curiosity, if you try to measure the pH 4.01 standard, does it at least read it accurately, even if it won't...

From what I understand, it's the nut jobs that try to "improve" colloidal silver by making it with soluble silver nitrate that have the problems with argyria. Silver particles such as those produced by electrolysis aren't the problem- it's folks who use silver nitrate solution to put even MORE...