What is "available water" and how is it measured?

Simon, don't they dry out after 2-3 weeks?

For what its worth, that second website is not Russian. It is Ukrainian.

Does it make a difference if you use a wide, squat pot or a deep pot of the same diameter?

How much is citrus flavor influenced by environmental conditions during fruiting? Could differences in environmental conditions be responsible for the different opinions people have about fruit flavor? For example, my wife and I agreed that my NZL fruit tasted a lot like lemonade.

Is it safe to use Hi-Yield brand spreader/sticker with Neem oil?
Will it act as an emulsifier of the oil?

Millet, thank you for your replies.
I decided to keep the greenhouse temps set at 55 F and allow daytime temps to reach mid 70's due to solar heating. I will move the seedlings out of the greenhouse and into my home and put them under lights with temps of about 65 - 70 F in order to get maximum growth.
Does this sound like a reasonable plan?

Thank you Isaac for the article. I am sorry I was not clearer in my post. The article states that maximum root growth occurs at temps between 72 and 81F although I recall that citrus roots function properly down to 57F.  So, for my 1 – 3 year seedlings, I would ideally want to maintain temps between 72 and 81F for maximum growth, presumably day and night.  However, I believe my older trees require a cold period to induce fruit set. If so, what are the day and night temperature requirements and the duration of these temperatures?

What is the temp in the greenhouse?

I gave up on Flying Fox. I got no replies to emails after waiting months. That is no way to run a business.

Where did your friend get it?

Where does that value of two years for average life span of citrus in containers come from?

Is Adam still in business? I have sent him a couple of emails months ago inquiring about purchasing  jaboticabas and he has not replied.