I think I just read somewhere else on here that Si is a component of ProTeKt. You'll find tapla's post talking about it on the provided link below

Here is a link that might be useful: Tapla's comment on Pro-TeKt Si content

Yes, definitely answers my question.
As for the Pro-tekt: The Dyna Gro is marketed in my country, but not ProTekt specifically.
Bamboo cultivation is not a common practice here, though I have seen it grown in the city of Aqaba, in Jordan, right across the border. (Yes, in the hot desert).

As for the potting mix, we use bamboo skewers for barbecue, and it is fairly simple to take some bamboo sticks, cover them with potting soil, keep it moist and let them decay slowly. (They become brittle). The process may take some time to complete, and by spring I will have it ready for planting. I will plant grasses (which are known to take-up silicone) in this mix alongside a control mix with no bamboo chips, for comparison.

You mean Silicon, which is an element.

NOT Silicone, which are a variety of man made polymers.

Equisetum and Bamboo species incorporate the element silicon in their tissues. (Yes, now I see that the added 'e' has created some confusion) What MiniChopper4Me has posted me is the link to the answer. The fertilizer is not available in my area, so I must use a biological source of silicon to make-up for it.

There are two ways:

The slow way: Add chipped bamboo or equisetum to my potting soil. From my experience, peat moss will allow bamboo skewers to degrade and become brittle.

The fast way: Burn the silicon source and add it as silicon "ash".

I still have to experiment and find the right one for me.