plant growth regulators

I didn't know anything until I read your post, so I did some reading, and it's quite an interesting subject!

I haven't really had a good look, but hormone rooting powder (to stimulate root growth) comes to mind as something that is used by gardeners when taking cuttings.

This article may be useful if you haven't already seen it....http://www.canna-uk.com/plant_growth_regulators.

AM 

i have to admit I haven't heard of cultar before till you mentioned it although I have heard of a product called cycocell  I have used when I was crop spraying many years ago i believe it  mite be on the banned chemical list now farmers still use a growth regulator but what is called these days I don't know
I know growrh regulators are  used by some commercial growers but when to use it or what strength the apply as a spray

still a very grey area to me and your link  Auntie is a bit technical to me 

We used Cutlass inhibitor on the privet hedges many years ago !
That many years ago i cannot recall if it worked or not !

as I understand  Vic farmers use roundup before harvest on cereal crops  [wheat] to kill of the black grass that is prevalent in most wheat crops this makes harvesting the crop more easy for modern combine harvesters

I've never heard that it makes it weigh more because its damp because corn merchants always test corn for moisture content before its unloaded hence why farmers dry there crop before taking it to the merchant I know this to happen

and its also a fact that the farmer must to notify the relevant agricultural bodies that the crop has been sprayed there is also no evidence that wheat sprayed prior to harvest has  contamination to wheat flour when used for bread making