Ultimate size of a grafted Sapote tree.
 

I found the answer:

Rootstocks are more for soil and climate adaptation, pest and disease
resistance,
precocity, tree logetivity and ease of propagation and less for
controlling the
scion size.

A tree size is controlled by pruning, irrigation and fertilization

How-Hie Ling wrote:

Hi,

Ungrafted Green Sapote is almost twice as high as Mamey Sapote.

1. When a Green Sapote scion is grafted onto a Mamey Sapote root stock

and it grows
into a mature tree, will the ultimate height and size be the same as
Green Sapote or Mamey Sapote or comination of both?

2. What happen if the Mamey Sapote root stock also has a shoot growing

up with the Green Sapote, what is the ultimate height and size?

How-Hie Ling