Clementine  does not come true from seed.

the number of HLB detections in California is quickly approaching 700.   There have been more than 350 detections in Riverside, Los Angeles, and Orange counties this year alone.

Marsh grapefruit is not a cold hardy cultivar.   I remember Dr. Malcolm Manners once wrote on the old forum, that a Marsh grapefruit he picked from a 25 year old tree was the best grapefruit he had ever tasted.  That tree was growing on the collage campus of Florida Southern Collage.

http://www.freshplaza.com/article/198259/An-orange-a-day-keeps-macular-degeneration-away

With my lemons, I juice them and freeze the juice in ice cube trays, then store in the freezer.  My wife uses them when making lemonade, and other recipes.

TFN I see you have some engineering skills

Basically there is not much difference between a grafted Meyer and a rooted cutting.  Meyer lemon cuttings root very easily, therefore the citrus nurseries now sell mostly trees grown from cuttings.  As TFN wrote, you can prune a cutting off your tree and make as many Meyers as you wish.   Enjoy your tree.,

TFN, I was at the Savannah Southeastern Citrus Expo.  In fact I won the prize (a bag of oranges) for coming the longest distance to attend the Expo.

Yes, lower light levels is certainly one of the reasons. Sometimes water sprouts also have very large leaves. Interior leaves of the tree are normally larger then exterior leaves, but then that would be due to lower light levels as Vlad mentioned.

I take it your in Fountain Valley California.  The fruit on your tree should now be in the cell division stage.  This second spray of LBU is to extend the length of the cell division stage, thus producing larger fruit.  As long as their is no blossoms currently on your tree (and at this time of year the flowering period should be well over) then yes it should be completely safe to spray. 

Yorgos,  2 tsp. will not be a problem a all.  Thanks or the heads up.

Summer applications of low biuret urea is designed to increase fruit size. The time of application is important.  The treatment is designed to extend the cell division stage of fruit development to achieve an increase in fruit size. The period of the second application is between approximately June 11 and July26. Low biuret urea is most effective when applied between July 1 and July 26. Applications of low biuret urea that are too early (May & June) as was the first low biuret spray, increase fruit retention and not effective in increasing fruit size. The rate of application for the summer spray is 1/4-lb. of low biuret urea per gallon. Best to spray either early in the morning or later in the evening to reduce evaporation.

I have never cared much for Fallglo, but a cross with Xie Shan might lead to something.