I grow the NZL tree.  I would put the cultivar into the novelty category.  I like the fruit for eating out of hand.  The acid content is quite mild  blended with a sweet taste.  Does taste somewhat like lemonade.  Cannot be used as a lemon due to the fruits low acid content.  Would be good to blend into salads.  Good to eat out of hand, but then one can only eat so much fruit out of hand,  The tree is very productive,

Citradia, at what altitude are you located?

Like lebmung wrote, Sour Orange is a fantastic rootstock, as long as the grower does not live in areas susceptible to tristeza virus.  Sour  Orange has high peel quality, high to very high internal quality, excellent tolerance to Phytophthora, no common incompatibilities except with kumquat & eureka lemon, broad soil adaptation, and as far as it's yield it is generally very similar to that of trees grafted on Carrizo.  One interesting point about trees grated on sour orange rootstock. Where tristeza is wide spread, all trees grafted on sour orange will be likely be killed, EXCEPT LEMONS.

The tree was handled rather hard by the nursery, but still looks to be healthy.  It is flushing out in several locations on the tree.   With your good care it should soon be well on its way.

After two or three weeks please post another picture of this tree, so that we can see the trees improvement.

My Meiwa kumquat has so many fruits there is no way I can ever eat all of them.  I do notice that the Meiwa's peel is loosing some of its sweetness the longer the fruit hangs.

Lebmung, your correct. Thanks for pointing that out.  Poncirus does well in wet conditions and clay soils,  Because trifoliates  do better then most rootstocks in wet/clay soils, they have a hard time with dry conditions. 

See that Brian......Great minds think alike.

I purchased a Shasta Gold mandarin from Logee's greenhouse and planted it on October 18, 2019 in a 3-gallon Root maker air root pruning container.  The tree is planted in a 5-2-1 medium (5-parts Repti-bark wood chips, 2 parts peatmoss 1 part perlite).  This is a highly aerated and rapid draining medium, so I water the tree by soaking the entire container for 1 hour per week (at least at this time of year).  An hours soak allows the Repti bark to absorb up a supply bank of water for extended use by the tree. Soaking the root system for this period of time does no damage to the roots.  A citrus tree can remain submerged for two days before any root damage begins to occur.  In the 5 months since the tree has been planted, it has had one flush and one flowering.  However, the tree dropped all the small fruitlets from this initial bloom.  I expect that the next flowing should be around August.  If at that time some fruit is retain, I will allow the tree to keep one fruit.  Retaining one fruit, even on a young small tree, does not effect the trees potential growth at all.  This is because all the energy a fruit requires to produce and grow to maturity is derived only from the 3 or 4 closest leaves to the fruit, and not from the entire tree (research my Karen E. Koch U. of Florida). For container growing I find the 5-2-1 medium works very well.  An additional 5-2-1 advantage, is one does not need to worry about over watering.  I fertilize the tree with Jack's professional 25-5-15 w/micros fertilizer.   

Almost impossible to pinpoint maturity date for any one tree, or the growing location.  However, in general terms for a pummelo the generally accepted time from seed planting to fruit production is 7 to 10 years. 

Luak, sounds like your doing every think correctly.  As you wrote, your tree will adjust the initial crop load to keep what the it is capable to bring to harvest.  Your summer spray in July will help the tree to hold onto all the fruit, and to increase the fruits size. 

What is considered low biuret urea by the University of California and the University of Florida is urea with a biuret contend of 0.25% biuret.

Time has passed to apply a winter prebloom foliar application of low-biuret urea. The most effective period for summer spray is between July 1 and July 26.  Use summer applications of low biuret urea: (1) If your goal is to increase fruit size, and (2) if your tree is carrying a heavy crop.  Spray either in the early morning or early evening.

All the leaves on my many citrus trees are shining extra brightly today with their pretty green leaves.  It must be Saint Patrick's day.

Happy sSint Patrick's day.