The tree is very short, like 5' and I want to keep it that way so that I can easily pick the fruits without a ladder. That's why I only want the lower branches to grow back.

I'm not sure what type it is, perhaps you can identify from the fruits.

Is there any fertilizers that would increase more branches. Maybe a fruiting fertilizer like citrus fertilizers may help create more shoots?

If you are in the southern hemisphere you can feed with a 3-1-2 ratio fertilizer. Then add a high nitrogen fertilizer to get to a 5-1-2 ratio. If you are north you will have to wait till next year.

Steve,

You must have been absent the day they taught math. 5-1-3 is a lower nitrogen level than 3-1-2. The general rule for citrus is 5-1-3; but we feed our Meyers 3-1-2 (actually 18-6-12) because they are such prolific bearers. Anyway, IMHO the op's tree looks like a Meyer; especially in the before photo.

Math lesson 5 is bigger than 3

John I hit the wrong key on my keyboard when that 3 came up and I didn't catch it before i posted it. I will correct it.

Steve,

What I meant to say is that 3-1-2 is a higher nitrogen ratio compared to the P and K. The empirical amount of nitrogen is just a matter of strength and/or volume. What I know for sure is that if you give a Meyer too much nitrogen during bloom, it will drop the flowers and make more leaves.

I'm confused as to how 3/6 (50% of total) nitrogen is a higher relative ratio of nitrogen than 5/9 (more than 50% of total)?

It's not. He's wrong.

5-1-3

5% nitrogen

1% phosphorus

3% potassium

91% water or filler or both (including micronutrients)

So 3-1-2 is 3% nitrogen, 1% phosphorus and 2% potassium? That would be less nitrogen then. If the reasoning is give Meyers 'more' nitrogen then the 5-1-2 is the right one.

My in ground trees are in soil inundated with phosphorus. so i have 24-8-16 Miracle grow in which I added 8-0-4 at a quantity to get a 48-8-28 mix and used that mix on my in ground tangerine trees at 1/2 strength. I also add 28-0-4 to a 24-8-16 for my citrus trees sharing root space with vegetable plants. The available light to the veggies is the limiting growth factor and much of the nitrogen goes to the citrus trees. I may be in error with the plants sharing the soil with citrus. I cannot tell yet

Yeah it's npk nitrogen phosphorus potassium. Honestly calcium is a macronutrient not a micronutrient but the npk thing was established before they realized that.

also some plants are calcifuges meaning they don't like calcium. Like blueberries. Although they actually do like calcium they just don't like the high ph calcium brings. Confused yet? Lol

Oh ok, my understanding of blueberries is that they do not have the ability to regulate their calcium intake at higher pH like some plants which is why they need low pH, at least one of the reasons, and I was reading that sulfur is needed by plants almost as much as phosphorus in some instances so yea there are some not listed in NPK that are needed in greater amounts than micros.

Yes, it's key to know what your growing.