What are the feeding requirements for a Kaffir lime tree that is grown inside?
This article will help you:
https://www.gardeningknowhow.com/edible/fruits/citrus/fertilizing-citrus-trees-best-practices-for-citrus-fertilizing.htm
Fix required for kaffir lime leaf curl. Potted tree in full sun.
Chances are it is not getting consistent watering. Make sure that it does not dry out, containers are prone to drying out faster. This article will help:
https://www.gardeningknowhow.com/edible/fruits/citrus/tip-on-water-requirements-for-citrus-trees.htm
Are Kaffir lime leaves that are used in cooking different from regular lime tree leaves?
Yes. They are primarily used with Thai and other Asian dishes. For more about cooking with Kaffir leaves, try a Google search.
I have a Kaffir lime tree in the backyard of a rental property I've just moved to. It looks like many of its leaves have been eaten by something, but it looks like it has a disease because it has a speckled scale on the leaves and branches. Any ideas of how I can help it get better? New leaves are coming through that look fine.
This is typically a sign of either a scale or aphid infestation, both of which can be hard to spot. I would treat the tree for these pests. I recommend neem oil for this. It is very effective but still organic. Here is more information to help you: https://www.gardeningknowhow.com/plant-problems/pests/scale-bug-how-to-control-plant-scale.htm
https://www.gardeningknowhow.com/plant-problems/pests/homemade-aphid-control-a-natural-way-to-kill-aphids.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
My kaffir lime tree, who lives indoors, started to lose the leaves (the are green). They are also sticky. What can I do? It already lost its one fruit.
Here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/fruits/lime/lime-tree-leaf-drop-why-a-lime-tree-is-losing-leaves.htm
Most likely in your case pests are to blame, which result in the sticky leaves. Neem oil should help with this.
Do you need to fertilize the tree? If so, what would be best to use and how often?
Lime trees, whether in pots or the ground, typically require a nitrogen-rich fertilizer. Here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/fruits/citrus/fertilizing-citrus-trees-best-practices-for-citrus-fertilizing.htm
I have a kafir lime that is planted in a large pot. It has been good and strong for about 3 months but now has dropped all its . Have I done something wrong? The soil is still damp and has not been too wet. Can you shed some light on this for me?
Here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/fruits/lime/lime-tree-leaf-drop-why-a-lime-tree-is-losing-leaves.htm