Leaves turning yellow and spots on them.

Hello

I got my first Bonsai tree on the 23'rd of july.I've been giving wate and i just got a "Fertilizer" (N-P-K 1-1-3).On the bottle it said "take one capfull and mix it with 2L of water.Heres my question,do i pour the entire 2L on the bonsai?

Now,leaves.A few days ago some of the leaves started having spots on them and some of them turned light green,yesterday i even noticed that two leavs turned yellow and could be EASILY Removed.Pictures below

https://2img.net/h/i226.photobucket.com/albums/dd12/demon4777/IMG20110811_002.jpg

https://2img.net/h/i226.photobucket.com/albums/dd12/demon4777/IMG20110811_001.jpg

https://2img.net/h/i226.photobucket.com/albums/dd12/demon4777/IMG20110811_003.jpg

Is this normal?

Looks like a Chinese Elm. You are keeping it indoors and giving it too much water.
Try to get the tree outside as weather permits. (This time of year you should be able to keep it out 24/7.
Check the soil daily but water only when dry.
The fertilizer mix can be used instead of a watering. Use what you need.
Don't keep a water tray under the plant except to catch water than runs out.
Being too wet kills more Bonsai than anything else.

Your second picture shows typical symptoms of chlorosis, which is a lack of certain micronutrients. As Billy says, too much water around the roots can cause it, too.

The fertilizer you are using sounds as if it might be fish emulsion or some other organic mixture. These normally do not contain the needed micronutrients. If you can find a balanced houseplant fertilizer (these usually come in crystalized powders which you dissolve in water and have a more balanced NPK ratio like -- for instance -- 10-15-17 {the exact numbers are unimportant}) it likely will have some of the micronutrients (iron, magnesium, manganese, etc.) That would be a better fertilizer. I have no idea which brands or kinds of fertilizers may be available in Estonia.

For chlorosis, you may need to find some chelated iron and/or epsom salts to clear it up.

The yellow leaf in the first photo is normal. Elms tend to lose individual leaves through the growing season for no clear reason.

Good luck. Hope this helps.