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In my country I don't have fertilizer products, but I know that I can get nitrogen from any greens.
I already knew that I can soak them in water to make liquid fertilizer, but what if I want to make slow release fertilizer? Someone told me just to bury them in the soil. Is that true? Is there a better method to get use of the greens as a fertilizer?
UPDATE: I live in Egypt. I want to grow cherry tomatoes in containers. The green is kind of grass. I don't have space to make compost.
If you have a household, you can generate enough waste to start some Bokashi bins. You can purchase these from Green Zone Egypt. These create compost in buckets but the process needs to be finished off in soil. So when the bucket is full, and left for 10 days, take some of the material out, and put it into the bottom third of your container. Cover with potting mix. And plant on top. If you don't have potting mix you can use peat mixed with sand.
You can add additional fertiliser by using dilute urine, and complement that with wood ash for the potassium. Studies show this to be a complete fertiliser.
If you can get access to the building roof, see if you can start a roof garden.
http://www.egyptindependent.com/news/how-grow-rooftop-garden-and-wring-pollution-s-neck
In my experience, composting in place in a pot does not work well. I would recommend against that option.
Given that you don't have space for a compost pile and will be growing in containers, I think that vermicomposting would be your best option. A worm bin does not need to be large - it can fit in a kitchen cabinet or on a veranda. They're easy to put together and fairly easy to care for (you just need to add your greens and make sure it doesn't dry out. The vermicompost that you get from them really can't be beat. I did a quick search to see whether bins are readily available in Egypt and found this article:
http://www.madamasr.com/sections/environment/small-mighty-earthworms-could-save-egypts-soil
So it seems that while you may not be able to get a commercial bin, there is a good chance you'll be able to find the worms and you can make a bin on your own.
You should start a compost pile. From the linked source, be aware that the type of material you compost does make a difference in how much nitrogen you get in the end. IE:
fruit & vegetable scraps - Nitrogen
leaves - Carbon
grass clippings - Nitrogen
lawn & garden weeds - Nitrogen
shrub prunings - Carbon
