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.