Do Chemicals in Fireworks/Crackers serve as Fertilizers for Plants?

Question

I had a doubt regarding the fireworks....

Do chemical contents of these any Fireworks/Crackers contain Nitrogen/Phosphorus /Potassium(NPK) elements/oxides which may serve Fertilizers for plants?

Is it safe to put firework chemical powder content in Plants soil?

Thanks for answers

-->And finally tell me whether it is useful or harmful to plants?

Answer 1

The part of fireworks that burn is the 'gunpowder' moiety.
Gunpowder is composed of, amongst other chemicals, Carbon and saltpetre ( Potassium Nitrate) & Sulphur. Out of these chemicals the saltpetre (Potassium Nitrate - KNO3) is the most beneficial to a garden as fertiliser, as it contains potassium and nitrogenous material.

Answer 2

Typical firecrackers are made using black gunpowder wrapped in paper, which contains the combustion and creates the noise when it bursts.  Gunpowder is made using potassium nitrate (KNO3), which contains both nitrate and potash.  The only thing it's missing plant-wise is phosphorus.

Gunpowder also contains sulfur (which is another necessary nutrient, though not as important as KNP).  There are other firework formulations which use chlorates and perchlorates (ClO3 and ClO4) with fuels like aluminum; these will not help plants, and perchlorate is toxic to humans.