what is atmospheric fixation and how fixation takes place?
Nitrogen fixation is of two types 1  : Non Biological Fixation.  Atmospheric nitrogen fixation (or Natural) by lightning:- It contributes about 10% of the total nitrogen fixation.Usually atmospheric nitrogen fixation (or Natural) by lightning occurs in rainy season during lightning or thunder storms.
Approximately 78% of air is Nitrogen. Nitrogen is important to life because it is a key part of amino and nucleic acids. Also, it is an important part of ATP, which is the basic energy molecule for living things. Neither plants or animals can obtain nitrogen directly from the atmosphere. Instead, they depend on a process known as nitrogen fixation.