If you cool nitrogen gas down, it becomes liquid at minus 195 degrees Celsius. This is much colder than, for example, water vapour, or steam, which becomes liquid at plus 100 degrees Celsius, when you cool it down. The temperature at at which a substance becomes liquid when you cool it down, is the temperature at which it boils when you heat it up. So the boiling point of nitrogen is minus 195 degrees Celcius. Neutrons do NOT contain nitrogen.
Neutrons are tiny particles found in the nuclei of atoms.
So although neutrons don't contain nitrogen, nitrogen atoms contain neutrons. Your fingernails are made from proteins. All proteins contain nitrogen. Fertilisers contain nitrogen. Industry converts 70 million tonnes of nitrogen into fertilisers every year .