What nitrogenous can convert atmospheric nitrogen to ammonia and role of lightning in the nitrogen cycle?
I am not sure what you mean by "nitrogenous" in the context of the question, but generally, molecular nitrogen (i.e. N2) can be converted to biotic nitrogen by "nitrogen fixation", a biological process done by many bacteria.
Alternatively, nitrogen can be physio-chemicaly converted to NH3 in the Haber-Bosch process - under high temperatures and pressure.
Bacteria that convert atmospheric nitrogen into nitrogen compounds like ammonia are called nitrogen-fixing bacteria. These bacteria make nitrogen available for the plants. These are of 2 types, symbiotic nitrogen-fixing bacteria like Rhizobium and non-symbiotic nitrogen-fixing bacteria like Azotobacter. Nitrogen-fixing bacteria in the soil and within the root nodules of some plants convert nitrogen gas in the atmosphere to ammonia. Through lightning: Lightning converts atmospheric nitrogen into ammonia and nitrate (NO3) that enter soil with rainfall. Industrially: People have learned how to convert nitrogen gas to ammonia (NH3-) and nitrogen-rich fertilizers to supplement the amount of nitrogen fixed naturally. Therefore, the process of conversion of free atmospheric nitrogen into usable compounds is called nitrogen fixation. A noteworthy and very important feature of Azotobacter and Nitrobacter are their ability to "fix" atmospheric nitrogen, by the conversion of this elemental form to ammonia. Plants are able to utilize ammonia as a nutrient which is very significant for the plant's growth and development.The high temperature of a lightning bolt can break the bonds of atmospheric nitrogen molecules. Free nitrogen atoms in the air bond with oxygen in the air to create nitrogen oxides, which dissolve in moisture to form nitrates that are carried to Earth's surface by precipitation. Lightning accounts for some naturally occurring reactive nitrogen—worldwide each year, lightning fixes an estimated 3–10 teragrams (Tg), the usual measurement unit for discussing the global nitrogen cycle. When lightning passes through the atmosphere, the huge quantities of energy can cause nitrogen molecules to react with oxygen forming nitrogen oxides. These dissolve in rain, and are carried to the ground. In the Haber process, nitrogen and hydrogen gases react together to produce ammonia (NH3).
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