A tree will obtain these elements from the soil, water, or the atmosphere. Of all of the elements necessary for tree growth, the one nutrient that is most often in short supply is nitrogen (N2).

Although nitrogen is very abundant in the atmosphere, ... Since the mid-1900s, humans have been exerting an ever-increasing impact on the global nitrogen cycle. Human activities, ...

Atmospheric nitrogen must first be fixed, or converted to ammonia (NH3) by certain bacteria. Steps of the Nitrogen Cycle Atmospheric nitrogen (N2) is converted to ammonia (NH3) by nitrogen-fixing ...

There are two stable nitrogen isotopes, nitrogen-14 (99.6% of naturally occurring nitrogen), and nitrogen-15 (0.4% of naturally occurring nitrogen). Nitrogen-15 is a rare stable isotope of nitrogen.

Living organisms need nitrogen as a central building block for protein formation, for example. However, although our atmosphere contains plenty of nitrogen, neither humans nor the vast majority of ...

Most plants cannot use nitrogen gas in the atmosphere for growth. They require it to be converted to usable forms, such as ammonia — a process that forms part of the nitrogen cycle.

Then, a century ago, the nitrogen cycle changed forever when Fritz Haber, a German chemist, invented an industrial process for fixing nitrogen from the atmosphere to make chemical fertiliser.

Matthew writes: “My tattoo is taken from a 1950’s biology textbook. The reason it means so much to me is because of the relevence of the nitrogen cycle to the cycle of life. The horse dies ...

Plants can grow faster as atmospheric carbon dioxide concentrations increase, but only if they have enough nitrogen or partner with fungi that help them get it, according to new research.

Scientists have found fixed forms of nitrogen in Mars. This suggests that there may have been a nitrogen cycle sometime in Mars' past. The detection has been verified through analyses of samples ...