Nitrogen fixation is essential to life on Earth because fixed inorganic nitrogen compounds are required for the biosynthesis of all nitrogen-containing organic compounds such as amino acids, polypeptides and proteins, nucleoside triphosphates and nucleic acids.

2024年11月16日 · The most crucial method of nitrogen entry into the soil is through nitrogen fixation, a process that converts atmospheric nitrogen (N₂) into forms that plants can utilize.

2024年12月31日 · Wherever intensive agriculture was practiced, there arose a demand for nitrogen compounds to supplement the natural supply in the soil. At the same time, the increasing quantity of Chile saltpetre used to make gunpowder led to a worldwide search for natural deposits of this nitrogen compound.

2024年10月7日 · Nitrogen-fixing bacteria play a crucial role in enriching soil fertility by converting atmospheric nitrogen into forms that plants can readily absorb. This natural process is vital for sustainable agriculture and ecosystem health, reducing the need for chemical fertilizers.

Plants acquire these forms of “combined” nitrogen by: 1) the addition of ammonia and/or nitrate fertilizer (from the Haber-Bosch process) or manure to soil, 2) the release of these compounds...

2023年2月17日 · Atmospheric nitrogen fixation or only nitrogen fixation is when atmospheric nitrogen (N 2) is converted to ammonia (NH 3). It is carried out primarily by soil microorganisms. Most of the nitrogen fixation occurs naturally in the soil by different nitrogen-fixing bacteria such as Azotobacter, Rhizobium, Azospirillum, and Cyanobacteria.

2024年3月5日 · During ammonification, organic forms of nitrogen are converted into ammonia (NH 4+). Nitrification is the process which converts ammonia or ammonium (NH 4+) into nitrate (NO 3-). This process involves bacteria, which oxidize the reduced forms of nitrogen in ammonia (NH 3) or NH 4+ into a more-oxidized form of nitrogen as NO 3-.

It is easier and less energy consuming for the plant to absorb nitrogen from the soil than to fix it from the air. Perennial and forage legumes, such as alfalfa, sweet clover, true clovers, and vetches, may fix 250–500 lb of nitrogen per acre.

2023年6月22日 · Nitrogen-fixing bacteria in the soil take nitrogen (N) gas and turn it into a usable form for plants. These forms come in several types, but symbiotic nitrogen fixation is the most common.

2016年9月16日 · FARMERS REMOVE NITROGEN from soil whenever they harvest grain or other plant matter; in time, the soil gets depleted and yields shrink. Traditionally, they replaced the missing nitrogen by adding manure or compost, or by planting legumes.