nitrogen fixers
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Crotalaria juncea , known as sunn or sunn hemp , is a tropical Asian plant of the legume family ( Fabaceae ). Grown as a source of green manure , fodder and the lignified fiber obtained from its stem, it bears yellow flowers and elongate, alternate leaves. [ 1 ] Sunn hemp is also being looked at as a possible bio-fuel. [ 2 ] [ edit ] Description Annual, c. 60–250 cm tall.
Crotalaria juncea
Elaeagnus angustifolia
Elaeagnus angustifolia , commonly called silver berry , [ 1 ] oleaster , [ 1 ] Russian olive , [ 1 ] or wild olive , [ 1 ] is a species of Elaeagnus , native to western and central Asia , from southern Russia and Kazakhstan to Turkey and Iran . It is now also widely established in North America as an introduced species . Elaeagnus angustifolia is a usually thorny shrub or small tree growing to 5–7 m in height. Its stems, buds, and leaves have a dense covering of silvery to rusty scales. The leaves are alternate, lanceolate, 4–9 cm long and 1-2.5 cm broad, with a smooth margin.
(Note: If you click on any of the pictures displayed on this page, you will be shown a larger, higher-quality version of the same image.) Nitrogen Fixation Home Page Part I. The range of organisms that can fix nitrogen Part II.
Part I. (cont.) The legumes that can fix nitrogen
Ceratonia siliqua
Ceratonia siliqua , close-up of female flower. Green and ripe Carob pods. Abaxial and adaxial surfaces of Carob leaflet.
Lupinus
Lupinus , commonly known as lupin or lupine (North America), is a genus of flowering plants in the legume family ( Fabaceae ). The genus comprises about 280 species (Hughes), with major centers of diversity in South and Western North America (Subgen. Platycarpos (Wats.) Kurl.), parts of the Southern Hemisphere (New Zealand and parts of Australia) and the Andes and secondary centers in the Mediterranean region and Africa (Subgen.
Shelterbelt Varieties for Alberta - Silver Buffaloberry
Plant characteristics | Nitrogen fixing | Site Preference | Hardiness | Uses | Problems | Pruning . Scientific Name: Shepherdia argentea (Pursh) Nutt. Plant Characteristics Native to North America, this shrub grows on the prairies from Manitoba to Saskatchewan. Commonly found around sloughs, in coulees, and on light soils on the prairies.
Alnus serrulata
Alnus serrulata , the hazel alder or smooth alder , is a thicket-forming shrub in the family Betulaceae . It is native to eastern North America and can be found found from western Nova Scotia and southern New Brunswick south to Florida and Texas . [ edit ] Description Alnus serrulata leaves (detailed)Alnus rubra , the red alder , is a deciduous broadleaf tree native to western North America . [ edit ] Description Male catkins with tiny female catkins above It is the largest species of alder in North America and one of the largest in the world, reaching heights of 20–35 m. The official tallest red alder (1979) stands 32 meters tall in Clatsop County, Oregon ( USA ).
Alnus rubra
Nitrogen fixers
Nitrogen-fixing Bacteria Certain bacteria are capable of fixing nitrogen. In this process, nitrogen gas (N 2 ) is converted to ammonium (NH 4 + ), a form of nitrogen that is biologically available to plants. The reaction is catalyzed by the enzyme nitrogenase. Because nitrogenase is inactivated by oxygen, the reaction must occur in a low oxygen environment. Species capable of fixing atmospheric nitrogen generally belong to one of the following phyla of bacteria:
Alder is the common name of a genus of flowering plants ( Alnus ) belonging to the birch family Betulaceae . The genus comprises about 30 species of monoecious trees and shrubs , a few reaching a large size, distributed throughout the north temperate zone . [ edit ] Etymology
Alder
How do other plants, which do not have this ability or "partner," benefit from this nitrogen fixation? First, not much nitrogen leaks out of the roots of the nitrogen-fixing plant, in that most of the nitrogen is utilized by the plant and its "partner". The way that other plants benefit is that when leaves from the nitrogen-fixing plant fall off onto the ground, then other bacteria, that live in the soil, convert those leaves, into humus. During this process, the nitrogen in the leaves (mostly in the form of proteins) is changed back into nitrate in the soil, which nearby plants can pick up and use.