Alfalfa 66159 223228549 2008-07-03T04:02:46Z 68.147.67.250 {{two other uses||the [[Our Gang]] ([[Little Rascals]]) character|Carl Switzer|the County in Oklahoma|Alfalfa County, Oklahoma}} {{Taxobox | name = Alfalfa | image = Lucerne flowers.jpg | image_width = 240px | image_caption = ''Medicago sativa'' | regnum = [[Plant]]ae | divisio = [[Flowering plant|Magnoliophyta]] | classis = [[Magnoliopsida]] | ordo = [[Fabales]] | familia = [[Fabaceae]] | subfamilia = [[Faboideae]] | tribus = [[Trifolieae]] | genus = ''[[Medicago]]'' | species = '''''M. sativa''''' | binomial = ''Medicago sativa'' | binomial_authority = [[Carolus Linnaeus|L.]]<ref> {{cite web |url=http://www.ildis.org/LegumeWeb?sciname=Medicago+sativa |title=Medicago sativa - ILDIS LegumeWeb |publisher=www.ildis.org |accessdate=2008-03-07 |last= |first= }} </ref> | subdivision_ranks = Subspecies | subdivision = ''Medicago sativa'' subsp. ''ambigua''<small> ([[Trautv.]]) [[Tutin]]</small><br/> ''Medicago sativa'' subsp. ''microcarpa''<small> Urban</small><br/> ''Medicago sativa'' subsp. ''sativa''<small> [[Carolus Linnaeus|L.]]</small><br/> ''Medicago sativa'' subsp. ''varia''<small> (T. Martyn) Arcang.</small><br/> }} '''Alfalfa''' (''Medicago sativa'') is a flowering plant in the pea family Fabaceae cultivated as an important forage crop. In the [[United Kingdom|UK]] it is known as lucerne and Lucerne grass in India. Alfalfa is a cool season perennial [[legume]] living from three to twelve years, depending on variety and [[climate]]. It resembles [[clover]] with clusters of small purple [[flower]]s. The plant grows to a height of up to {{convert|1|m|ft|0}}, and has a deep [[root]] system sometimes stretching to {{convert|4.5|m|ft|0|lk=on}}. This makes it very resilient, especially to droughts. It has a [[tetraploid]] [[genome]]. The plant exhibits [[autotoxicity]], which means that it is difficult for alfalfa seed to grow in existing stands of alfalfa. Therefore, it is recommended that alfalfa fields be [[crop rotation|rotated]] with other species (e.g. corn, wheat) before reseeding. Like other legumes, its root nodules contain bacteria, ''[[Sinorhizobium meliloti]]'', with the ability to [[nitrogen fixation|fix nitrogen]], producing a high-protein feed regardless of available nitrogen in the [[soil]]. Its nitrogen-fixing abilities (which increases soil nitrogen) and use as animal feed greatly improved agricultural efficiency. (The nitrogen comes from the air, which is 78 percent molecular [[nitrogen]].) Alfalfa is widely grown throughout the world as forage for [[cattle]], and is most often harvested as [[hay]], but can also be made into [[silage]], grazed, or fed as greenchop. Alfalfa has the highest feeding value of all common hay crops, being used less frequently as [[pasture]]. When grown on soils where it is well-adapted, alfalfa is the highest yielding forage plant. Alfalfa is one of the most important [[legumes]] used in agriculture. The US is the largest alfalfa producer in the world, but considerable area is found in Argentina (primarily grazed), Australia, South Africa, and the Middle East. Known as Kuthirai Masal in Tamil, alfalfa is mostly grown in the Coimbatore district of [[Tamil Nadu]], southern India. The leading alfalfa growing states (within the [[United States|U.S.A.]]) are [[California]], [[South Dakota]], and [[Wisconsin]]. The upper Midwestern states account for about 50% of US production, the Northeastern states 10%, the Western states 40% and the Southeastern states almost none. Alfalfa has a wide range of adaptation and can be grown from very cold northern plains to high mountain valleys, from rich temperate agricultural regions to Mediterranean climates and searing hot deserts. Its primary use is as feed for dairy cattle, and secondarily for beef cattle, horses, sheep, and goats. Humans also eat alfalfa [[sprouting|sprouts]], in salads and sandwiches, for example. Tender [[shoot]]s are eaten in some places as a [[leaf vegetable]]. Human consumption of fresh mature plant parts is rare and limited primarily by alfalfa's high fiber content. Dehydrated alfalfa leaf is commercially available as a [[dietary supplement]] in several forms, such as tablets, powders and tea. Alfalfa is believed by some to be a [[galactagogue]], a substance that induces [[lactation]]. == Culture == Alfalfa can be sown in spring or fall, and does best on well-drained soils with a neutral [[pH]] of 6.8 &ndash; 7.5. Alfalfa requires a great deal of [[potassium]]. Alfalfa is moderately sensitive to salt levels in both the soil and irrigation water, although it continues to be grown in the arid southwest, where salinity is an emerging issue. Soils low in fertility should be fertilized with [[manure]] or a chemical fertilizer, but correction of pH is particularly important. Usually a seeding rate of 13 – 20 kg/hectare (12 – 25 lb/acre) is recommended, with differences based upon region, soil type, and seeding method. A [[nurse crop]] is sometimes used, particularly for spring plantings, to reduce weed problems. [[Herbicide]]s are sometimes used instead, particularly in Western production. In most climates, alfalfa is cut three to four times a year but is harvested up to 12 times per year in Arizona and Southern California. Total yields are typically around 8 tonnes per hectare (4 short tons per acre) but yields have been recorded up to 20 t/ha (16 short tons per acre). Yields vary with region, weather, and the crop's stage of maturity when cut. Later cuttings improve yield but reduce nutritional content. [[Image:Megachile 1084.JPG|thumbnail|240px|right|[[Alfalfa leafcutter bee]], ''Megachile rotundata'', a [[pollinator]] on alfalfa flower]] Alfalfa is considered an 'insectary' due to the large number of insects it attracts. Some pests such as Alfalfa weevil, aphids, armyworms, and the potato [[leafhopper]] can reduce alfalfa yields dramatically, particularly with the second cutting when weather is warmest. Chemical controls are sometimes used to prevent this. Alfalfa is also susceptible to root rots including phytophora, rhizoctonia, and [[Texas Root Rot]]. Alfalfa seed production requires the presence of [[pollinator]]s when the fields of alfalfa are in bloom. Alfalfa [[pollination]] is somewhat problematic, however, because the pollen-carrying [[keel (disambiguation)|keel]] of the [[flower]] trips and strikes pollinating bees on the head to help transfer the [[pollen]] to the foraging [[bee]]. [[Western honey bee]]s do not like being struck in the head repeatedly and learn to defeat this action by [[nectar robbing|drawing]] [[nectar (plant)|nectar]] from the side of the flower. The bees thus collect the nectar but carry no pollen and so do not pollenate the next flower they visit.<ref name=scinews>{{cite journal | first = Susan | last = Milius | year = 2007 | month = [[January 6]] | title = Most Bees Live Alone: No hives, no honey, but maybe help for crops | journal = [[Science News]] | volume = 171 | issue = 1 | pages = 11–3 | accessdate = 2007-01-15}}</ref> Because older, experienced bees don't pollinate alfalfa well, most pollination is accomplished by young bees that have not yet learned the trick of robbing the flower without tripping the head-knocking keel. When western honey bees are used to pollinate alfalfa, the beekeeper [[Saturation pollination|stocks the field at a very high rate]] to maximize the number of young bees. Today the [[alfalfa leafcutter bee]] is increasingly used to circumvent this problem. As a solitary but gregarious bee species, it does not build colonies or store honey, but is a very efficient pollinator of alfalfa flowers. Nesting is in individual tunnels in wooden or plastic material, supplied by the alfalfa seed growers.<ref name=scinews/> The leafcutter bees are used in the Pacific Northwest, while western honeybees dominate in California alfalfa seed production. A smaller amount of alfalfa produced for seed is pollinated by the [[alkali bee]], mostly in the northwestern USA. It is cultured in special beds near the fields. These bees also have their own problems. They are not portable like honey bees; and when fields are planted in new areas, the bees take several seasons to build up.<ref name=scinews/> Honey bees are still trucked to many of the fields at bloom time. {{Main|List of alfalfa diseases}} == Harvesting == [[Image:Alfalfa round bales.jpg|thumbnail|240px|right|Cylindrical bales of alfalfa]] When alfalfa is to be used as [[hay]], it is usually cut and [[bale]]d. Loose haystacks are still used in some areas, but bales are easier to transport and store. Ideally, the hay is cut just as the field is beginning to flower. When using farm equipment rather than hand-harvesting, a [[swather]] cuts the alfalfa and arranges it in [[windrow]]s. In areas where the alfalfa does not immediately dry out on its own, a machine know as a mower-conditioner is used to cut the hay. The mower-conditioner has a set of rollers or flails that crimp and break the stems as they pass through the mower, making the alfalfa dry faster. After the alfalfa has dried, a [[tractor]] pulling a [[baler]] collects the hay into bales. There are several types of bales commonly used for alfalfa. For small animals and individual horses, the alfalfa is baled into small "square" bales — actually rectangular, and typically about 40 x 45 x 100 cm (14 in x 18 in x 38 in). Small square bales weigh from 25 – 30 kg (50 – 70 pounds) depending on moisture, and can be easily hand separated into "flakes". Cattle ranches use large round bales, typically 1.4 to 1.8 m (4 to 6 feet) in diameter and weighing from 500 to 1,000 kg, (1000 to 2000 lbs). These bales can be placed in stable stacks or in large feeders for herds of [[horse]]s, or unrolled on the ground for large herds of [[cattle]]. The bales can be loaded and stacked with a [[tractor]] using a spike, known as a bale spear, that pierces the center of the bale. Or they can be handled with a grapple (claw) on the [[tractor]]'s [[front-end loader]]. A more recent innovation is large "square" bales, roughly the same proportions as the small squares, but much larger. The bale size was set so that stacks would fit perfectly on a large flatbed truck. These are more common in western states. When used as feed for dairy cattle alfalfa is often made into [[haylage]] by a process known as [[ensilage|ensiling]]. Rather than drying it to make dry hay, the alfalfa is chopped finely and fermented in [[silos]], trenches, or bags, anywhere where the oxygen supply can be limited to promote fermentation (food)|ferment]]. Fermenting the alfalfa allows it to retain high nutrient levels similar to those of fresh forage, and is also more palatable to dairy cattle than dry hay. == Varieties == [[Image:Alfalfa square bales.jpg|thumbnail|240px|right|Small square bales of alfalfa]] Considerable research and development has been done with this important plant. Older [[cultivars]] such as 'Vernal' have been the standard for years, but many better public and private varieties are now available and better adapted to particular climates. Private companies release many new varieties each year in the US. Most varieties go dormant in the fall, with reduced growth in response to low temperatures and shorter days. 'Non-dormant' varieties that grow through the winter are planted in long-seasoned environments such as Mexico, Arizona, and Southern California, whereas 'dormant' varieties are planted in the Upper Midwest, Canada, and the Northeast. 'Non-dormant' varieties can be higher yielding, but they are susceptible to winter-kill in cold climates and have poorer persistence. Most alfalfa cultivars contain genetic material from Sickle Medick (''[[Medicago falcata|M. falcata]]''), a wild variety of alfalfa that naturally hybridizes with ''M. sativa'' to produce '''Sand Lucerne''' (''M. sativa'' ssp. ''varia''). This species may bear either the purple flowers of alfalfa or the yellow of sickle medick, and is so called for its ready growth in sandy soil. Most of the improvements in alfalfa over the last decades have consisted of better disease resistance on poorly drained soils in wet years, better ability to overwinter in cold climates, and the production of more leaves. Multileaf alfalfa varieties have more than three leaflets per leaf, giving them greater nutritional content by weight because there is more leafy matter for the same amount of stem. Modern alfalfa varieties have probably a wider range of insect, disease, and nematode resistance than many other agricultural species. The North American Alfalfa Improvement Conference records new varieties and encourages communication between breeders. [[Roundup Ready]] alfalfa is a [[genetically modified]] variety, patented by [[Monsanto]], that is resistant to Monsanto's [[glyphosate]] herbicide [[Roundup]]. Although most broadleaf plants, including ordinary alfalfa, are sensitive to Roundup, growers can spray fields of Roundup Ready alfalfa with Roundup, and so kill the weeds without harming the alfalfa crop. Roundup Ready alfalfa was sold in the United States from 2005-2007 and more than {{convert|300000|acre|km2}} were planted with it, out of {{convert|21000000|acre|km2}}. However, in May 2007, the California Northern District Court issued an injunction order prohibiting farmers from planting Roundup Ready alfalfa until the US Department of Agriculture (USDA) completed a study on the genetically engineered crop's likely environmental impact. In response, the USDA put a hold on any further planting of Roundup Ready alfalfa. The key issues of the lawsuit were the possibility that Roundup Resistance could be transmitted to other plants, including both other crops and weeds, making major pest species resistant to an important herbicide, Roundup. ==Phytoestrogens in alfalfa== Alfalfa, like other leguminous crops, is a known source of phytoestrogens.<ref>[[Phytoestrogen]] content and estrogenic effect of legume fodder. PMID 7892287</ref> Grazing on alfalfa has been suspected as a cause of reduced [[fertility]] in sheep. ==Medical Uses== Alfalfa has been used as an [[herbal medicine]] for over 1,500 [[year]]s. Alfalfa is high in [[protein]], [[calcium]], plus other [[mineral]]s, [[vitamin A]], [[Vitamin B|vitamins in the B group]], [[vitamin C]], [[vitamin D]], [[vitamin E]], and [[vitamin K]]. ===Traditional Uses=== In early [[China|Chinese]] [[medicine]]s, physicians used young alfalfa leaves to treat [[disorder]]s related to the [[digestive tract]] and the [[kidney]]s. In [[India]], ayurvedic physicians used the leaves for treating poor [[digestion]]. They made a cooling [[poultice]] from the [[seed]]s for [[boil]]s. At the time, alfalfa was also believed to be helpful towards people suffering from [[arthritis]] and [[water retention]]. ===Modern Use=== It is majorly used in homeopathic medicines worldwide. Today, alfalfa is suggested for treating [[anemia]], [[diabetes]], to extend [[appetite]] and contribute towards [[weight]] gain, as a [[diuretic]] for increased [[urination]], for [[indigestion]] and [[bladder]] [[disorders]], alfalfa can also be used as an [[estrogen]] replacement in order to increase [[breast milk]] and to mitigate [[premenstrual syndrome]], a [[dietary supplement]], and to lower blood cholestrol levels.<ref>{{Cite|title=Desk Reference to Nature's Medicine|author=Foster, Steven & Johnson, Rebecca L|publisher=National Geographic|date=2006}}</ref> ==Use in Organic Gardening== Alfalfa is commonly used as plant fertilizer in the form of granular pellets. Alfalfa is also used to make [[Alfalfa tea]], which contains [[Triacontanol]], a plant growth stimulant. ==Literary references== * In ''[[Of Mice and Men]]'', the popular [[novella]] authored by [[John Steinbeck]], Lenny becomes increasingly obsessed with growing Alfalfa for his rabbits for if he ever gets a farm with George. * In [[Catch-22]] by [[Joseph Heller]], [[Major Major Major Major]]'s father receives a government subsidy for every strip of ground he does not grow alfalfa on. He uses this money to buy more land to not grow alfalfa on. ==References == <div class="references-small"> * [http://www.fao.org/ag/AGP/AGPC/doc/Gbase/DATA/Pf000346.htm Grassland Species profile] <references/> </div> ==External links== {{wiktionary}} {{commons|Medicago sativa}} {{wikispecies|Medicago sativa}} * [http://www.ellendick.com/wildbees/ Photos of moving honeybees to alfalfa] * [http://www.pollination.com/publications/IPSpub01.cfm Use of the Alfalfa Leafcutter Bee Growing in California] * [http://www.centerforfoodsafety.org/pubs/Alfalfa_WORC_Factsheet.pdf Problems with genetically modified Alfalfa] * [http://www.uwex.edu/ces/forage/ University of Wisconsin Forage Research and Extension] * [http://alfalfa.ucdavis.edu/ University of California Alfalfa Workgroup] * [http://www.ildis.org/LegumeWeb/6.00/taxa/5808.shtml International Legume Database & Information Services] [[Category:Faboideae]] [[Category:Forages]] [[Category:Medicinal plants]] [[Category:Vegetables]] [[Category:Arabic words and phrases]] [[Category:Pollination management]] [[ar:برسيم حجازي]] [[an:Alfalz]] [[ca:Alfals]] [[de:Luzerne]] [[es:Medicago sativa]] [[eo:Luzerno]] [[fa:یونجه]] [[fr:Luzerne cultivée]] [[ko:개자리속]] [[hsb:Módra šlinčina]] [[is:Refasmári]] [[it:Medicago sativa]] [[ka:იონჯა]] [[la:Medica]] [[nl:Luzerne]] [[ja:アルファルファ]] [[no:Lusern]] [[pl:Lucerna siewna]] [[pt:Alfafa]] [[fi:Sinimailanen]] [[sv:Blålusern]] [[vi:Cỏ linh lăng]] [[tr:Yonca]] [[uk:Люцерна]] [[wa:Luzere]]