Panicum miliaceumis a grain crop with manycommon names,includingproso millet,broomcorn millet,common millet,hog millet,Kashfi millet,red millet,andwhite millet.[2]Archaeobotanicalevidence suggests millet was first domesticated about10,000 BPin Northern China.[3]Major cultivated areas includeNorthern China,Himachal Pradeshof India,[4]Nepal,Russia,Ukraine,Belarus,theMiddle East,Turkey,Romania,and theGreat Plainsstates of the United States.[5]About 500,000 acres (200,000 hectares) are grown each year.[6][better source needed]The crop is notable both for its extremely short lifecycle, with some varieties producing grain only 60 days after planting,[7]and its low water requirements, producing grain more efficiently per unit of moisture than any other grain species tested.[7][8]The name "proso millet" comes from the pan-Slavic general and generic name for millet (Serbo-Croatian:proso/просо,Czech:proso,Polish:proso,Russian:просо).
Proso millet | |
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Proso millet panicles | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Monocots |
Clade: | Commelinids |
Order: | Poales |
Family: | Poaceae |
Subfamily: | Panicoideae |
Genus: | Panicum |
Species: | P. miliaceum
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Binomial name | |
Panicum miliaceum | |
Synonyms[1] | |
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Proso millet is a relative offoxtail millet,pearl millet,maize,andsorghumwithin the grass subfamilyPanicoideae.While all of these crops useC4 photosynthesis,the others all employ the NADP-ME as their primary carbon shuttle pathway, while the primary C4 carbon shuttle in proso millet is the NAD-ME pathway.
Evolutionary history
editPanicum miliaceumis atetraploidspecies with a base chromosome number of 18, twice the base chromosome number ofdiploidspecies within its genusPanicum.[9]The species appears to be anallotetraploidresulting from a wide hybrid between two different diploid ancestors.[10]One of the two subgenomes within proso millet appears to have come from eitherP. capillareor a close relative of that species. The second subgenome does not show close homology to any known diploidPanicumspecies, but some unknown diploid ancestor apparently also contributed a copy of its genome to a separateallotetraploidspeciesP. repens(torpedo grass).[10]The two subgenomes within proso millet are estimated to have diverged 5.6 million years ago.[11]However, the species has experienced only limited amounts of fractionation and copies of most genes are still retained on both subgenomes.[11]A sequenced version of the proso millet genome, estimated to be around 920megabasepairs in size, was published in 2019.[11]
Domestication and history of cultivation
editWeedy forms of proso millet are found throughout central Asia, covering a widespread area from theCaspian Seaeast toXin gian gandMongolia.These may represent the wild progenitor of proso millet or feral escapes from domesticated production.[13]: 83 Indeed, in the United States, weedy proso millet, representing feral escapes from cultivation, are now common, suggesting current proso millet cultivars retain the potential to revert, similar to the pattern seen for weedy rice.[citation needed]Currently, the earliest archeological evidence for domesticated proso millet comes from the Cishan site in semiarid north east China around 8,000 BCE.[3]Because early varieties of proso millet had such a short lifecycle, as little as 45 days from planting to harvest, they are thought to have made it possible for seminomadic tribes to first adopt agriculture, forming a bridge between hunter-gatherer-focused lifestyles and early agricultural civilizations.[14]Archaeological charred grains of common millet were found in several Neolithic sites in Europe and Transcaucasia butradiocarbondates obtained thanks toAMSmethod directly from the grains, indicated that it appeared in that area in the 2nd millennium BC.[15][16][17]
Cultivation
editProso millet is a relatively low-demanding crop, and diseases are not known; consequently, it is often used in organic farming systems in Europe. In the United States, it is often used as an intercrop. Thus, proso millet can help to avoid a summer fallow, and continuous crop rotation can be achieved. Its superficial root system and its resistance to atrazine residue make proso millet a good intercrop between two water- andpesticide-demanding crops. The stubbles of the last crop, by allowing more heat into the soil, result in a faster and earlier millet growth. While millet occupies the ground, because of its superficial root system, the soil can replenish its water content for the next crop. Later crops, for example, a winter wheat, can in turn benefit from the millet stubble, which act as snow accumulators.[18]P. miliaceumis commonly classified into fiveraces,miliaceum,patentissimum,contractum,compactum,andovatum.[19]
Climate and soil requirements
editDue to its C4 photosynthetic system, proso millet is thermophilic likemaize,so shady locations of the field should be avoided. It is sensitive to temperatures lower than 10 to 13 °C (50 to 55 °F). Proso millet is highly drought-resistant, which makes it of interest to regions with low water availability and longer periods without rain.[20][21]The soil should be light or medium-heavy. Due to its flat root systems, soil compaction must be avoided. Furthermore, proso millet does not tolerate soil wetness caused by dammed-up water.[21]
A 2019 study found differentcultivarshave significantly different effects onrhizosphereassemblage, and also thatProteobacteria,Bacteroidetes,Chloroflexi,Gemmatimonadetes,Firmicutes,Verrucomicrobia,andPlanctomycetesare the most common members, in declining order.[22][23]
Seedbed and sowing
editThe seedbed should be finely crumbled as forsugar beetandrapeseed.[20]In Europe, proso millet is sowed between mid-April and the end of May. About 500 grams per acre (44 oz/ha) of seeds are required, which is roughly 500 per square metre (2,000,000/acre). Inorganic farming,this amount should be increased if aharrowweeder is used. For sowing, the usual sowing machines can be used similarly to how they are used for other crops such as wheat. A distance between the rows of 16 to 25 centimetres (6.3 to 9.8 in) is recommended if the farmer uses an interrowcultivator.The sowing depth should be 1.5 to 2 centimetres (0.59 to 0.79 in) in optimal soil or 3 to 4 centimetres (1.2 to 1.6 in) in dry soil. Rolling of the ground after sowing is helpful for further cultivation.[20]Cultivation inno-till farmingsystems is also possible and often practiced in the United States. Sowing then can be done two weeks later.[18]
Field management
editOnly a few diseases and pests are known to attack proso millet, but they are not economically important. Weeds are a bigger problem. The critical phase is in juvenile development. The formation of the grains happens in the 3- to 5-leaf stage. After that, all nutrients should be available for the millet, so preventing the growth of weeds is necessary. Inconventional farming,herbicidesmay be used. Inorganic farming,harrow weeder or interrowcultivatoruse is possible, but special sowing parameters are needed.[20] For good crop development,fertilizationwith 50 to 75 kilograms (110 to 165 lb) nitrogen per hectare is recommended.[21]Planting proso millet in acrop rotationaftermaizeshould be avoided due to its same weed spectrum. Because proso millet is an undemanding crop, it may be used at the end of therotation.[20]
Harvesting and postharvest treatments
editHarvest time is at the end of August until mid-September. Determining the best harvest date is not easy because all the grains do not ripen simultaneously. The grains on the top of thepanicleripen first, while the grains in the lower parts need more time, making compromise and harvest necessary to optimize yield.[20]Harvesting can be done with a conventionalcombine harvesterwith the moisture content of the grains around 15-20%. Usually, proso millet is mowed intowindrowsfirst, since the plants are not dry likewheat.There, they can wither, which makes thethreshingeasier. Then the harvest is done with a pickup attached to a combine.[20] Possible yields are between 2.5 and 4.5 tonnes per hectare (1.00 and 1.79 long ton/acre; 1.1 and 2.0 short ton/acre) under optimal conditions. Studies in Germany showed that even higher yields can be attained.[20]
Geographical distribution
editIn the United States, as of 2015, the total cultivated area of proso millet was 204,366 hectares (505,000 acres), mostly in theGreat Plainsstates.[5]The top three producers in 2015 were Colorado, Nebraska, and South Dakota, with 109,265 hectares (270,000 acres), 42,492 hectares (105,000 acres), and 28,328 hectares (70,000 acres).[5]Historically grown as animal and bird seed, as of 2020, it has found a market as an organic gluten-free grain.[24]
Proso millet is one of the few types of millet not cultivated in Africa.[25]
As food and drink
editHumans
editIn Inner Mongolia and northwestern Shanxi, China, fermented proso millet porridge known as "suan zhou" ( toan cháo ) is popular. Millet is soaked to allow fermentation, then water is emptied to obtain porridge. The emptied water is served as a millet drink called "suan mi tang" ( toan nước cơm ). The porridge is eaten alongsidepickles,e.g. turnips, carrots, radish and celery. The porridge may be stirred-fried and is called "chao suan zhou" ( xào toan cháo ). The porridge may also be steamed into solids known as "suan lao fan" ( toan vớt cơm ). While the traditional grain is proso millet, it is mixed with rice when available. Many folk idioms of sourness derive from this dish.[26][27]
In the United States, proso millet is used to brewgluten-free beer,being mixed with other grains to produce a texture.[28][29]
Livestock and poultry
editProso millet is primarily grown as livestock and poultryfodder.As food it is very deficient inlysineand needs complementation. Proso millet is also a poor fodder due to its low leaf-to-stem ratio and a possible irritant effect due to its hairy stem. Foxtail millet, having a higher leaf-to-stem ratio and less hairy stems, is preferred as fodder, particularly the variety called moha, which is a high-quality fodder.
Nutrition
editNutritional value per 100 g (3.5 oz) | |||||||||||||||||||||||||||||||||||||||||||||
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Energy | 1,597 kJ (382 kcal) | ||||||||||||||||||||||||||||||||||||||||||||
75.1 g | |||||||||||||||||||||||||||||||||||||||||||||
Dietary fiber | 3.5 g | ||||||||||||||||||||||||||||||||||||||||||||
4.2 g | |||||||||||||||||||||||||||||||||||||||||||||
10.8 g | |||||||||||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||||||||||
Other constituents | Quantity | ||||||||||||||||||||||||||||||||||||||||||||
Water | 8.7 g | ||||||||||||||||||||||||||||||||||||||||||||
†Percentages estimated usingUS recommendationsfor adults,[30]except for potassium, which is estimated based on expert recommendation fromthe National Academies.[31] |
Millet flour is 9% water, 75%carbohydrates,11%protein,and 4%fat(table). In a reference amount of 100 grams (3.5 oz), millet flour supplies 382calories,and is a rich source (20% or more of theDaily Value,DV) of severalB vitaminsanddietary minerals(table).
The demand for more diverse and healthier cereal-based foods is increasing, particularly in affluent countries.[32]Protein content in proso millet grains is comparable with that of wheat, but the share of some essential amino acids (leucine,isoleucine,andmethionine) is substantially higher in proso millet.[32]Among the most commonly consumed products are ready-to-eat breakfast cereals made purely from millet flour,[20][32]and a variety of noodles and bakery products that are, however, often produced from mixtures with wheat flour to improve their sensory quality.[32]
Fermentation products
editStarchderived from millets has been shown to be a good substrate for fermentation and malting with grains having similar starch contents as wheat grains.[33]One study suggested that starch derived from proso millet can be converted toethanolwith an only moderately lower efficiency than starch derived from corn.[34]As proso millet is compatible with low-input agriculture, cultivation on marginal soils for biofuel production may present a new market for farmers.[34]
Pests
editInsect pestsinclude:[35]
- Seedling pests
- shoot flyAtherigona pulla(proso millet shoot fly,[36][37]a major pest in India and Africa)
- Atherigona miliaceae,Atherigona soccata,andA. punctata
- wheat stem maggotMeromyza americanaoccurs in the United States
- thrip,Haplothrips aculeatus
- armywormsMythimna separata,M. unipuncta,Spodoptera exempta,andS. frugiperda
- field cricketBrachytrupessp.
- Stem borers
- Chilo partellus,Ch. suppressalis,Chilo orichalcociliellus,Sesamia inferens,S. cretica,andOstrinia furnacalis
- Leaf feeders
- leaf foldersCnaphalocrocis medinalisandCn. patnalis
- hairy caterpillarSpilosoma obliqua
- rice butterflyMelanitis ledaismene
- Moroccan locustDociostaurus maroccanus
- migratory locustLocusta migratoria
- grasshoppersHieroglyphus banianandOxya chinensis
- Earhead feeders
- cotton boll wormHelicoverpa zea(in the United States)
- Other pests
- aphidSipha flava(in North America)
- earhead bugLeptocorisa acutaand green bugNezara viridulasuck the milky developing grains in India
- termites,Odontotermesspp. andMicrotermesspp., are the common species recorded on proso millet during dry seasons in India.
As a weed
editWeedyandferaltypes are classified asPanicum ruderale(Kitag.) Chang comb. Nov. orPanicum miliaceumsubsp.ruderale.[38]A 2018 report developed amorphometricanalysis method which distinguishesseedsofP. miliaceumandP. ruderaleon the basis of micromorphology.[38][39]
Local names
editNative names for proso millet in its cultivated area include:
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External links
edit- Media related toPanicum miliaceumat Wikimedia Commons
- Alternative Field Crops Manual: Millets