Rice

Worldwide rice production

Production of rice (2019)[23]

In 2020, world production of paddy rice was 756.7 million metric tons (834.1 million short tons),[24] led by China and India with a combined 52% of this total.[2] Other major producers were Bangladesh, Indonesia and Vietnam. The five major producers accounted for 72% of total production, while the top fifteen producers accounted for 91% of total world production in 2017. Developing countries account for 95% of the total production.[25]

Rice is a major food staple and a mainstay for the rural population and their food security. It is mainly cultivated by small farmers in holdings of less than one hectare. Rice is also a wage commodity for workers in the cash crop or non-agricultural sectors. Rice is vital for the nutrition of much of the population in Asia, as well as in Latin America and the Caribbean and in Africa; it is central to the food security of over half the world population.

Many rice grain producing countries have significant losses post-harvest at the farm and because of poor roads, inadequate storage technologies, inefficient supply chains and farmer's inability to bring the produce into retail markets dominated by small shopkeepers. A World Bank – FAO study claims 8% to 26% of rice is lost in developing nations, on average, every year, because of post-harvest problems and poor infrastructure. Some sources claim the post-harvest losses exceed 40%.[25][26] Not only do these losses reduce food security in the world, the study claims that farmers in developing countries such as China, India and others lose approximately US$89 billion of income in preventable post-harvest farm losses, poor transport, the lack of proper storage and retail. One study claims that if these post-harvest grain losses could be eliminated with better infrastructure and retail network, in India alone enough food would be saved every year to feed 70 to 100 million people.[27]

The seeds of the rice plant are first milled using a rice huller to remove the chaff (the outer husks of the grain) (see: rice hulls). At this point in the process, the product is called brown rice. The milling may be continued, removing the bran, i.e., the rest of the husk and the germ, thereby creating white rice. White rice, which keeps longer, lacks some important nutrients; moreover, in a limited diet which does not supplement the rice, brown rice helps to prevent the disease beriberi.

Either by hand or in a rice polisher, white rice may be buffed with glucose or talc powder (often called polished rice, though this term may also refer to white rice in general), parboiled, or processed into flour. White rice may also be enriched by adding nutrients, especially those lost during the milling process. While the cheapest method of enriching involves adding a powdered blend of nutrients that will easily wash off (in the United States, rice which has been so treated requires a label warning against rinsing), more sophisticated methods apply nutrients directly to the grain, coating the grain with a water-insoluble substance which is resistant to washing.

In some countries, a popular form, parboiled rice (also known as converted rice and easy-cook rice[28]) is subjected to a steaming or parboiling process while still a brown rice grain. The parboil process causes a gelatinisation of the starch in the grains. The grains become less brittle, and the color of the milled grain changes from white to yellow. The rice is then dried, and can then be milled as usual or used as brown rice. Milled parboiled rice is nutritionally superior to standard milled rice, because the process causes nutrients from the outer husk (especially thiamine) to move into the endosperm, so that less is subsequently lost when the husk is polished off during milling. Parboiled rice has an additional benefit in that it does not stick to the pan during cooking, as happens when cooking regular white rice. This type of rice is eaten in parts of India and countries of West Africa are also accustomed to consuming parboiled rice.

Rice bran, called nuka in Japan, is a valuable commodity in Asia and is used for many daily needs. It is a moist, oily inner layer which is heated to produce oil. It is also used as a pickling bed in making rice bran pickles and takuan.

Raw rice may be ground into flour for many uses, including making many kinds of beverages, such as amazake, horchata, rice milk, and rice wine. Rice does not contain gluten, so is suitable for people on a gluten-free diet.[29] Rice can be made into various types of noodles. Raw, wild, or brown rice may also be consumed by raw-foodist or fruitarians if soaked and sprouted (usually a week to 30 days – gaba rice).

Processed rice seeds must be boiled or steamed before eating. Boiled rice may be further fried in cooking oil or butter (known as fried rice), or beaten in a tub to make mochi.

Rice is a good source of protein and a staple food in many parts of the world, but it is not a complete protein: it does not contain all of the essential amino acids in sufficient amounts for good health, and should be combined with other sources of protein, such as nuts, seeds, beans, fish, or meat.[30]

Rice, like other cereal grains, can be puffed (or popped). This process takes advantage of the grains' water content and typically involves heating grains in a special chamber. Further puffing is sometimes accomplished by processing puffed pellets in a low-pressure chamber. The ideal gas law means either lowering the local pressure or raising the water temperature results in an increase in volume prior to water evaporation, resulting in a puffy texture. Bulk raw rice density is about 0.9 g/cm³. It decreases to less than one-tenth that when puffed.

• 
  Rice processing
  A: Rice with chaff
  B: Brown rice
  C: Rice with germ
  D: White rice with bran residue
  E: Polished
  (1): Chaff
  (2): Bran
  (3): Bran residue
  (4): Cereal germ
  (5): Endosperm
• 
  Unmilled to milled Japanese rice, from left to right, brown rice, rice with germ, white rice

Unmilled rice, known as "paddy" (Indonesia and Malaysia: padi; Philippines, palay), is usually harvested when the grains have a moisture content of around 25%. In most Asian countries, where rice is almost entirely the product of smallholder agriculture, harvesting is carried out manually, although there is a growing interest in mechanical harvesting. Harvesting can be carried out by the farmers themselves, but is also frequently done by seasonal labor groups. Harvesting is followed by threshing, either immediately or within a day or two. Again, much threshing is still carried out by hand but there is an increasing use of mechanical threshers. Subsequently, paddy needs to be dried to bring down the moisture content to no more than 20% for milling.

A familiar sight in several Asian countries is paddy laid out to dry along roads. However, in most countries the bulk of drying of marketed paddy takes place in mills, with village-level drying being used for paddy to be consumed by farm families. Mills either sun dry or use mechanical driers or both. Drying has to be carried out quickly to avoid the formation of molds. Mills range from simple hullers, with a throughput of a couple of tonnes a day, that simply remove the outer husk, to enormous operations that can process 4 thousand metric tons (4.4 thousand short tons) a day and produce highly polished rice. A good mill can achieve a paddy-to-rice conversion rate of up to 72% but smaller, inefficient mills often struggle to achieve 60%. These smaller mills often do not buy paddy and sell rice but only service farmers who want to mill their paddy for their own consumption.

• 
  Rice combine harvester in Chiba Prefecture, Japan
• 
  After the harvest, rice straw is gathered in the traditional way from small paddy fields in Mae Wang District, Thailand
• 
  Burning of rice residues to prepare the land for wheat planting in Sangrur, India
• 
  Drying rice in Peravoor, India

Because of the importance of rice to human nutrition and food security in Asia, the domestic rice markets tend to be subject to considerable state involvement. While the private sector plays a leading role in most countries, agencies such as BULOG in Indonesia, the NFA in the Philippines, VINAFOOD in Vietnam and the Food Corporation of India are all heavily involved in purchasing of paddy from farmers or rice from mills and in distributing rice to poorer people. BULOG and NFA monopolise rice imports into their countries while VINAFOOD controls all exports from Vietnam.[31]

World trade figures are much smaller than those for production, as less than 8% of rice produced is traded internationally.[32] In economic terms, the global rice trade was a small fraction of 1% of world mercantile trade. Many countries consider rice as a strategic food staple, and various governments subject its trade to a wide range of controls and interventions.

Developing countries are the main players in the world rice trade, accounting for 83% of exports and 85% of imports. While there are numerous importers of rice, the exporters of rice are limited. Just five countries—Thailand, Vietnam, China, the United States and India—in decreasing order of exported quantities, accounted for about three-quarters of world rice exports in 2002.[25] However, this ranking has been rapidly changing in recent years. In 2010, the three largest exporters of rice, in decreasing order of quantity exported were Thailand, Vietnam and India. By 2012, India became the largest exporter of rice with a 100% increase in its exports on year-to-year basis, and Thailand slipped to third position.[33][34] Together, Thailand, Vietnam and India accounted for nearly 70% of the world rice exports.

The primary variety exported by Thailand and Vietnam were Jasmine rice, while exports from India included aromatic Basmati variety. China, an exporter of rice in the early 2000s, had become a net importer of rice by 2010.[32][35] According to a USDA report, the world's largest exporters of rice in 2012 were India (9.75 million metric tons (10.75 million short tons)), Vietnam (7 million metric tons (7.7 million short tons)), Thailand (6.5 million metric tons (7.2 million short tons)), Pakistan (3.75 million metric tons (4.13 million short tons)) and the United States (3.5 million metric tons (3.9 million short tons)).[36]

Major importers usually include Nigeria, Indonesia, Bangladesh, Saudi Arabia, Iran, Iraq, Malaysia, the Philippines, Brazil and some African and Persian Gulf countries. In common with other West African countries, Nigeria is actively promoting domestic production. However, its very heavy import duties (110%) open it to smuggling from neighboring countries.[37] Parboiled rice is particularly popular in Nigeria. Although China and India are the two largest producers of rice in the world, both countries consume the majority of the rice produced domestically, leaving little to be traded internationally.

The average world yield for rice was 4.3 metric tons per hectare (1.9 short tons per acre), in 2010. Australian rice farms were the most productive in 2010, with a nationwide average of 10.8 metric tons per hectare (4.8 short tons per acre).[38]

Yuan Longping of China National Hybrid Rice Research and Development Center set a world record for rice yield in 2010 at 19 metric tons per hectare (8.5 short tons per acre) on a demonstration plot. In 2011, this record was reportedly surpassed by an Indian farmer, Sumant Kumar, with 22.4 metric tons per hectare (10.0 short tons per acre) in Bihar, although this claim has been disputed by both Yuan and India's Central Rice Research Institute. These efforts employed newly developed rice breeds and System of Rice Intensification (SRI), a recent innovation in rice farming.[39][40][41][42]

Food consumption of rice in 2013 (millions of metric tons of paddy equivalent)[43]
China	162.4
India	130.4
Indonesia	50.4
Bangladesh	40.3
Vietnam	19.9
Philippines	17.6
Thailand	11.5
Japan	11.4

As of 2013, world food consumption of rice was 565.6 million metric tons (623.5 million short tons) of paddy equivalent (377,283 metric tons (415,883 short tons) of milled equivalent), while the largest consumers were China consuming 162.4 million metric tons (179.0 million short tons) of paddy equivalent (28.7% of world consumption) and India consuming 130.4 million metric tons (143.7 million short tons) of paddy equivalent (23.1% of world consumption).[43]

Between 1961 and 2002, per capita consumption of rice increased by 40% worldwide.[44] Rice is the most important crop in Asia. In Cambodia, for example, 90% of the total agricultural area is used for rice production.[45] Per capita, Bangladesh ranks as the country with the highest rice consumption, followed by Laos, Cambodia, Vietnam and Indonesia.[46]

U.S. rice consumption has risen sharply over the past 25 years, fueled in part by commercial applications such as beer production.[47] Almost one in five adult Americans now report eating at least half a serving of white or brown rice per day.[48]

The worldwide production of rice accounts for more greenhouse gas emissions (GHG) in total than that of any other plant food.[49] It was estimated in 2021 to be responsible for 30% of agricultural methane emissions and 11% of agricultural nitrous oxide emissions.[50] Methane release is caused by long-term flooding of rice fields, inhibiting the soil from absorbing atmospheric oxygen, a process causing anaerobic fermentation of organic matter in the soil.[51] A 2021 study estimated that rice contributed 2 billion tonnes of anthropogenic greenhouse gases in 2010,[49] of the 47 billion total.[52] The study added up GHG emissions from the entire lifecycle, including production, transportation, and consumption, and compared the global totals of different foods.[53] The total for rice was half the total for beef.[49]

A 2010 study found that, as a result of rising temperatures and decreasing solar radiation during the later years of the 20th century, the rice yield growth rate has decreased in many parts of Asia, compared to what would have been observed had the temperature and solar radiation trends not occurred.[54][55] The yield growth rate had fallen 10–20% at some locations. The study was based on records from 227 farms in Thailand, Vietnam, Nepal, India, China, Bangladesh, and Pakistan. The mechanism of this falling yield was not clear, but might involve increased respiration during warm nights, which expends energy without being able to photosynthesize. More detailed analysis of rice yields by the International Rice Research Institute forecast 20% reduction in yields in Asia per degree Celsius of temperature rise. Rice becomes sterile if exposed to temperatures above 35 °C (95 °F) for more than one hour during flowering and consequently produces no grain.[56][57]

Rice requires slightly more water to produce than other grains.[58] Rice production uses almost a third of Earth's fresh water.[59] Water outflows from rice fields through transpiration, evaporation, seepage, and percolation.[60] It is estimated that it takes about 2,500 litres (660 US gal) of water need to be supplied to account for all of these outflows and produce 1 kilogram (2 lb 3 oz) of rice.[60]

Chinese rice grasshopper
(Oxya chinensis)
Borneo, Malaysia

Major rice insect pests include: the brown planthopper (BPH),[64] several species of stemborers—including those in the genera Scirpophaga and Chilo,[65] the rice gall midge,[66] several species of rice bugs,[67] notably in the genus Leptocorisa,[68] defoliators such as the rice: leafroller, hispa and grasshoppers.[69] The fall army worm, a species of Lepidoptera, also targets and causes damage to rice crops.[70] Rice weevils attack stored produce.

Several nematode species infect rice crops, causing diseases such as ufra (Ditylenchus dipsaci), white tip disease (Aphelenchoide bessei), and root knot disease (Meloidogyne graminicola). Some nematode species such as Pratylenchus spp. are most damaging to upland rice of all parts of the world. Rice root nematode (Hirschmanniella oryzae) is a migratory endoparasite which on higher inoculum levels leads to complete destruction of a rice crop. Beyond being obligate parasites, they decrease the vigor of plants and increase the plants' susceptibility to other pests and diseases.[71][72]

Other pests include the apple snail (Pomacea canaliculata), panicle rice mite, rats,[73] and the weed Echinochloa crus-galli.[74]

Rice blast, caused by the fungus Magnaporthe grisea (syn. M. oryzae, Pyricularia oryzae),[75] is the most significant disease affecting rice cultivation. It and bacterial leaf streak (caused by Xanthomonas oryzae pv. oryzae) are perennially the two worst rice diseases worldwide, and such is their importance – and the importance of rice – that they are both among the worst 10 diseases of all plants.[76] A 2010 review reported clones for quantitative disease resistance in plants.[77] The plant responds to the blast pathogen by releasing jasmonic acid, which then cascades into the activation of further downstream metabolic pathways which produce the defense response.[78] This accumulates as methyl-jasmonic acid.[78] The pathogen responds by synthesizing an oxidizing enzyme which prevents this accumlation and its resulting alarm signal.[78] OsPii-2 was discovered by Fujisaki et al., 2017.[79] It is a nucleotide-binding leucine-rich repeat receptor (NB-LRR, NLR), an immunoreceptor.[79] It includes an NOI domain (NO₃-induced) which binds rice's own Exo70-F3 protein.[79] This protein is a target of the M. oryzae effector AVR-Pii and so this allows the NLR to monitor for Mo's attack against that target.[79]

Other major fungal and bacterial rice diseases include sheath blight (caused by Rhizoctonia solani), false smut (Ustilaginoidea virens), bacterial panicle blight (Burkholderia glumae),[80] sheath rot (Sarocladium oryzae), and bakanae (Fusarium fujikuroi).[81] Viral diseases exist, such as rice ragged stunt (vector: BPH), and tungro (vector: Nephotettix spp).[82] Many viral diseases, especially those vectored by planthoppers and leafhoppers, are major causes of losses across the world.[83] There is also an ascomycete fungus, Cochliobolus miyabeanus, that causes brown spot disease in rice.[84][85][81]

The gene OsSWEET13 produces the molecular target of the Xanthomonas oryzae pv. oryzae effector PthXo2. [86] Some cultivars carry resistance alleles.[86]

Crop protection scientists are trying to develop rice pest management techniques which are sustainable. In other words, to manage crop pests in such a manner that future crop production is not threatened.[87] Sustainable pest management is based on four principles: biodiversity, host plant resistance, [88] landscape ecology, and hierarchies in a landscape—from biological to social.[89] At present, rice pest management includes cultural techniques, pest-resistant rice varieties,[88] and pesticides (which include insecticide). Increasingly, there is evidence that farmers' pesticide applications are often unnecessary, and even facilitate pest outbreaks.[90][91][92][93] By reducing the populations of natural enemies of rice pests,[94] misuse of insecticides can actually lead to pest outbreaks.[95] The International Rice Research Institute (IRRI) demonstrated in 1993 that an 87.5% reduction in pesticide use can lead to an overall drop in pest numbers.[96] IRRI also conducted two campaigns in 1994 and 2003, respectively, which discouraged insecticide misuse and smarter pest management in Vietnam.[97][98]

Rice plants produce their own chemical defenses to protect themselves from pest attacks. Some synthetic chemicals, such as the herbicide 2,4-D, cause the plant to increase the production of certain defensive chemicals and thereby increase the plant's resistance to some types of pests.[99] Conversely, other chemicals, such as the insecticide imidacloprid, can induce changes in the gene expression of the rice that cause the plant to become more susceptible to attacks by certain types of pests.[100] 5-Alkylresorcinols are chemicals that can also be found in rice.[101]

Chloroxylon, the satinwood tree (rue family), is used for pest management in organic cultivation in Chhattisgarh.

Botanicals, so-called "natural pesticides", are used by some farmers in an attempt to control rice pests. Botanicals include extracts of leaves, or a mulch of the leaves themselves. Some upland rice farmers in Cambodia spread chopped leaves of the bitter bush (Chromolaena odorata) over the surface of fields after planting. This practice probably helps the soil retain moisture and thereby facilitates seed germination. Farmers also claim the leaves are a natural fertilizer and helps suppress weed and insect infestations.[102]

Among rice cultivars, there are differences in the responses to, and recovery from, pest damage.[67][103][88] Many rice varieties have been selected for resistance to insect pests.[104][105][88] Therefore, particular cultivars are recommended for areas prone to certain pest problems.[88] The genetically based ability of a rice variety to withstand pest attacks is called resistance. Three main types of plant resistance to pests are recognized as nonpreference, antibiosis, and tolerance.[106] Nonpreference (or antixenosis) describes host plants which insects prefer to avoid; antibiosis is where insect survival is reduced after the ingestion of host tissue; and tolerance is the capacity of a plant to produce high yield or retain high quality despite insect infestation.[107]

Over time, the use of pest-resistant rice varieties selects for pests that are able to overcome these mechanisms of resistance. When a rice variety is no longer able to resist pest infestations, resistance is said to have broken down. Rice varieties that can be widely grown for many years in the presence of pests and retain their ability to withstand the pests are said to have durable resistance. Mutants of popular rice varieties are regularly screened by plant breeders to discover new sources of durable resistance.[106][108]

Rice is parasitized by the hemiparasitic eudicot weed Striga hermonthica,[109] which is of local importance for this crop.

The high-yielding varieties are a group of crops created intentionally during the Green Revolution to increase global food production. This project enabled labor markets in Asia to shift away from agriculture, and into industrial sectors. The first "Rice Car", IR8 was produced in 1966 at the International Rice Research Institute which is based in the Philippines at the University of the Philippines' Los Baños site. IR8 was created through a cross between an Indonesian variety named "Peta" and a Chinese variety named "Dee Geo Woo Gen."[121]

Scientists have identified and cloned many genes involved in the gibberellin signaling pathway, including GAI1 (Gibberellin Insensitive) and SLR1 (Slender Rice). Disruption of gibberellin signaling can lead to significantly reduced stem growth leading to a dwarf phenotype. Photosynthetic investment in the stem is reduced dramatically as the shorter plants are inherently more stable mechanically. Assimilates become redirected to grain production, amplifying in particular the effect of chemical fertilizers on commercial yield. In the presence of nitrogen fertilizers, and intensive crop management, these varieties increase their yield two to three times.[122]

Ventria Bioscience has genetically modified rice to express lactoferrin, lysozyme which are proteins usually found in breast milk, and human serum albumin, These proteins have antiviral, antibacterial, and antifungal effects.[129]

Rice containing these added proteins can be used as a component in oral rehydration solutions which are used to treat diarrheal diseases, thereby shortening their duration and reducing recurrence. Such supplements may also help reverse anemia.[130]

Due to the varying levels that water can reach in regions of cultivation, flood tolerant varieties have long been developed and used. Flooding is an issue that many rice growers face, especially in South and South East Asia where flooding annually affects 20 million hectares (49 million acres).[131] Standard rice varieties cannot withstand stagnant flooding of more than about a week,[132] mainly as it disallows the plant access to necessary requirements such as sunlight and essential gas exchanges, inevitably leading to plants being unable to recover.[131] In the past, this has led to massive losses in yields, such as in the Philippines, where in 2006, rice crops worth $65 million were lost to flooding.[133] Recently developed cultivars seek to improve flood tolerance.

Drought represents a significant environmental stress for rice production, with 19–23 million hectares (47–57 million acres) of rainfed rice production in South and South East Asia often at risk.[134][135] Under drought conditions, without sufficient water to afford them the ability to obtain the required levels of nutrients from the soil, conventional commercial rice varieties can be severely affected—for example, yield losses as high as 40% have affected some parts of India, with resulting losses of around US$800 million annually.[136]

The International Rice Research Institute conducts research into developing drought-tolerant rice varieties, including the varieties 5411 and Sookha dhan, currently being employed by farmers in the Philippines and Nepal respectively.[135] In addition, in 2013 the Japanese National Institute for Agrobiological Sciences led a team which successfully inserted the DEEPER ROOTING 1 (DRO1) gene, from the Philippine upland rice variety Kinandang Patong, into the popular commercial rice variety IR64, giving rise to a far deeper root system in the resulting plants.[136] This facilitates an improved ability for the rice plant to derive its required nutrients in times of drought via accessing deeper layers of soil, a feature demonstrated by trials which saw the IR64 + DRO1 rice yields drop by 10% under moderate drought conditions, compared to 60% for the unmodified IR64 variety.[136][137]

Soil salinity poses a major threat to rice crop productivity, particularly along low-lying coastal areas during the dry season.[134][138] For example, roughly 1 million hectares (2.5 million acres) of the coastal areas of Bangladesh are affected by saline soils.[139] These high concentrations of salt can severely affect rice plants' normal physiology, especially during early stages of growth, and as such farmers are often forced to abandon these otherwise potentially usable areas.[140][141]

Progress has been made, however, in developing rice varieties capable of tolerating such conditions; the hybrid created from the cross between the commercial rice variety IR56 and the wild rice species Oryza coarctata is one example.[142] O. coarctata is capable of successful growth in soils with double the limit of salinity of normal varieties, but lacks the ability to produce edible rice.[142] Developed by the International Rice Research Institute, the hybrid variety can utilise specialised leaf glands that allow for the removal of salt into the atmosphere. It was initially produced from one successful embryo out of 34,000 crosses between the two species; this was then backcrossed to IR56 with the aim of preserving the genes responsible for salt tolerance that were inherited from O. coarctata.[140] Extensive trials are planned prior to the new variety being available to farmers by approximately 2017–18.[140]

The irrigated rice (paddy) crop in Egypt has a salt tolerance of ECe=5.5 dS/m beyond which the yield declines.[143]

Producing rice in paddies is harmful for the environment due to the release of methane by methanogenic bacteria. These bacteria live in the anaerobic waterlogged soil, and live off nutrients released by rice roots. Researchers have recently reported in Nature that putting the barley gene SUSIBA2 into rice creates a shift in biomass production from root to shoot (above ground tissue becomes larger, while below ground tissue is reduced), decreasing the methanogen population, and resulting in a reduction of methane emissions of up to 97%. Apart from this environmental benefit, the modification also increases the amount of rice grains by 43%, which makes it a useful tool in feeding a growing world population.[144][145]