Agriculture in Thailand is highly competitive, diversified and specialised and its exports are very successful internationally. Rice is the country's most important crop, with some 60 percent of Thailand's 13 million farmers growing it on fully half of Thailand's cultivated land. Thailand is a major exporter in the world rice market. Rice exports in 2014 amounted to 1.3 percent of GDP. Agricultural production as a whole accounts for an estimated 9-10.5 percent of Thai GDP. Forty percent of the population work in agriculture-related jobs. The farmland they work was valued at US$2,945 per rai (0.395 acre; 0.16 ha) in 2013.:9 Most Thai farmers own fewer than eight hectares (50 rai) of land.
Other agricultural commodities produced in significant amounts include fish and fishery products, tapioca, rubber, grain, and sugar. Exports of industrially processed foods such as canned tuna, pineapples, and frozen shrimp are on the rise.
From about 1000 CE, Tai wet glutinous rice culture determined administrative structures in a pragmatic society that regularly produced a saleable surplus. Continuing today, these systems consolidate the importance of rice agriculture to national security and economic well-being.
Agricultural developments have meant that since the 1960s unemployment has fallen from over 60 percent to under 10 percent in the early-2000s. In the same period food prices halved, hunger decreased (from 2.55 million households in 1988 to 418,000 in 2007) and child malnutrition was reduced (from 17 percent in 1987 to seven percent in 2006). This has been achieved through a strong state role in ensuring investment in infrastructure, education, and access to credit and successful private initiatives in the agribusiness sector. This has supported Thailand's transition to an industrialised economy.
Agriculture expanded during the 1960s and 1970s as it had access to new land and unemployed labour. Between 1962 and 1983, the agricultural sector grew by 4.1 percent a year on average and in 1980 it employed over 70 percent of the working population. Yet, the state perceived developments in the agricultural sector as necessary for industrialisation and exports were taxed in order to keep domestic prices low and raise revenue for state investment in other areas of the economy.
As other sectors developed, labourers went in search of work in other sectors of the economy and agriculture was forced to become less labour-intensive and more industrialised. Aided by state laws forcing banks to provide cheap credit to the agricultural sector and by providing its own credit through the Bank for Agriculture and Agricultural Co-operatives (BAAC). The state further invested in education, irrigation, and rural roads. The result was that agriculture continued to grow at 2.2 percent between 1983 and 2007, but also that agriculture now only provides half of rural jobs as farmers took advantage of the investment to diversify.
As agriculture declined in relative financial importance in terms of income, with rising industrialization and Westernisation of Thailand from the 1960s, it continued to provide the benefits of employment and self-sufficiency, rural social support, and cultural custody. Technical and economic globalisation have continued to change agriculture to a food industry which exposed smallholders to such an extent that environmental and human values have declined markedly in all but the poorer areas.
Agribusiness, both privately and government-owned, expanded from the 1960s and subsistence farmers were partly viewed as a past relic which agribusiness could modernise. However, intensive integrated production systems of subsistence farming continued to offer efficiencies that were not financial, including social benefits which have now caused agriculture to be treated as both a social and financial sector in planning, with increased recognition of environmental and cultural values. "Professional farmers" made up 19.5 percent of all farmers in 2004.
Thailand's military government in 2016 introduced "Thailand 4.0", an economic model designed to break Thailand out of the middle income trap. For agriculture, Thailand 4.0 aims at a seven-fold increase in average annual income of farmers from 56,450 baht to 390,000 baht by 2037. It is unclear is how this goal is to be reached, given that Thai farms are small — 43 percent of them are smaller than 10 rai, and another 25 percent are between 10-20 rai. These small plots are already mechanized — 90 percent use machinery. Concomitantly, agricultural research budgets have dropped from 0.9 percent of agricultural GDP in 1994 to only 0.2 percent in 2017. Meanwhile, the population ages. The World Bank estimates that by 2040, 42 percent of Thais will be over 65 years old.:4
The debt profile of small-scale Thai farmers is perilous. The UN estimates that Thai farmers who owned their own land declined from 44 percent in 2004 to just 15 percent in 2011. Farmers have accumulated 338 billion baht in debt. In 2013, the average household debt in Thailand's northeast was 78,648 baht, slightly lower than the national average of 82,572 baht, according to Thailand's Office of Agricultural Economics (OAE). But the region's average monthly household income, at 19,181 baht, was also lower than the national average, 25,194 baht, according to the National Statistics Office. New technologies have also pushed up the entry cost of farming and made it harder for farmers to own their land and fund production. Many farmers have turned to loan sharks to finance their operations. In 2015, nearly 150,000 farmers borrowed 21.59 billion baht from these lenders, according to the Provincial Administration Department.
Thailand has a raw milk production capacity of 2,800 tonnes a day, or just over one million tonnes per year (2015). Forty percent of production goes to a school milk programme and the rest to the commercial dairy sector. According to the Agriculture Ministry, Thailand is the largest producer and exporter of dairy products in ASEAN.
Thailand's School Milk Programme was established in 1985, in response to farmers protests in 1984 on unsold milk. "The principle [sic] objective of the National School Milk Programme is to support the Thai dairy industry, by providing an outlet for locally produced milk....providing milk to the young at an early stage, will...[develop] a taste for milk and hence a market for the future." 
Thailand is the world's third largest producer of crude palm oil, producing approximately two million tonnes per year, or 1.2 percent of global output. Ninety-five percent of Thai production is consumed locally. Almost 85 percent of palm plantations and extraction mills are in south Thailand. At year-end 2016, 4.7 to 5.8 million rai were planted in oil palms, employing 300,000 farmers, mostly on small landholdings of 20 rai. ASEAN as a region accounts for 52.5 million tonnes of palm oil production, about 85 percent of the world total and more than 90 percent of global exports. Indonesia accounts for 52.2 percent of world exports. Malaysian exports total 37.9 percent. The biggest consumers of palm oil are India, the European Union, and China, with the three consuming nearly 50 percent of world exports. Thailand's Department of Internal Trade (DIT) usually sets the price of crude palm oil and refined palm oil. Thai farmers have a relatively low yield compared to those in Malaysia and Indonesia. Thai palm oil crops yield 4-17 percent oil compared to around 20 percent in competing countries. In addition, Indonesian and Malaysian oil palm plantations are 10 times the size of Thai plantations.
Thailand ranks as the world's largest rubber producer and exporter, producing around 4.3 to 4.5 million tonnes per year, It consumes only 519,000 tons per year. It provides about 40 percent of the world's natural rubber, mostly used in aircraft and automobile tires. But the rubber industry has faced a series of challenges. Alongside drought in 2015-2016, Thailand was hit hard by an oversupply in international rubber markets. Following a record harvest in 2011, Thailand increased rubber acreage by 45 percent. Other top producers in the region followed suit. Concomitantly, China's demand for rubber decreased by 10 percent. China is the world's largest natural rubber consumer, using 4,150,000 tons in 2013. At one point the price of the world's benchmark smoked rubber sheet dropped as low as US$1.27 per kilogram, or 80 percent below the record high of US$6.40 per kg in February 2011. Similarly, rubber futures in Shanghai have dropped by 22 percent and the export price of Thai rubber by 23 percent. Then, as prices began to rebound, the southern provinces of Thailand, where two-thirds of the Thai rubber plantations are located, were hit by torrential rains and flooding at the peak of the rubber-tapping season. The Rubber Authority of Thailand forecasts that output will drop 7.6 percent in 2017. Farmers, unable to harvest rubber sap due to high water, are unable to take advantage of the highest rubber prices in four years. Largely due to the flooding, prices for unsmoked USS3 rubber sheets in Nakhon Si Thammarat have increased steadily and reached 84.32 baht (US$2.38) per kilogram in January 2017 and will likely go higher. Rubber growers face an even greater danger: rubber trees die after 20 days when inundated by flood waters.
To aid the Thai rubber industry, the government is spending US$471 million to aid small-scale rubber farmers cultivating up to 15 rai (six acres) of trees. This limit is seen as artificially low by Thai rubber farmers, as up to 80 percent own as much as 25 rai (10 acres). Consequently, in 2016 many farmers are felling their rubber trees to use the land for other crops, with the government pledging an additional US$181 million to support alternative employment for rubber farmers.
Thailand's silkworm farmers cultivate both types of the domesticated silkworms that produce commercial silk: Samia ricini, commonly known as the "eri silkworm", and Bombyx mori, the "mulberry silkworm". The latter, used for most Thai silk, is by far the larger silk producer of the two. The Queen Sirikit Department of Sericulture estimates that in 2013, 71,630 small landholders raised mulberry silkworms on 39,570 rai, producing 287,771 kg of silk cocoons. Another 2,552 farmers grew mulberry silkworms on an industrial scale, producing 145,072 kg of silk on 15,520 rai of land. Eri silk, on the other hand, produces only a fraction of these quantities, grown by a small network of 600 families scattered throughout 28 provinces in north, northeast, and central Thailand.
In Thailand, the Center for Excellence in Silk at Kasetsart University's Kamphaeng Saen campus plays a leading research role in sericulture research as well as providing silkworm eggs and know-how to Thai farmers.
Thailand produces only 60,000 tonnes of soybeans a year, meeting only two percent of a total demand nearing three million tonnes. Thailand imports about two million tonnes annually to meet a growing demand from the livestock and aquaculture sectors both in Thailand and neighbouring countries. Poultry farms and hog operations drive demand in the livestock sector. In aquaculture, shrimp farms are the major consumer of soybean meal. Soybean production in the country has fallen in the past several years due to high production costs largely attributed to wage hikes. Farmers also complain of lower profitability compared with maize and off-season rice.
Thailand is the world's number two sugar exporter, after Brazil. The Office of Cane and Sugar Board (OCSB) forecasts that in the 2016–2017 crop year Thailand is expected produce 91-92 million tonnes of sugarcane, or 9.1-9.2 million tonnes of sugar, down by three million tonnes from the previous 2015–2016 harvest due to drought early in the growing season and excessive rain during the harvest season.
Tapioca (cassava) is grown in 48 of Thailand's 76 provinces. The total area of tapioca plantations in Thailand during crop year 2015-2016 was about 8.8 million rai (1 rai = 1,600 m2), allowing the production of about 33 million tons of native starch. Fifty percent of tapioca in Thailand is grown in the northeast region. The five provinces with the largest tapioca plantations are Nakhon Ratchasima, Kamphaeng Phet, Chaiyaphum, Sa Kaeo, and Chachoengsao.
It is projected that temperatures will continue to rise at a steady rate in every region of Thailand within a range of 1.2-2° Celsius. Annual rainfall is projected to decrease in the central area, but increase in the northern and northeastern regions. Volume of rainfall is projected to be around 1,400 mm per annum over the next five years.
Shaobing Peng of Huazhong Agriculture University in China believes climate change is now affecting the seasonal weather in Thailand. "Global mean surface air temperature has increased by 0.5 degree Celsius in the twentieth century and will continue to increase by 1.5 to 4.5 degrees Celsius this century," he said.
Climate change will have varying effects on Thai crops. Heavy rain may damage the roots of cassava plants in the north, while a decrease in rain might damage cane sugar and rice in the central region. Temperature and quality changes of water might lead to a reduction in the viability of livestock due to heat stress, survival rates of newborn animals, and immune system impacts. Climate change has and will continue to harm rice yields. A study by Okayama University in Japan found that grain yield declines when the average daily temperature exceeds 29 °C (84 °F), and grain quality continues to decline linearly as temperatures rise. Another study found that each degree-Celsius increase in global mean temperature would, on average, reduce yields of rice by 3.2 percent and maize by 7.4 percent. Both are important Thai crops.
Already, due to the drought of 2015-2016, rice production declined 16 percent from 19.8 million tons to 16.5 million. Overall, Thailand lost 6.1 million tonnes of agricultural products worth 15.5 billion baht between January 2015 and April 2016.
To adapt to climate change, the Thai government has initiated plans to introduce drought-resistant seeds. But these seeds are not reusable and can be costly to poor farmers who are not receiving direct financial aid. Government-supplied seeds are also limited, forcing farmers to obtain their seeds from private suppliers. In 2015 60 million rai (960,000 hectares) of rice paddies remained unplanted due to shortages of water, causing many farmers to resort to secondary crops such as sugarcane, cucumber, long beans, and tilapia aquaculture to make sufficient income.
Farmland certified as organic in Thailand amounts to 0.3-0.5 percent of all agricultural land compared with one percent worldwide. From 2010-2014, Thai sales of organic food grew at a seven percent annual rate, compared with five percent for conventional foods. Nevertheless, Thailand's consumption of organic food remains low, with retail sales of just US$0.24 per capita in 2014, compared with US$10 in Japan and US$294 in Switzerland, the world leader. Thailand's leading organic crops are coffee beans, mulberry leaf tea, fresh vegetables and fruit, grown by less than 0.2 percent of Thailand's farmers. Fifty-eight percent of the organic food sold at retail in Thailand is imported.
Due to a program started over forty years ago by a local monk, Surin Province produces about 4,200 tons of organic jasmine rice per year. A local cooperative, the Rice Fund Surin Organic Agriculture Cooperative Ltd, exports its rice to France, Hong Kong, Singapore, Switzerland, and the United States. Surin organic rice farmers receive fifteen baht (US$0.43) per kilogram of paddy, compared with the market price of nine baht/kilo for non-organic jasmine. As the organic rice farmers do not pay for chemical inputs, each can earn about 80,000 baht (US$2,285) per crop, on an average-sized farm of fifteen rai (2.4 hectares).
King Bhumibol was a staunch believer in organic farming. Despite that, successive governments have all promoted chemical-based agriculture. In the 1960s, Thailand joined the so-called "green revolution". Farmers were encouraged to grow new strains of crops that were optimised for chemical inputs. Thailand today is one of the world's top users of farm chemicals. The country imports about 160,000 tonnes of farm chemicals per year at a cost of 22 billion baht. Since 2011, agricultural chemical imports have risen by 50 percent. In 2014, agricultural chemical imports rose over 70 percent to 22 billion baht compared to 2013. According to the World Bank, that makes Thailand the world's fifth biggest consumer of toxic substances, although Thailand ranks only 48th in the world in the extent of its arable land.
In July 2012 consumer action groups demanded that four unlisted toxic pesticides (banned in developed countries) found on common vegetables at levels 100 times EU guidelines be banned. Chemical companies demanded they be added to the Thai Dangerous Substances Act so they can continue to be used, including on exported mangoes to developed countries which have banned their use. In 2014, Khon Kaen University concluded that Thailand should ban 155 types of pesticides, with 14 listed as urgent: Carbofuran, Methyl Bromide, Dichlorvos, Lambda-cyhalothrin, Methidathion-methyl, Omethoate, Zeta Cypermethrin, Endosulfan sulfate, Aldicarb, Azinphos-methyl, Chlorpyrifos-ethyl, Methoxychlor, and Paraquat. Instead, by 2014 the number of active ingredients in imported pesticides increased from 210 to 253. Herbicides were by far the most significant of the imported chemicals, accounting for 80 percent of the total volume, followed by insecticides at nine percent and fungicides at eight percent.
In November 2016, Prime Minister Prayut Chan-o-cha pledged to improve the well-being of farmers over the following five years. He did so in the face of declining rice prices, the lowest in ten years. He said the improvements would result from "smart farmer projects" initiated by the government, part of its 20-year national strategy. Following up on Prayut's remarks, Agriculture and Cooperatives Minister General Chatchai said that the government's strategy would increase farmer income to 390,000 baht per person per year within 20 years. This, he said, would be achieved by increasing the number of large farms to 5,000 nationwide and by switching 500,000 rai from rice cultivation to other crops. The government allocated eight billion baht for the provision of soft loans to farmers in 35 provinces to switch to growing maize on two million rai.
In 2016 rice subsidies were approved for hom mali, white paddy, Pathum Thani fragrant paddy, and glutinous rice. The government will pay up to 13,000 baht per tonne to growers who store their rice until overall rice prices gradually recover.
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