Title: Rice production in China
Content:   Growing regions  Region 1: Southern China This region includes southern areas of Guizhou, Guandong, Guangxi and Fujian and Hainan provinces as well as Taiwan. This region is subtropical and predominantly grows indica rice. Region 2: Central China The largest region in terms of rice production, spanning from the Chengdu Plains in the west to the eastern coast, from the Huai River in the north to the Nanling Mountains in the south. It also includes parts or all of Hubei, Hunan, Jiangxi, Anhui, Zhejiang, Jiangsu provinces and suburbs of Chongqing and Shanghai. This region is subtropical and predominantly grows Indica, hybrid variants of indica and japonica rice. Region 
Title: Rice production in China
Content:  Southwestern plateau Includes parts or all of Tibet, Sichuan, Qinghai, Yunnan, Guangxi, Hunan, Guizhou provinces as well as the Qingzang and Yungui Plateaus. This region is subtropical and predominantly grows japonica and indica rice. Region 4: Northern China Bordered by the Qinling Mountains, the Yellow River in the south, the Great Wall in the north, and bordered in the west by the Shaanxi Plains. It also includes the entirety of Beijing, Shandong and Tianjin, and parts of Anhui, Shaanxi, Jiangsu, Shanxi, Henan and Hebei provinces. This region is subtropical and predominantly grows indica rice. Region 5: Northeastern China Includes Jinlin and Heilongjiang, as well as Liaoning 
Title: Agriculture in China
Content:   About 75% of China's cultivated area is used for food crops. Rice is China's most important crop, raised on about 25% of the cultivated area. The majority of rice is grown south of the Huai River, in the Zhu Jiang delta, and in the Yunnan, Guizhou, and Sichuan provinces. Wheat is the second most-prevalent grain crop, grown in most parts of the country but especially on the North China Plain, the Wei and Fen River valleys on the Loess plateau, and in Jiangsu, Hubei, and Sichuan provinces. Corn and millet are grown in north and northeast China, and oats are important in Inner Mongolia and Tibet. Other crops include sweet potatoes in the south, white potatoes 
Title: Rice production in China
Content:  Inner Mongolia. This region has the coldest climate out of all the growing regions, with temperatures averaging between 2-10 °C. It predominantly grows indica rice Region 6: Northwestern China Includes Ningxia and Xinjiang, most of Inner Mongolia and Gansu, north-western sections of Liaoning as well as northern sections of Shaanxi, Qinghai and Hebei provinces. This is the driest out of all the regions and predominantly grows japonica rice.  Climate, growing periods and soils  Subtropical This climate is characterised by humidity and warm monsoons, long periods of growth between 180–365 days, cumulative temperatures between 2900-800 °C, precipitation levels between 580-3000mm and 700–3000 hours of sunshine. Soil types 
Title: Economy of China
Content:  worked extensively, and much of the country's timber comes from Heilongjiang, Jilin, Sichuan, and Yunnan. Western China, comprising Tibet, Xinjiang, and Qinghai, has little agricultural significance except for areas of floriculture and cattle raising. Rice, China's most important crop, is dominant in the southern provinces and many of the farms here yield two harvests a year. In the north, wheat is of the greatest importance, while in central China wheat and rice vie with each other for the top place. Millet and kaoliang (a variety of grain sorghum) are grown mainly in the northeast and some central provinces, which, together with some northern areas, 
Title: Rice production in China
Content:  Rice production in China is an important part of the national economy. China is the world's largest producer of rice, making up 30% of global rice production. It produces the highest rice yields in Asia, at 6.5 tonnes per hectare. Rice is produced throughout the nation and is believed to have been domesticated around the Yangtze River Valley and Yellow River from 7000 BC. The main variants of rice grown in China are indica and japonica subspecies, with ongoing developments in hybrid rice. Rice cultivation is labour intensive, and is dependent on a variety of cropping and planting methods, as well as fertiliser and pesticides. Rice is highly prized by consumers as a food grain, making it a staple food for two-thirds of the nation.
Title: Paddy field
Content:  Although China's agricultural output is the largest in the world, only about 15% of its total land area can be cultivated. About 75% of the cultivated area is used for food crops. Rice is China's most important crop, raised on about 25% of the cultivated area. Most rice is grown south of the Huai River, in the Yangtze valley, the Zhu Jiang delta, and in Yunnan, Guizhou, and Sichuan provinces. Rice appears to have been used by the Early Neolithic populations of Lijiacun and Yunchanyan in China. Evidence of possible rice cultivation from ca. 11,500 BP has been found, however it is still questioned whether the rice 
Title: History of agriculture in China
Content:  crops other than rice are also grown, most frequently in hilly areas or during the winter. These include potatoes and winter wheat. The highest grain yields in the country in the mid-1980s were generally found in the Sichuan Basin, the lower Yangtze River Valley, and Guangdong and Fujian provinces, where multiple cropping of rice and other crops was the typical pattern. Cotton, tea, and industrial crops were also produced there. Wheat has traditionally been the main crop in north China, a considerably drier region than south China. The winter wheat crop accounts for nearly 90 percent of China's total production. Spring wheat is grown mainly in 
Title: Rice production in China
Content:   Processes  Cropping systems Cropping systems vary across China due to differences in climate in each growing region. Single rice cropping is predominant in the North, accounting for 17% of the country’s total rice production. Double rice cropping is mainly utilised in the South, accounting for 34% of the country’s production rate. Whilst annual rice-upland crop rotation systems are commonly used in Central regions such as Hubei, Sichuan, Anhui and Jiangsu provinces, as well as near the Yangtze River Valley. Rice-upland systems generate 49% of the nation’s rice production. Planting methods Planting methods depend on the environmental and socioeconomic conditions of a growing region. Common methods of planting include manual, throwing, mechanical, direct seeding (manual and mechanic) and ratooning rice. Manual transplanting is declining in rural areas due to lack of skilled 
Title: Rice production in China
Content:  it is common in areas with smaller land areas, high populations and higher rates of available labour. Direct-seeded rice (dry and wet seeding) has increased since the 1990s, taking up 10% of China’s rice planting area in provinces such as Guandong and Xinjian.  Changes to planting areas  There have been dramatic increases and decreases in arable land and production across China. Increases were found in Northeast provinces such as Jilin and Heilonjiang, whilst increasingly urbanised provinces such as Guandong and Fujian saw decreases. This is due to more farmers and their families looking for a stable occupation in urban areas. As well as challenges to production due to climate change and lower grain production due to over-usage of fertilisers and pesticides. Consequently, prominent rice production areas have shifted to the northeast.

Question: which two regions grow most of china’s rice?
Answer: provinces along the Yangtze River.
provinces in the south.