Hainan
Hainan is China’s southernmost province and an important part of the country’s South Winter Cropping potato region. Its tropical and subtropical maritime climate allows agricultural production during the winter months when much of northern China is too cold for open-field potato cultivation. Hainan is frost-free, but its winter temperatures are considerably lower than those of summer, creating a seasonal window in which potatoes can develop tubers under more suitable conditions. China’s agricultural classification places the whole of Hainan within the South Winter-Cropping zone, alongside Guangdong, Guangxi, southern Fujian and Taiwan.
Potatoes in Hainan are primarily grown as a winter crop, making use of land that can otherwise remain underutilized between major cropping seasons. National production guidance identifies Hainan as part of the winter potato area where early and medium-early fresh market varieties are planted during the cooler season. The wider South Winter Cropping zone has developed into an important source of fresh potatoes for markets outside the region, supported by the ability to produce potatoes during periods when supplies from northern production areas are limited.
The principal production challenge is balancing Hainan’s warm climate with the potato plant’s preference for relatively cool conditions during tuber formation. Temperature, rainfall, sunlight and disease pressure can affect yield and tuber quality, while excessive warmth can reduce the suitability of some varieties. Consequently, variety selection, planting date, seed tuber preparation, drainage and disease management are important components of production. Research specifically conducted in Hainan has demonstrated that locally evaluated cultivars can differ substantially in yield, growth period, quality and disease resistance, highlighting the importance of regional variety testing.
Potato cultivation in Hainan developed within the broader expansion of winter agriculture in southern China. Although potatoes had become established as a crop in China much earlier, the systematic use of winter farmland for potato production gained importance as agricultural systems increasingly sought crops that could fit between rice and other seasonal crops. Research on China's potato industry has specifically identified the use of winter fallow fields as an opportunity to expand potato production and improve land-use efficiency. Hainan's agricultural transformation during the late 20th century also encouraged greater use of winter farmland for commercially valuable crops rather than leaving large areas fallow.
By the 21st century, winter potato production had become part of the wider agricultural system of southern China, and Hainan was included among the country's recognized South Winter Cropping potato areas. Research and variety selection programmes subsequently focused on identifying cultivars adapted to Hainan's winter conditions. A Hainan comparative trial published in 2014 evaluated five introduced potato varieties and found that ‘Hongyun’ and ‘Ziyang’ performed well in terms of yield, quality, disease resistance and growth period, with recorded yields of approximately 17.8 and 20.1 tonnes per hectare, respectively. Such trials illustrate the shift from general potato cultivation toward more systematic selection of varieties suited to Hainan's specific production environment.
