Cassava is a plant of the genus Cassava in the family Euphorbiaceae.

The cassava tuber is terete; the leaf blade is papery, suborbicular; the sepals are purplish-red, glaucous, with white hairs attached to the tops of the anthers; the fruit is cotton-orbicular; the seed coat is crustaceous, mottled, and smooth, and the flowering period is from September to November. Cassava tubers are used for food, and the name is related to its characteristics.

Cassava is native to Brazil, now widely cultivated in tropical areas around the world, in China, Fujian, Taiwan, Guangdong, Hainan, Yunnan, Guizhou and other provinces and regions are cultivated, occasionally wild. Cassava's adaptability is very strong, drought-resistant, barren, less pests and diseases, do not choose the soil, but to high-yield is still deep and loose soil planting for the best, often born in the mountains in the forest, but also cultivated in the garden. Propagation is by cutting stems.

Cultivation technology of cassava:

Edible cassava generally need to be planted in the frost-free period of about 8 months, the average annual temperature of 18 ℃ and above. The environment of origin for pollution-free cultivation of edible cassava should meet the requirements of DB45/T410.

Cassava should choose better-drained flat land or gently sloping sandy loam land planting, such as planting for ripe land needs to be used 2 years, 3 years and other ways of crop rotation, crop rotation to peanuts, corn, soybeans and mung beans and other crops is preferred. The ground in about 1 month before planting, generally two plows and two harrows, plowing depth of 30 ~ 40cm is appropriate, so that the soil is flat, loose.

Cassava should choose low hydrocyanic acid content (100mg/kg or less), high yield, resistance to pests and diseases and strong resistance and other excellent characteristics of the varieties. China mainly has local bread cassava, South China No. 9, South China 6068, South China No. 12 and GR891 and other edible cassava varieties.