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Rice can come in many shapes, colours and sizes. This is a list of rice cultivars, also known as rice varieties.There are several species of grain called rice. [1] Asian rice (Oryza sativa) is most widely known and most widely grown, with two major subspecies (indica and japonica) and over 40,000 varieties. [2]
Oryza sativa, having the common name Asian cultivated rice, [2] is the much more common of the two rice species cultivated as a cereal, the other species being O. glaberrima, African rice. It was first domesticated in the Yangtze River basin in China 13,500 to 8,200 years ago.
Cleavers are annuals with creeping straggling stems which branch and grow along the ground and over other plants. They attach themselves with the small hooked hairs which grow out of the stems and leaves. The stems can reach up to 1.2 metres (4 ft) tall, [9] and are angular or square shaped. [10]
Deepwater rice is a staple food grown on roughly 90,000 km 2 (35,000 sq mi) of land. The main areas where it is grown are in Southeast Asia including Northeastern India, where more than 100 million people rely on its production for their livelihood. [2]
Ceratopteris is a fairly popular aquarium plant, often sold under the name "water sprite." It may be grown as an emersed but natant (floating) plant, or as an immersed plant rooted in the substrate. Under the right conditions the plants will grow fully emerse erect leaves.
Foxtail millet is an annual grass with slim, vertical, leafy stems which can reach a height of 120–200 cm (3 ft 11 in – 6 ft 7 in).. The seedhead is a dense, hairy panicle 5–30 cm (2 in – 1 ft 0 in) long.
Carolina Gold is an heirloom cultivar grown in the early United States, sometimes known as golden-seed rice for the colour of its grains. [15] Long-grain gold-seed rice boasted grains 5 ⁄ 12 inch (11 mm) long (up 11% from 3 ⁄ 8 inch (9.5 mm)), and was brought to market by planter Joshua John Ward in the 1840s. Despite its popularity, the ...
Normally 30–40 kg/ha of seeds are used, but sometimes more than 70 kg/ha are sown, in order to control weeds at time of emergence. For germination and emergence a temperature of 30 °C is optimal. The germination and growth is rapid, and for the upkeep of the crop only weeding is needed.