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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]
Rice plant (Oryza sativa) with branched panicles containing many grains on each stem Rice grains of different varieties at the International Rice Research Institute. Rice is a cereal grain and in its domesticated form is the staple food of over half of the world's population, particularly in Asia and Africa.
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.
Wentworth grain size chart from United States Geological Survey Open-File Report 2006-1195: Note size typos; 33.1mm is 38.1 & .545mm is .594 Beach cobbles at Nash Point, South Wales Grain size (or particle size ) is the diameter of individual grains of sediment , or the lithified particles in clastic rocks .
A: Plant; B ripe ear of grains; 1 spikelet before flowering; 2 the same, flowering and spread, enlarged; 3 flowers with glumes; 4 stamens 5 pollen; 6 and 7 ovaries with juice scales; 8 and 9 parts of the scar; 10 fruit husks; 11–14 grains, natural size and enlarged. Cereals are grasses, in the Poaceae family, that produce edible grains.
In terms of grain size, rice grain can be categories into three main groups: length (the size of the rough, brown, or milled rice kernel along its greatest dimension) shape (the ratios between length, width, and thickness) weight (determined by using 1,000-kernel weight.) [clarification needed] [17]
Watery ripe: first grains have reached half their final size 73: Early milk 75: Medium milk: grain content milky 77: Late milk 8: Ripening 83: Early dough 85: Soft dough: grain content soft but dry, fingernail impression not held, grains and glumes still green 87: Hard dough: grain content solid, fingernail impression held 89
Broken rice is fragments of rice grains, broken in the field, during drying, during transport, or during milling. [1] Mechanical separators are used to separate the broken grains from the whole grains and sort them by size. [2] Broken rice is fragmented, not considered to be defective, and beside esthetics, it is equivalent to non-broken rice. [3]