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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]
In agriculture, grain quality depends on the use of the grain.In ethanol production, the chemical composition of grain such as starch content is important, in food and feed manufacturing, properties such as protein, oil and sugar are significant, in the milling industry, soundness is the most important factor to consider when it comes to the quality of grain.
Rice husk ash has long been used in ceramic glazes in rice growing regions in the Far East, e.g. China and Japan. [2] Being about 95% silica, it is an easy way of introducing the necessary silica into the glaze, and the small particle size helps with an early melt of the glaze. [citation needed]
Some varieties of long-grain rice that are high in amylopectin, known as Thai Sticky rice, are usually steamed. [2] A stickier short-grain rice is used for sushi; [3] the stickiness allows rice to hold its shape when cooked. [4] Short-grain rice is used extensively in Japan, [5] including to accompany savoury dishes. [6]
In the case of rice, milling outturns can vary from 60% or less to around 67%, depending on the efficiency of the mill. Even a 1% increase in yield of whole grain rice can thus result in huge increases in national food resources. Grains are produced on a seasonal basis. In many places there is only one harvest a year.
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Currently, there are three main empirical models which are used to calculate the grinding work required relative to grain size and quantity. The Kick model may be utilized for grains with diameters greater than 50 mm; the Bond model for grain diameter between 0.05 mm – 50 mm; the Von Rittinger model for grain less than 0.05 mm.