25-08-2017, 09:32 PM
RICE
RICE.pptx (Size: 2.72 MB / Downloads: 28)
ORIGIN OF RICE
Oryza sativa has originated in South East Asia however, exact place and date of its origin or domestication is unknown with certainty. But it is predicted to have been cultivated in China for nearly 5,000 years.
Archaeological evidence from the Yung Shao excavations in China shows the remains of rice that is dated to 2,600 B.C. There are many religious ceremonies associated with rice since ancient times. There are other evidences also which suggest that rice may have originated in China.
Productions
Rice is grown over a millions of hectares of land in tropical and subtropical areas
Over 80% of the rice comes from China, India, Japan, Bangladesh, Pakistan and other adjoining islands of pacific
Small quantity is also contributed by Spain and Italy
China is the leading producer of rice and India comes the second
UN is the smallest producers of rice
Morphology
Semi-aquatic and annual grass
Short internodes and increase progressively
Has shallow root system
Has cylindrical jointed stem
The leaves are born alternately on the stem
At the junction of leaf sheath and blade there is colorless and membranous ligule
Leaves are longer than broad and has spiny hairs on the margins of the blades
Economic uses
Essential diet components in different forms
Used in beverages
Husks or hulls as cattle feeds
Hulls are used for cushion, fuels
Used as a source of silicon in making soaps, polishes and other cleaning agents
Papers are also made from straw
Straws are also used as fooder
Rice is also associated with many religious ceremony