It is produced in the tropical and subtropical portions of all continents. China India Indonesia Japan Thailand Burma 5. U. S. production 0 3.86 million metric tons. Texas Arkansas Louisiana California 7. U. S. is leading rice exporter in world.
Rice is unique among the cereals in being able to germinate and thrive in water.
The rice plant is able to transport oxygen to the submerged roots from the leaves, where oxygen is released during photosynthesis. Rice yields are higher in warm, temperate regions that have low summer rainfall with high light intensity. This is because of disease and low soil fertility in much of humid tropics 5. Upland rice consists of certain varieties that can be grown without irrigation or submergence in areas of high rainfall where soils is wet most of the time. Rice belongs to grass tribe oryzeae.