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Because cultivation is so widespread, development of four distinct types of ecosystems has occurred.They are commonly referred to as irrigated, rainfed lowland, upland, and flood-prone agroecological zones.As well as rice, they include maize, wheat, sorghum, barley, oats, and sugar cane.Typically, grass species are annual plants or are herbaceous perennials that die back to the ground at the end of the growing season and then regenerate the next season by shoots developing from underground root systems.Javanica types of rice fall between japonica and indica varieties in terms of yield, use, and hardiness.


It can be low lying, drought-prone, rolling, or steep sloping.

Shoots generally are characterized by swollen nodes or bases.


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