Conventionally rice is being cultivated in continuous submergence conditions.
Hi Dear Shantu Duttarganvi
You can use cropwat software to calculate the maximum water productivity in rice fields.
Dear Abbas;
Crop water productivity or Water productivity index for rice is the ratio yield/water use;
thus max WPI for submergence rice max yield attained /min water use. Its the attributes of Yield potential, maturity period , weather and field water management. A 10ton/ha using 1000mm-ha of water per crop is considered a good benchmark
Beside the mathematical / software / formula approach I would like to give these orientations: A) Most rice in Africa is rain-fed; I assume, world-rice-statistics have a substantial % of non-submerging rice-cropping. B) Submerging of rice is mainly a means of weed-control and not of supplying a physiologically required excessive amount of water; highest rice-yields can well be under non-submerging conditions. C) Thus the crop-water requirements for rice need to be addressed in a more holistic view on options and conditions, also considering the partly enormous costs for irrigation and irrig. infrastructure; D) Considering direct-seeding of rice or transplanting again makes a bit difference in the water-balance. E) Where weed-control can be easily tackled by agro-mechanization or weed-killers or cheap hand-labourforce, a rather dry crop-management can enormously improve the water-productivity. F) Different varieties again show big differences in water-requirements. G) THUS: The maximum water-productivity-rationale needs a bright, smart, logic, young supplement I assume.
Hi Dear Shantu Duttarganvi:
Please go through the following links they can help you
http://www.sciencedirect.com/science/article/pii/S0378377400001281
http://www.fao.org/fileadmin/templates/solaw/files/thematic_reports/TR_07_web.pdf
Thanks and Good Luck
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