Three levels of soil water content were designed in irrigated paddy field to observe their physiological effects on rice root activities. It was found in this experiments that the growth center shifting, grain filling, ripening and root senescence were undergoing neglect of the water contents. It was also observed that the above changes was more significant in no-flooding irrigation treatment than the conventional flooding irrigation (CK). There were 45 days from initial heading to harvesting, and one-time ...