Abstract
An attempt has been made to estimate the crop evapotranspiration (ETc) and Kc under alternate wetting and drying method (AWD) of water management of rice (Oryza sativa L.) under lowland condition during 2013 and 2014 at Rajendranagar, Hyderabad. The average seasonal ETc was highest in continuous submergence (Cs) of 3-cm depth from transplanting to panicle initiation (PI) and 5-cm from PI to physiological maturity (PM) (657.8 mm) followed by AWD irrigation regimes of flooding to a water depth of 5-cm between15 DAT to PM and when ponded water level drops to 5-cm below ground level in field water tube (628 mm). The results suggested that the roots of rice were able to extract adequate amount of water to satisfy its ETc needs for 2-7 days in different treatments of AWD. The mean crop coefficient values worked out were 1.35, 1.59, 1.81 and 1.33 at initial establishment stage, vegetative and panicle initiation stage, at panicle development stage and at ripening and maturity stage.
Highlights
Rice (Oryza sativa L.) is one of the world’s major food crops and as well as for India
During developmental stage the ETc varied between 104.3 mm in I4 treatment to 138.8 mm in I treatment
The ETc is a physical process taking place continuously from a periodicallyreplenished source of water and variable potential viz., soil moisture reservoir to a sink of virtually unlimited capacity i.e. the atmosphere
Summary
Rice (Oryza sativa L.) is one of the world’s major food crops and as well as for India. To determine the timing of AWD irrigation practice, the water level in the soil is monitored bya field water tube. Field water tube is practical device to monitor the depth of ponded water in the field for implementing AWD irrigation practice. The tube is placed vertically to 20 cm depth inside the soil in a flat area of the field close to a bund for easy monitoring of water level drop in the tube. The practice of “safe” AWD promoted as a mature water-saving technology entails irrigation when water level fall in to a threshold depth below the soil surface (Bouman et al, 2007). In light of the concerns about irrigation water scarcity due to recurrent droughts in Telangana, the present experiment was designed to estimate the crop evapotranspiration and crop coefficients of rice (Oryza sativa L.) under low land condition
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