Abstract
For irrigation scheduling and better management of the water, estimation of irrigation water requirement of the crop is essentially required. The study was conducted for estimation of daily reference evapotranspiration (ETo) by FAO Penman-Monteith method using 30 years (1985-2015) mean meteorological data of two locations Sabour (zone III A) and Patna (zone III B) in Bihar. The crop evapotranspiration was estimated using crop coefficients of different crops like rice,kharif maize, wheat, rabi maize, green gram and summer maize at Sabour and Patna locations. Irrigation water requirement for different crops was estimated based on crop evapotranspiration and effective rainfall during the growing period of the crop. The mean annual reference evapotranspiration (ETo) was found 3.6 mmday-1 at Sabour and 4.1 mmday-1 at Patna. The total crop evapotranspiration was maximum for rice crop in kharif season 546.0 and 607.3 mm at Sabour and Patna respectively and lowest for wheat crop in rabi season 212.9 mm and 243.3 mm at Sabour and Patna respectively. Net irrigation water requirement was maximum for summer maize366.3at Sabour and 508.2 mm at Patna for rice crop whereas lowest in kharif maize 67.5 and 161.4 mm at Sabour and Patna respectively.
Highlights
Water is one of the most essential natural resource which plays a vital role in maintaining biodiversity, our health, social welfare and our economic development (Donald, 1968)
The reference evapotranspiration (ETo) plays an importantrole in estimating net irrigation requirement of crops for agricultural planning, irrigation scheduling, regional water balance studies and agro-climatic zoning (Samani, 2000) and accurate estimate of ETO is a key component in hydrological studies
Net irrigation requirement for different crops in kharif, rabi and summer seasons in Gujarat was estimated by Khandelwal and Dhiman (2015). Penman-Monteith method was adopted for (ETO) estimation of the study area which was used for the estimation of net irrigation water requirement of different crops in different seasons
Summary
Water is one of the most essential natural resource which plays a vital role in maintaining biodiversity, our health, social welfare and our economic development (Donald, 1968). The reference evapotranspiration (ETo) plays an importantrole in estimating net irrigation requirement of crops for agricultural planning, irrigation scheduling, regional water balance studies and agro-climatic zoning (Samani, 2000) and accurate estimate of ETO is a key component in hydrological studies. Among all the methods Penman-Monteith method (Allen et al.,1998) has been reported to yield more accurate reference evapotranspiration (ET ) estimates across a wide range of climate condition (Jensen et al, 1990). Mehta and Pandey(2015) used Penman-Monteith method for estimation of reference evapotranspiration for wheat and maize crop in Gujarat. Net irrigation requirement for different crops in kharif, rabi and summer seasons in Gujarat was estimated by Khandelwal and Dhiman (2015). Penman-Monteith method was adopted for (ETO) estimation of the study area which was used for the estimation of net irrigation water requirement of different crops in different seasons
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
