Short communication Modeling crop water requirement of grapes by using FAO-CROPWAT model in Quetta district, Balochistan

Modeling of crop water requirement (CWR) assists in water resource planning, regional drainage, effective irrigation scheduling and for determining potential for crop production. ETo (mm day1) is reference evapotranspiration, R (MJ m-2 day-1) is net radiation at the crop surface, G (MJ m2 day1) is soil heat flux density, T (oC) is average air temperature, U2 (m/s) is wind speed at 2m height, ea (kPa) is saturated vapour pressure, ed (kPa) is actual vapour pressure, ea- ed (kPa) is saturated vapour pressure deficit, ? (kPa/ oC) is slope vapour pressure curve, ?(kPa/ oC) is psychrometric constant. Modelling the crop water requirement using FAO-CROPWAT and assessment of water resources for sustainable water resource management: A case study in Palakkad district of humid tropical Kerala, India.