An Optimal Irrigation Scheduling for Drip Irrigated Onion in A- Semi-Arid Region Using the Computer Program CROPWAT 8.0
P. R. Anjitha Krishna *
Department of Soil and Water Engineering, College of Agricultural Engineering, University of Agricultural Sciences, Raichur, India.
B. Maheshwara Babu
Department of Soil and Water Engineering, College of Agricultural Engineering, University of Agricultural Sciences, Raichur, India.
A. T. Dandekar
College of Agriculture, VC Farm, Mandya, University of Agricultural Sciences, Bangalore, India.
R. H. Rajkumar
Department of Soil and Water Engineering, College of Agricultural Engineering, University of Agricultural Sciences, Raichur, India.
G. Ramesh
Department of Soil and Water Engineering, College of Agricultural Engineering, University of Agricultural Sciences, Raichur, India.
S. R. Balanagoudar
Department of Soil Science and Agrl. Chemistry, College of Agriculture, University of Agricultural Sciences, Raichur, India.
*Author to whom correspondence should be addressed.
Abstract
Efficient utilization of available water resources requires appropriate management strategies considering the changing environmental conditions. The present study used a widely adopted crop water requirement estimation model-CROPWAT 8.0 for estimation and scheduling of irrigation requirement for onion crop grown under Vertisol in the Rabi season in the semi-arid region of Raichur district. The soil moisture at the root zone was not allowed to fall below 50% depletion. The irrigation events brought the soil moisture back to the field capacity level. The total water requirement for the 1st and 2nd seasons was 428.77 mm and 399.98 mm respectively at 90% irrigation efficiency. CROPWAT based two days irrigation scheduling scenario was found to be appropriate to maintain optimal soil moisture range within the crop root zone at different crop stages.
Keywords: CROPWAT, irrigation scheduling, onion, rabi, field capacity.