Estimation of crop water requirement of maize and cotton using fao cropwat 8.0 model in jagtial district
Navatha N, Roja M, Umareddy R
Aims: To estimate the crop water requirement and irrigation schedules for maize crop in Red sandy soils in Rabi season and cotton crop in Kharif season in Red sandy and black soils. Place and Duration of Study: The study area selected for the Jagitial District. The total population of the district is 9.85 lakh and soil which are predominant in this area are Red sandy and Black soils. Agriculture remains the predominant activity in Jagtial District. Methodology: Data is collected from Meteorological observatory, Regional Agricultural Research Station, polasa, Jagtial. In this present study 10 years from 2009 to 2019 of monthly meteorological data were used and Crop data include the number of days at each growth phase, Kc value at each growth phase, root depth, critical depletion value, and crop yield response factor. Results: Results showed that ETo varied from 2.34 to 4.89 mm/day and the effective rainfall varied from 1.5 to 141.4 mm. The irrigation requirements were 220.1 and 100.9 mm/dec for Maize and cotton, respectively. There is more water demand for crops during the dry seasons (summer and autumn) and a lesser demand during the wet seasons (winter and spring). The total gross irrigation and the total net irrigation were 368.5 mm and 258 mm for Maize, 342.1 mm and 136.9 mm for Cotton in red sandy soils, 251.5 mm and 100.6 mm for cotton in black soils. Conclusion: In Rabi Maize crop, available effective rainfall is less to compensate the Crop water requirement. Hence, additional Irrigation requirement is needed to satisfy the Crop water requirement. In red sandy soils cotton crop requires six irrigation schedules and four irrigation schedules in black soils. This paper might be useful to prevent over or under irrigation and planning water management strategies in the Jagtial district for maize and cotton crops.
Navatha N, Roja M, Umareddy R. Estimation of crop water requirement of maize and cotton using fao cropwat 8.0 model in jagtial district. International Journal of Ecology and Environmental Sciences. 2020; 2(4): 718-724.