PJB-2023-79
Modelling crop water use efficiency under value added fertilizer and reduced irrigation
Aqeel Abbas
Abstract
Fertilizer management and management of irrigation management issues are closely related to each other. Where imbalanced application of fertilizer and irrigation is leading to loss of nutrients through leaching. A field experiment was conducted on three irrigation levels i.e., 50% Available water content (AWC), 75% AWC and 100% AWC with normal vs value added fertilizers (DAP (50kg/acre), MOP vs Zarkhez plus (50 kg/acre), Zabardast-urea and Zinc coated urea (100kg/acre). Randomized complete block design was used and treatments replicated thrice. HYDRUS-1D model was used as validation and simulation. The input parameter was climatic data (ETO by Penmen Monteith equation, Rainfall, temperature, Kc and crop description), crop data (maximum rooting depth, % area covered by crop, initial moisture contents) soil data (Conditions and available soil moisture, irrigation scheduling criteria) and Irrigation data. Maize crop was used as model crop. The growth parameters and yield attributes were recorded. CIRAS was used for the collection of physiological parameters like transpiration rate, net photosynthesis, stomatal conductance and sub stomatal conductance. Pre sowing and post harvesting analysis of soil was carried out for physical and chemical (EC, pH, organic matter). ANOVA was employed for data analysis and means were compared by LSD at 5% level of significance. Results from experiment reported that the growth, yield and yield contributing parameters at par statistically.
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