Assessing Yield, Water Use Efficiency and Evapotranspiration with Ameliorating Effect of Potassium in Wheat Crop Exposed to Regulated Deficit Irrigation
DOI:
https://doi.org/10.3923/pjn.2014.168.175Keywords:
Actual evapotranspiration, crop coefficient, root length density, root mass density, water use efficiencyAbstract
Water is the most important factor for plant growth while potassium fertilization plays an important role under deficit irrigation or under stress condition. A pot experiment was conducted to assess the yield and water use efficiency with amelioration effect of potassium in wheat crop exposed to regulated deficit irrigation. Wheat crop was sown for two years. Pot experiment was laid out following CRD with two factorial arrangements. Each treatment was replicated thrice. Wheat variety “Sahar-2006” was sown. All the measures were taken to control weeds, other pests and diseases for the crop management. Soil water content was measured by weighing pot after 1 to 2 day’s interval throughout the growing season. Potential evapotranspiration was calculated using Penman-Montieth model. The ETa was calculated using water balance equation and crop coefficient was calculated from the lysimeter/pot trials. The data obtained was analyzed statistically. The result of this study showed that the maximum grain yield was observed with T1 (HHHHH) at K2 and second best was the T2 (MMMMM: 70-80% FC at all stages) at K2 because it showed minimum reduction in yield and save upto 20-30% water. It also showed the highest water use efficiency (WUE). It was also observed that the soil evaporation decreased with regulated deficit irrigation to some extent but it mostly depend upon on the hydraulic properties of soil. The treatment combination T3 (LLLLL: 60-70% FC at all growth satges) at K2 showed the highest root mass density and root length density during 2010-11 and 2011-12, respectively. Regulated deficit irrigation (RDI) and potassium application have significant effect on crop coefficient (Kc) during 2010-11 and 2011-12 in Winter seasons.
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