Indian Journal of Agronomy

  • Year: 2019
  • Volume: 64
  • Issue: 1

Effect of irrigation scheduling and fertigation on nutrient and water-use efficiency in drip-irrigated direct-seeded rice (Oryza sativa)

  • Author:
  • Jagadish1,, B.M. Chittapur2, M.R. Umesh3, B.G. Masthan Reddy4
  • Total Page Count: 6
  • DOI:
  • Page Number: 42 to 47

1Ph. D. Scholar, Department of Agronomy, University of Agricultural Sciences, Raichur, Karnataka, 584 128

Agricultural Research Station, University of Agricultural Sciences, Gangavathi, Raichur, Karnataka, 584 128

2Direcotor of Extension, Department of Agronomy, University of Agricultural Sciences, Raichur, Karnataka, 584 128

3Assistant Professor, Department of Agronomy, University of Agricultural Sciences, Raichur, Karnataka, 584 128

4Professor, Department of Agronomy, University of Agricultural Sciences, Raichur, Karnataka, 584 128

Abstract

A field experiment was conducted during the rainy (kharif) seasons of 2016 and 2017 at Gangavathi, Raichur, Karnataka, to study the effect of irrigation scheduling and fertigation on nitrogen and water-use efficiency of drip-irrigated direct-seeded rice (Oryza sativa L.) in clay soil. The experiment laid out in split-plot design with 4 irrigation scheduling based on irrigation water: cumulative pan evaporation (IW: CPE) ratios assigned to main plots and 4 drip fertigation levels were allocated in subplots and replicated thrice. Irrigation scheduling at an IW: CPE ratio of 1.50 recorded significantly higher nutrient-use efficiency, viz. nitrogen (35.2 kg/kg), phosphorus (85.4 kg/kg) and potassium (102.5 kg/kg) and but lower water-use efficiency (7.69 kg/ha-mm) and water productivity (0.61 kg/m3). Among the drip fertigation levels, drip fertigation at 75% recommended dose of nitrogen (RDN) recorded higher nitrogen-use efficiency (41.5 kg/kg). Treatment of 125% RDN resulted in higher phosphorus-use efficiency and potassium-use efficiency (84.1 and 101.0%, respectively) and water-use efficiency and water productivity (7.22 kg/ha-mm and 0.59 kg/m3 respectively).

Keywords

DSR, Fertigation, Nutrient-use efficiency, IWCPE ratio, Water-use efficiency