MOISTURE WETTING PATTERNS IN SURFACE AND SUBSURFACE DRIP IRRIGATION SYSTEMS

  • G. Thiyagarajan
  • M. Manikandan
  • M Nagarajan
  • S K Natarajan
Keywords: emitter spacing, lateral placement, soil moisture, surface drip, subsurface drip, wetting pattern

Abstract

Soil moisture patterns from emitters are important for the design and management of drip irrigation systems. The soil moisture distribution pattern around an emitter depends on depth of lateral placement, emitter spacing, duration and frequency of water application, soil physical and hydraulic properties. This experiment was carried out at Agricultural Research Station, Bhavanisagar. Soil moisture measurements were carried out using soil moisture meterafter irrigation at different horizontaland vertical distance (0, 15, 30 and 45 cm). The results indicated that the soil moisture distribution within the soil profile under subsurface drip was to great extent affected by the distance between drippers and variations in discharge. It was also found that, soil moisture distribution varied with variation of lateral location from the soil surface.Soil moisture movement was found to be higher at lower depth of laterals placed at 15 and 30 cm depth.The gradual increment in the moisture content around the dripper was found at the surface layer and vertical layer with increasing the measuring time up to 2 hr at 15 and 30 cm lateral depth. The measurements of soil water content at 2hr indicated that the lower soil layer was the one with higher moisture content at 30 cm depth of placement of lateral irrespective of discharge.Dripper spacing of 30 cm with dripper discharge of 2LPH at 30 cm depth of placement of lateral was found to be higher in soil moisture content of more than 27.2 per cent than of that under 15 cm.

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Author Biographies

G. Thiyagarajan

Water Technology Centre, Tamil Nadu Agricultural University, Coimbatore – 641 003

M. Manikandan

Agricultural Engineering College and Research Institute, Tamil Nadu Agricultural University

M Nagarajan

Agricultural Engineering College and Research Institute, Tamil Nadu Agricultural University, Kumulur – 621 712

S K Natarajan

Department of Agronomy, Tamil Nadu Agricultural University, Coimbatore – 641 003

Published
2019-07-21
How to Cite
Thiyagarajan, G., Manikandan, M., Nagarajan, M., & Natarajan, S. (2019, July 21). MOISTURE WETTING PATTERNS IN SURFACE AND SUBSURFACE DRIP IRRIGATION SYSTEMS. Innovative Farming, 4(4), Under review. Retrieved from http://innovativefarming.in/index.php/innofarm/article/view/364