ELECTRICAL TECHNIQUE FOR MONITORING WETTING PATTERN UNDER TRICKLE SOURCE

Ismail, S. M.; Zin El-Abedin, T. K.; Abd El-Al, A.

doi:10.21608/mjae.2017.96537

ELECTRICAL TECHNIQUE FOR MONITORING WETTING PATTERN UNDER TRICKLE SOURCE

Document Type : Original Article

Authors

¹ Prof. of Irrigation Systems Eng., Ag. Eng. Dept., Fac. of Ag. (EL-Shatby), Alexandria Univ., Egypt.

² Lecturer of Irrigation Systems Eng., Ag. Eng. Dept., Fac. of Ag. (EL-Shatby), Alexandria Univ., Egypt.

10.21608/mjae.2017.96537

Abstract

Knowledge of the wetted pattern dimensions is important in designing and managing efficient drip irrigation systems. Distance between emitters, root zone depth and emitter flow rates must be matched to the soil’s wetting characteristics and the amount and timing of water to be supplied to meet the crop needs. To estimate the wetted pattern dimensions correctly during laboratory experiments in soil section, the wetting front progress should be allowed to move freely into the soil profile in all directions. The developed technique depending on number of electric circuits distributed on steel axes (electrical measurement axes) inside a wooden rectangular soil box was used to determine the wetting front movement. This technique of determining wetted pattern dimension, avoids the side effects of the Plexiglass wall, in conventional technique, on the soil moisture movement. As a result, the obtained wetted pattern agrees closely to that described by Zur (1999) and Ismail et. al (2006).

Keywords

Main Subjects

Agricultural Irrigation and Drainage Engineering

References

Abd El-Al A. ( 2007 ). Comparison of Some Different Methods of Estimating Drip Irrigation Wetted Pattern . M.Sc. thesis, Agric. Eng. Dep., Faculty of Agric., EL-Shatby, AlexandriaUniversity.

Allen R. G., J. Amsler and V. Bagarello, 1999. CIGR Handbook of Agricultural Engineering Volume I. The American Society of Agricultural Engineers. LCCN 98-93767. ISBN 1-892769-01-8.

Bresler, E., 1975. Two-dimensional transport of solute during nonsteady infiltration from a trickle source. Soil Sci. Soc. Am. Proc. 39:604-613.

Ismail, S.M. 1993. Soil- wick self- regulating subsurface irrigation. Misr J. Ag. Eng., Vol. 10 ( 1 ) : 44- 52.

Ismail, S.M., T.K. Zin El-abedin, A. Wassif, and M. N. El-Nesr 2006 Drip irrigation systems in sandy soil using physical and hydraulic barriers. Misr J. Ag. Eng. 23(4):1021-1034.

Ismail, S.M., T.K. Zin El-abedin, A. Wassif, and M. N. El-Nesr 2006. Wetting pattern simulation of surface and subsurface drip irrigation systems. II- Model validation and analysis. Misr J. Ag. Eng. 23(4):1035-1057.

Ismail, S.M., T.K. Zin El-abedin, A. Wassif, and M. N. El-Nesr 2006. Wetting pattern simulation of surface and subsurface drip irrigation systems. I- Model development. Misr J. Ag. Eng. 23(3):722-746.

Ismail, S.M., T.K. Zin El-abedin and A. Abdel-Ala 2008. A simple equation to estimate the recommended emitters spacing to suit the root depth and soil texture. J. Saudi Soc. for Agric. Sci. Vol. 7, No 2; 2008 (43-57).

Ismail, S.M., T.K. Zin El-abedin, A. Omara, and E. Abdel-Tawab, 2014. Modeling the Soil Wetting Pattern under Pulse and Continuous Drip Irrigation. American-Eurasian J. Agric. & Environ. Sci., 14(9): 913-922.

Levin, I., van Royen, P.C., van Rooyen, F.C., 1979. The effect of discharge rate and intermittent water application by point-source irrigation on the soil moisture distribution pattern. Soil Sci. Sot. Am. J. 43, 8-16.

Rosenfeld B., 2000. Pulsed Ultra-low Volume Irrigation. SEIS Application Notes. 22 may 2000.26 oct 2002. <http://www.microirrigationforum.com/new/powerpoint/ English%20version/ index.htm>.

Zazueta F.S., G.A. dark, A.G. Smajstria and M. Carrillo, 1996. a Simple Equation to Estimate Soil-Water Movement from a Drip Irrigation Source. Florida Agric. Exp. Stn. Journal Series No. NR-00996.

Zin El-Abedin, T. K.; G. A. Sharaf, and S. M. Ismail. 1996. Subsurface drip line irrigation system. II. Modeling the soil-moisture distribution. Misr J. Ag. Eng., Vol.13(3) : 589-604

Zin El-Abedin. 2006. Improving moisture distribution pattern of subsurface drip irrigation in sand soil by using synthetic soil conditioner. Misr J. Ag. Eng., Vol.23 (2) : 374-398

Zur B., 1999. Wetted Soil Volume as a Design Objective in Trickle Irrigation. Irrig. Sci., Vol. 22, pp.19-30.