Title page for ETD etd-08012012-040534

Type of Document Master's Thesis
Author Budisantoso, Soeprapto
URN etd-08012012-040534
Title Moisture distribution in soil irrigated with a line source subsurface trickle irrigation system
Degree Master of Science
Department Agricultural Engineering
Advisory Committee
Advisor Name Title
Ross, Burton Blake Committee Chair
Mostaghimi, Saied Committee Member
Perumpral, John V. Committee Member
Powell, Norris L. Committee Member
Wright, F. Scott Committee Member
  • Fertilizers
Date of Defense 1989-04-15
Availability restricted
Soil moisture distribution resulting from a line source subsurface trickle irrigation system

was studied on bare and cropped layered soils. The soil type was an Uchee loamy sand.

The Continuous System Modeling Program (CSMP) Model was used to simulate the soil

moisture distribution resulting from the linesource. The model was modified and developed in

FORTRAN programming language. The modification included the effects of layered soil, source

position, number of sources, soil evaporation and plant transpiration. The model was also used to

simulate daily and one-in-several-days irrigations.

Field and laboratory experiments were conducted to determine the soil moisture retention

curve, the hydraulic conductivity, and soil moisture distribution from the line source. This data was

used for model verification with the lateral lines buried 13 inches below the soil surface and spaced

36 and 72 inches apart. Simulated and measured soil moisture distributions were in good agreement.

Simulated moisture distribution indicated that the wetting front expansion is more a function

of irrigation volume than irrigation rate. However, the irrigation rate does affect the soil moisture

distribution. A higher rate will result in a larger quantity of horizontal water movement. The simulation also indicated that a one-in-ten days irrigation causes more horizontal movement than a

daily irrigation.

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