Effect of tile drainage on soil properties and crop yields at north of Nile Delta [electronic resource].

Includes references.

A tile drainage system was carried out in Kafr-ElSheikh, north of the Nile delta with 30 and 40 m spacing between drains and was evaluated after two years. Cumulative and rate of infiltration were estimated from field data and were calculated using the Philip's model. Measured values (over drains, 30 and 40 m between drains) were 70, 39 and 27% higher than the control. A reasonable fit was obtained between observed and calculated cumulative infiltration (I), but the prediction of infiltration rate (i) was relatively unacceptable, especially shortly after infiltration has commenced. To improve the fit of infiltration rate, an additional constant C was added to compensate the truncated terms in the Philip's equation. Introducing the additional constant C' did not change the form of the infiltration rate equation, but dramatically changed the values of sorptivity (S) and final infiltration, (A), and significantly improved the fit for both cumulative and rate of infiltration. The best fit parameter was improved by 15 % and 64.3 % of the unmodified form for I and i, respectively.

Summary in Arabic.

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