EFFECT OF SUBSURFACE DRAINAGE SYSTEM DESIGN ON THE SOIL AND WATER MANAGEMENT
Arab Universities Journal of Agricultural Sciences
A field experiment was carried out to study the effect of drain depth on the drainage water quality and flax productivity. The flax crop was planted during winter season. The field experiment was conducted at the Bahteem Research Station, Qaliubiya Governorate, from November 2015 till April 2016. Two design systems were selected, the first was conventional drainage system (CDS), with drain depth 1.5 m, the second was modified drainage system (MDS), three lateral drain lines were installed to
... ere installed to main drain directly. The depth of the lateral drain was (0.90 -1.0) m. The obtained results revealed that the salinity of the average soil profile decreased after the second irrigation onward. The soil salinity percentages of (MDS) decreased by (47, 30 and 9.5) for (2 nd , 3 rd and 4 th ) irrigation, respectively. On the cm), (28, 21 cm) after 3 rd irrigation for (L/4, L/2 distance from drain line) for both systems (MDS) and (CDS) respectively. So (MDS) produced drainage water with higher quality and lower salts concentration than the (CDS). At the end of the season the flax productivity was 3.5 ton/fed for both systems. It can be recommended to be used (MDS) with shallow drain depth.