SOME BIOLOGICAL ACTIVITIES UNDER TILE DRAINAGE COMPARED TO SURFACE DRAINAGE | ||
| Journal of Soil Sciences and Agricultural Engineering | ||
| Article 2, Volume 28, Issue 10, October 2003, Pages 7447-7454 PDF (2.21 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jssae.2003.245308 | ||
| Authors | ||
| M. N. A. Omar,1; R. A. Ali2; M. E. Abo-Waly2; A. A. S. Gendy1 | ||
| 1Soils, Water and Environment Res. Inst., ARC, Giza, Egypt' | ||
| 2Faculty of Agriculture, Kafr EI-Sheikh, Tanta Univ., Egypt. | ||
| Abstract | ||
| Agricultural lands in upper Egypt had been brought under perennial irrigation after the construction of Aswan High Dam (1960-1968). The natural drainage system that had sustained permanent agriculture for millennium could no longer cope with increased percolation from irrigation, and large areas had become waterlogged and salinized. An area of 2.21 million feddans in the Nile Delta was provided with tile drainage at the end of 1998. Fifteen soil profiles were chosen from five regions of alluvial soils. They mainly differed i n t he age 0 f implemented tile drainage network at EI-Minofiya and Kafr EI-Sheikh Governorates, representing both middle and north Delta soils. In each region, three profiles were selected where the first the profile is surface drainage, the second is beside the lateral and the third profile is located just in the midway between. The relation between the microbiological activities (total bacterial counts, dehydrogenase and nitrogenase activities) and the prevailed drainage conditions had been studied. The results showed that the biological activity has been pronounced in the old tile drainage specially the total bacterial count. In the newly tile drainage (Sid i- Salim region I) and (Sidi-Salim region II), the bacterial count in the surface drainage soil was higher than that of the tile drainage. The high values of dehydrogenase activity were recorded in Mahalat Alkassab region profile 3P2 (beside the lateral). The nitrogenase activity mostly decreased with increasing soil depth. Total nitrogen in soil profiles, decreased gradually with depth. The highest value of total nitrogen (0.53%) was found in profile 1P2. | ||
| Keywords | ||
| Soil profiles depth; tile drainage systems. and biological activities | ||
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