DETECTION OF SOIL DESERTIFICATION IN THE NORTHERN PART OF THE DELTA USING MULTITEMPORAL PROCESSING
Taher Abd El-Haq Nada;
Abstract
The present study was carried out to evaluate soils of North Delta area which runs generally from Damietta branch in the east to Rosetta branch in the west penetrating the old cultlvatied lands in the south and stretching between longitudes
The electrical conductivity values (ECe) for soil profiles
Nos. : I , 10 , 12 , 22, 24, 27, 32, 43, and 48 were 5.52, 5.95,
5.28, 5.55, 6.73, 6.74, 7.05, 7.72 and 5.43 dS/m for the surface horizons of these profiles, respectively, which is considered as slightly saline according to soil Survey Staff, (1993). Also, the ECe values were 9.83 and 13.8 dS/m for the soil surface of profiles 50 and 51 which were moderately saline according to Soil Survey Staff , (1993), respectively. The ECe values of profiles nos. 1, 12, 19, 24, and 50 , increased with depth and reached 8.25 , 8.46 , 17.32, 6.80 and 13.39 dS/m for the subsoils Cz3, Czn, Czn3, Czn and Czn2 horizons for these profiles, respectively.This is related to leaching of salts from the soil surface with down ward movement of irrigation water.
On the other hand, data of chemical analysis showed that the electrical conductivity values (ECe) for the soil profiles Nos.
32and 51 decreased with depth , where the highest values were
7.05 and 13.8 dS/m in the surface soil; Apz horizon of both soil profiles could be classifted as moderately saline according to Soil Survey Staff, ( 1993). The accumulation of salts on soil surface layer is due to the raising capillary uppermovement of the evaporative pumping of the relatively saline ground water resulted in accumulation and mineralization of salts on the soil surface Apz horizon which also , shown by occurrence of salts in morphological description.
The electrical conductivity values (ECe) for soil profiles
Nos. : I , 10 , 12 , 22, 24, 27, 32, 43, and 48 were 5.52, 5.95,
5.28, 5.55, 6.73, 6.74, 7.05, 7.72 and 5.43 dS/m for the surface horizons of these profiles, respectively, which is considered as slightly saline according to soil Survey Staff, (1993). Also, the ECe values were 9.83 and 13.8 dS/m for the soil surface of profiles 50 and 51 which were moderately saline according to Soil Survey Staff , (1993), respectively. The ECe values of profiles nos. 1, 12, 19, 24, and 50 , increased with depth and reached 8.25 , 8.46 , 17.32, 6.80 and 13.39 dS/m for the subsoils Cz3, Czn, Czn3, Czn and Czn2 horizons for these profiles, respectively.This is related to leaching of salts from the soil surface with down ward movement of irrigation water.
On the other hand, data of chemical analysis showed that the electrical conductivity values (ECe) for the soil profiles Nos.
32and 51 decreased with depth , where the highest values were
7.05 and 13.8 dS/m in the surface soil; Apz horizon of both soil profiles could be classifted as moderately saline according to Soil Survey Staff, ( 1993). The accumulation of salts on soil surface layer is due to the raising capillary uppermovement of the evaporative pumping of the relatively saline ground water resulted in accumulation and mineralization of salts on the soil surface Apz horizon which also , shown by occurrence of salts in morphological description.
Other data
| Title | DETECTION OF SOIL DESERTIFICATION IN THE NORTHERN PART OF THE DELTA USING MULTITEMPORAL PROCESSING | Other Titles | تحديد عمليات تصحر الأراضى بشمال الدلتا باستخدام التحليلات المتتابعة | Authors | Taher Abd El-Haq Nada | Issue Date | 2001 |
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