Abstract
The condition of surveyed area was described in previous paper (part 1), in which 38 different experimental sites (with different physical and chemical characteristics) were treated for soil desalinization and land reclamation survey. In part 2, data obtained concerning soil salinity were treated statistically.
The summary of the detailed studies is as follows;
(1) Most of the salts in the survey area were sulfates and chlorides of calcium, magnesium and sodium with a high degree of solubility which could be leached out easily.
(2) Low soil intake-rate, very shallow-shallow ground water-table, and/or the heaviness of the second soil layer or their combination effect were restricting factors for soil pH decreasing. But the presence of calcium and gypsum in the soil acted to prevent efficient increase in the alkalinity.
(3) Using the Shavour river's water for leaching, however, the soil texture was very heavy. But in the project, desalinization and reclamation of saline and saline-alkaline soils could be done successfully.
(4) Lowering the saline ground-water table by means of a drainage system and improvement. of soil intake-rate might be helpful to decrease the soil pH.
(5) Chemical amendment application and leaching may improve both physical and chemical characteristics of the soil if the ground-water table is controlled below 1.5 meters.
(6) The changes of salinity and alkalinity were different with depth of percolated water. In this case an optimum practical depth of leaching water should be found and applied.
These will be the indications of our next papers.
