IN THE NAME OF ALLAH, THE COMPASSIONATE, THE MERCIFUL. Reclamation of Salt Affected Soils by Rizwan Zahoor 2004-ag-1537 B.Sc. (Hons) Agri. Agronomy 7 th. Objectives of Reclamation: To increase crop yield per unit area To increase WUE
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IN THE NAME OF ALLAH, THE COMPASSIONATE, THE MERCIFUL
Reclamation of Salt Affected Soils
B.Sc. (Hons) Agri.
Objectives of Reclamation:
Methods of Land Reclamation:
1: Physical Methods
2: Biological Methods
Growing of crops on problem soils and/or their incorporation at the stage of maximum biomass productivity.
It includes the application of
Prerequisites for Land Reclamation:
Reclamation of Saline Soils:
Reclamation of saline soil is done by applying excess water to the soil surface. The removal of salts may be accomplished either by continuous ponding of water on soil surface or by intermittent leaching.
It is amount of water required for reclamation, usually depends upon
Reclamation of sodic and saline-sodic soil:
Reclamation of sodic and saline-sodic soil is more difficult, time consuming and expensive than that of saline soil. It involves not only leaching a soluble salts but also the replacement of exchangeable sodium with calcium and the improvement of physical properties of soil. The two most difficult aspects of the reclamation process are
Sources of calcium for replacing exchangeable sodium:
Replacing exchangeable sodium:
CaCO3is insoluble in water. However, the presence of lime is important in sodic and saline-sodic soil, if it is treated with acids or sulphur, it provides calcium.
when vegetation is established, CO2 released and converts the CaCO3 into relatively soluble Ca(HCO3)2.
Crop During Reclamation:
Some kind of vegetation should be grown during reclamation, as they help reclamation and also provide some income to farmers.
Growth of crop helps reclamation in two ways