IN THE NAME OF ALLAH, THE COMPASSIONATE, THE MERCIFUL
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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

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In the name of allah the compassionate the merciful

IN THE NAME OF ALLAH, THE COMPASSIONATE, THE MERCIFUL


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 7th


In the name of allah the compassionate the merciful

Objectives of Reclamation:

  • To increase crop yield per unit area

  • To increase WUE

  • To improve farmers’ living standard


In the name of allah the compassionate the merciful

Methods of Land Reclamation:

1: Physical Methods

  • Sub soiling

  • Deep ploughing

  • Sanding

  • Horizon mixing

  • Profile inversion


In the name of allah the compassionate the merciful

2: Biological Methods

Growing of crops on problem soils and/or their incorporation at the stage of maximum biomass productivity.


In the name of allah the compassionate the merciful

3:Chemical Methods

It includes the application of

  • Gypsum

  • Sulphur

  • Sulphuric acid

  • Hydrochloric acid etc


In the name of allah the compassionate the merciful

Prerequisites for Land Reclamation:

  • Good surface drainage

  • Leveled soils

  • Availability good quality water

  • Chemical amendments


In the name of allah the compassionate the merciful

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.


In the name of allah the compassionate the merciful

Reclamation Requirement:

It is amount of water required for reclamation, usually depends upon

  • Salts concentration

  • Soil texture

  • Soil structure

  • Trenching


In the name of allah the compassionate the merciful

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

  • Provision of source for replacement of sodium with calcium

  • Water for leaching


In the name of allah the compassionate the merciful

Sources of calcium for replacing exchangeable sodium:

  • Irrigation water

  • Gypsum and lime present in soil

  • Chemical and biological amendments

  • High-salt water


In the name of allah the compassionate the merciful

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.


In the name of allah the compassionate the merciful

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

  • The development of roots improve the permeability and infiltration capacity of soil.

  • CO2 released into the soil by roots increase solubility of CaCO3.


In the name of allah the compassionate the merciful

THANKS


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