Along the Indus River, the water that once turned the surrounding desert into Pakistan's primary food-producing region is now causing a new challenge: soil salinization. This process occurs when salt builds up in the soil, making it less fertile and reducing its ability to support crops. In Pakistan, irrigation has been a double-edged sword. While the Indus Basin Irrigation System (IBIS) provides water to 16 million hectares of land and delivers 172 billion cubic meters of water annually, it has also led to rising groundwater levels. Over time, this has caused salt that was once deep underground to rise to the surface, clogging the soil and reducing its productivity.
The IBIS was constructed without a comprehensive drainage system, which was not considered necessary when the system was first built. Groundwater levels, which were originally 20 to 30 meters below the surface, have now risen to just 1.5 meters beneath the land in many areas. This rise has led to increased salinization, as water evaporates from the soil, leaving behind salt deposits. Each year, Pakistan loses about 40,000 hectares of arable land due to this issue, and over 5.7 million hectares have been affected in total. Punjab, which produces more than 90% of the country's food, is particularly impacted, with about 30% of its irrigated land affected by salinity.
The effects of salinization are not evenly spread across the country. In Sindh, where the land is closer to the sea, the problem is more severe, with nearly 54% of irrigated land affected. The region's low rainfall, high evaporation rates, and shallow saline groundwater contribute to the issue. The economic cost is also significant, with annual losses estimated at around $230 million and 28,000 to 40,000 hectares of land rendered unsuitable for farming.
In response, the Pakistani government has launched several projects to combat salinization, including the Salt Control and Land Reclamation Project (SCARP), which aimed to cover 8 million hectares at a cost of $2 billion. However, these efforts have had limited success due to poor maintenance and inadequate infrastructure for draining saline water. Farmers, unable to access reliable surface water, have increasingly turned to groundwater, which is often of poor quality. This practice exacerbates the salinization problem, creating a cycle that is difficult to break. As the Indus Basin continues to face increasing pressure on its water resources, finding a sustainable solution remains a major challenge for the country.
Pakistan's Indus Basin Irrigation System Contributes to Soil Salinization and Arable Land Loss
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