Soil Salinity in Irrigated Punjab, Pakistan: Drivers, Impacts on Agricultural Productivity, and Integrated Management Strategies

Abstract

Soil salinity and sodicity are major land-degradation challenges affecting the sustainability of irrigated agriculture in Punjab, Pakistan. The region's semi-arid climate, high evaporative demand, dependence on irrigation, variable groundwater quality, inadequate drainage, and long-term salt accumulation create conditions that can impair soil productivity and crop performance. Salinity reduces plant water uptake through osmotic stress and may cause ion toxicity and nutrient imbalances, whereas sodicity deteriorates soil structure, infiltration, and hydraulic conductivity through excessive exchangeable sodium. These problems frequently coexist, complicating the management of salt-affected soils. This review synthesizes research on the major causes, agricultural consequences, and amelioration strategies relevant to Punjab's irrigated farming systems. Particular attention is given to canal–groundwater conjunctive use, irrigation-water quality assessment, drainage and leaching, gypsum application, organic amendments, salt-tolerant crops, improved fertilizer management, and emerging biological approaches. Research conducted in Punjab demonstrates that combining chemical amendments with organic materials and appropriate water management can improve soil conditions and support rice–wheat production on salt-affected land. Nevertheless, the success of reclamation depends on soil texture, salinity and sodicity severity, groundwater depth, water quality, drainage capacity, and farmers' access to inputs and technical advice. The review advocates a site-specific, integrated management framework supported by regular soil and irrigation-water testing, targeted reclamation, salt-tolerant cropping systems, and long-term monitoring. Coordinated action among researchers, extension services, irrigation agencies, and farmers is essential to reduce salt accumulation, restore degraded land, and strengthen agricultural sustainability and food security in Punjab.