Researchers analyzed 20,000 topsoil samples to create a soil salinity map of Europe

Researchers from across Europe, including a significant contribution from Hungarian scientists at the HUN-REN Centre for Agricultural Research, have developed a detailed soil salinity map of Europe. This comprehensive map was produced after analyzing nearly 20,000 topsoil samples, providing crucial data for sustainable agricultural practices and highlighting the need for effective soil management to prevent degradation and support food security.

The initiative, part of a broader international study involving the European Commission’s Joint Research Centre and various academic institutions, aims to address the growing pressures on agricultural land due to environmental challenges such as soil degradation, climate change, and water scarcity. The study’s findings are essential for developing strategies to protect soil health and ensure sustainable food production as the global population rises.

The spatial distribution of soil salinity, now available at a resolution of 500 meters, was mapped using data from the European Union’s Land Use and Coverage Area Frame Survey (LUCAS) conducted in 2018. This data not only helps identify regions at risk of salinization but also guides farmers and agricultural consultants in selecting appropriate crop varieties and cultivation methods suited to local soil conditions.

In regions like northern and Atlantic Europe, natural processes predominantly cause salinity. In contrast, human activities such as poor irrigation practices and inadequate drainage systems are the primary causes in the Mediterranean and southern Europe. Coastal areas face additional challenges from seawater intrusion.

The study highlights that Hungarian agricultural soils are moderately saline compared to other parts of Europe. However, there is a persistent risk of secondary salinization, exacerbated by factors such as the use of saline irrigation water, improper water management, and frequent droughts leading to increased soil evaporation.

Researchers emphasize the importance of monitoring soil salinity closely due to its adverse effects on crop productivity. High salinity levels can impede water absorption by plants, reduce germination rates, and hinder nutrient uptake, ultimately diminishing crop yields and affecting soil structure and microbial activity.

The study provides several recommendations to combat these issues. These include using irrigation water with low salinity levels, optimizing irrigation schedules, and ensuring proper drainage to prevent salt accumulation. For soils already showing signs of salinization, interventions such as adding gypsum or lime can improve soil conditions by displacing sodium ions and enhancing water permeability and nutrient availability.