Soil salinity

However, some on-farm surveys have been made in Egypt, [9] India, [10] and Pakistan. Figure 4: Subscriber sign in. Pedon descriptions for the soil profiles obtained from the investigated areas are summarized in Table 3.

Earth’s Soil Is Getting Too Salty for Crops to Grow

Irrigation water was generally applied for five hours every five to six days by drip irrigation. Where evapotranspiration is greater than precipitation, downward water movement is insufficient to leach solutes out of the soil profile and salts can precipitate.

Reducing the severity and extent of soil salinity is primarily a matter of soil and water management. Rao , Crop Production and soil salinity: Nielsen, and J. The subsurface was moist, which indicates excessive irrigation.

Earth’s Soil Is Getting Too Salty for Crops to Grow Science Smithsonian

The salt dynamics observed in profiles differed from farm to farm. Causes of Soil Acidification. The ECe was determined from soil saturated water extract using air-dried soil and distilled water. The salt, however, is left behind in the soil.

Preventing and managing salinity

In addition to mineral weathering, salts are also deposited via dust and precipitation. First, irrigation increases the salinity of soil water when evaporation removes water but leaves salt behind. Available micronutrients in soils under the investigated area.

Salinization can arise as the result of natural causes primary salinity or anthropogenic causes secondary salinity. When dealing with salinity it is important to keep in mind that many assets natural or built have varying levels of tolerance to increases in salinity.

Sodic soils are characterized by a poor soil structure: Causes of salinization. Leaching provided good drainage conditions. It is, therefore, best to consider efficient management methods on a site by site to maximize crop yields using a minimal input of water and fertilizer. The total cost of salt degradation, therefore, could be quite a bit higher than the most recent estimate. Surficial precipitation of white was observed in areas where plant growth was poor.

The University of Wyoming [7] and the Government of Alberta [8] report data on the salt tolerance of plants. Retrieved from " https: Rohwer, and S. Curators' Corner. This has resulted in soils with increased drainage capacity, which allows more rainfall penetrate through soils and reach the water table, causing it to rise.

Topics in soil science. Once salinization has occurred it is hard to remediate, making prevention a better strategy.