EVERYDAY SCIENCE

Detailed explanation-1: -1 Answer. Over-irrigation actually can increase soil salinity due to the transport of dissolved salts.

Detailed explanation-2: -After irrigation, the water added to the soil is used by the crop or evaporates directly from the moist soil. The salt, however, is left behind in the soil. If not removed, it accumulates in the soil; this process is called salinization (see Fig. 102).

Detailed explanation-3: -Over-irrigation leads to water loss, increases energy use for pumping, causes leaching of nitrogen and other micro nutrients, and wastes time. Crop nitrogen needs, fertilizer costs, and nitrogen losses to groundwater also result from over-irrigation.

Detailed explanation-4: -The most influential human-induced factors are land use, farming systems, land management and land degradation. Inappropriate irrigation practices (such as the use of salt-rich irrigation water) and insufficient drainage both cause salinisation.

Detailed explanation-5: -Which type of irrigation causes soil salinization? Flood irrigation causes soil salinization at higher rates than other types of irrigation.