Salinity tolerance in irrigated crops and its control

Drainage is a way to reduce and control soil salinity.

The accumulation excess of salts, typically pronounced the most at the soil surface, can result in salt-affected soils.

In dry regions salts may accumulate, leading to naturally saline soils.

Salt exposition can be fatal for plants, even though all soil contain salts, many of which are essential nutrients for plants. Salinity occurs when soluble salt content (usually NaCl)  is elevated in soil and water. Saline (salt-affected) soils occur mainly in arid or semi-arid areas. In these arid areas, there is often inadequate rainfall or drainage to percolate the salt through the soil so it can leach away from plant roots. In agricultural areas, the land is cleared of native vegetation (like perennial shrubs and trees with deep roots) and replaced with shallow-rooting crop plants. This causes the underground water table to rise, moving salts up to the soil surface. Irrigation water is also often saline in these areas and adds up to the level of salts that plants must tolerate.

Sometimes the salinity of soils can be increased by adding salts in irrigation water. When irrigation water evaporates, salts remain in the soil. Proper irrigation management can prevent salt accumulation by providing adequate drainage water to leach the extra added salts from the soil.

Different crops can tolerate different levels of salinity in irrigation water.

If irrigation water is saline, a leaching requirement is desirable to avoid excess accumulation of salt in the plant root zone.


Tolerance of salinity for different crops
     Palm      Wheat      Carnation
     Barley      Tomato      Peas
     Beetroot      Oats      Beans
     Asparagus      Alfalfa      Sugar Cane
     Espinach      Rice      Pear
       Corn      Apple
       Flax      Orange
       Potato      Plum
       Carrot      Almond
       Onion      Apricot
       Cucumber      Peach

drenotube® contributes to a better control of soil salinization. It is an effective leaching system.


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