Articles

Salinity tolerance in irrigated Crops and its Control

 

Drainage is a way to reduce and control soil salinity.

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

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

Plants, when exposed to too much salt, it can be a fatal experience. But all soil contains salts, many of which are essential nutrients for plants. Salinity occurs when soluble salts (usually NaCl) are 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 move the salt down 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 to the level of salts that the plant must tolerate.

Sometimes it can increase the salinity of soils by the addition of 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 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
HIGHLY TOLERANT MODERATELY TOLERANT SENSITIVE
     Palm      Trigo      Carnation
     Barley      Tomato      Peas
     Beetroth      Oats      Beans
     Asparagus      Alfalfa      Sugar Cane
     Espinach      Rice      Pear
       Corn      Apple
       Flax      Orange
       Potato      Plum
       Carrot      Almond
       Onion      Apricot
       Cucomber      Peach
       Fig  
       Olive  
       Grape  

DRENOTUBE® contributes to a better control of soil salinization. It is a efective leaching system.