Salinisation Flashcards
1
Q
How much salt is toxic to most plants
A
3000-6000ppm
2
Q
What promotes salinisation
A
Excessive water application as salt remains once evaporated and groundwater within 3m of surface as water rises by capillary action and evaporates
3
Q
What areas are affected by salinisation
A
10-20% global farmland, San Joaquin Valley California
4
Q
How to treat salinisation
A
Can treat by flushing with water but causes salinisation of water and impossible if crust too thick as runs off
5
Q
Example of treating salinisation
A
Lower Colorado river valley: flushed but water downstream too salty for Mexican farmers, USA had to build a desalinisation plant
