44.8.2. Leaching Requirement Formula

Try these first

1. 1.

   What does LR stand for in irrigation?

   Hint

   Think about what is needed to manage salts.

2. 2.

   What do you measure to find out the salinity of soil?

   Hint

   It measures how well the soil can conduct electric current.

3. 3.

   What is the main purpose of calculating Leaching Requirement (LR)?

   • To enhance crop yield
   • To determine irrigation duration
   • To remove excess salts from soil

   Hint

   What issue does leaching address?

4. 4.

   True or False: Higher Electrical Conductivity (EC) indicates lower salinity in soil.

   • True
   • False

   Hint

   Reflect on what electrical conductivity measures.

5. 5.

   A farmer tests their irrigation water and finds an EC_{iw} of 2.8 dS/m and the saturation extract has an EC_{e} of 1.1 dS/m. Determine the leaching requirement and discuss the implications for irrigation practices.

   Hint

   Be sure to calculate carefully and reflect on how this impacts irrigation.

6. 6.

   If a field is neglected for several seasons regarding leaching, and a farmer notices a significant increase in soil salinity, what steps can they take to rectify the situation using LR?

   Hint

   Think about the relationship between leaching requirement and salinity management.