Calculate the leaching requirement to prevent the build-up of salts in the upper 45 cm of a soil if the ECdw of the drainage water is 6 dS/m and the ECiw of the irrigation water is 1.2 dS/m What are...

Calculate the leaching requirement to prevent the build-up of salts in the upper 45 cm of a soil if the ECdw of the drainage water is 6 dS/m and the ECiw of the irrigation water is 1.2 dS/m

What are the advantages of using gypsum (CaSO4 · 2H2O) in the reclamation of a sodic soil? Show the chemical reactions that take place.