Attempts to Leach the Excess Salts from a Saline-Sodic Soil

Multiple Choice

Attempts to leach the excess salts from a saline-sodic soil resulted in a marked reduction of crop yields.To what is this most likely due?

A) deficiency of iron and manganese
B) increase in percentage sodium saturation
C) removal of Ca²⁺ and Mg²⁺ ions from the exchange complex
D) increase in the soil pH
E) increase in the Al³⁺ concentration