Alkali soil has a pH of __________.

Correct option is E

Alkali soil is characterized by a high pH level, typically greater than 8.5. Soils with a pH above 7 are considered alkaline, and when the pH exceeds 8.5, it is specifically referred to as alkali soil. The high pH in alkali soil is often attributed to the presence of basic minerals, such as carbonates and bicarbonates.