Q911
An alkali soil must have pH value of
A.
Less than 7.0
B.
7.0 - 7.5
C.
7.5
D.
Above 8.5
AnswerAnswer: Option D
Solution
Answer: Option D
Solution:
An alkali soil must have a pH value of above 8.5.Alkali soils are clay soils with high pH, a poor soil structure, and a low infiltration capacity. They also have a hard calcareous layer at 0.5 to 1 metre depth.
Alkali soils owe their unfavorable physio-chemical properties mainly to the dominating presence of sodium carbonate, which causes the soil to swell and is difficult to settle.