The growth of plants on sodic soils is constrained by all but one of the following:
A) toxicity of bicarbonate and other anions
B) oxygen deficiency due to breakdown of soil structure
C) caustic influence of high pH caused by sodium carbonate and bicarbonate
D) toxicity of very high levels of calcium carbonate
E) low micronutrient availability due to high pH
Question 2
Which of the following comparisons of the three different classes of salt-affected soils is correct?
A) Sodic soils are commonly formed by leaching saline-sodic soils.
B) Saline soils are generally higher in soluble salts than saline-sodic soils.
C) Sodic soils generally have the highest EC levels.
D) Sodic soils generally have the lowest pH.
E) The pH of saline soils is generally above 8.5.
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