The presence of neutral salts in an alkaline soil has a tendency to increase the pH of the soil.
Indicate whether the statement is true or false
Question 2Iron deficiency is most likely to occur under which of the following soil conditions?
A) leached humid region sandy soil limed to pH 8.0
B) well drained humid region loamy sand (Spodosol) with pH 5.0
C) silt loam Mollisol with pH 7.5
D) muck soil (Saprist) with pH 5.5
E) soil with pH 4.3 and subject to frequent flooding
Question 3Manganese toxicity is most likely to be a problem under which soil conditions?
A) clay loam Ultisol, pH 4.3, subject to frequent flooding
B) well drained calcareous soil, pH 8.1
C) poorly drained calcareous soil with pH 7.6
D) muck soil (Saprist) with pH 5.5
E) well drained humid region loamy sand, pH 5.0
Question 4Gypsum is the most widely used chemical for the reclamation of sodic soils. What characteristic likely accounts for this popularity?
A) Gypsum is quite insoluble so it remains in the soil for long periods of time.
B) Gypsum forms sulfuric acid that helps reduce the soil pH.
C) Gypsum provides sulfates that attract Na+ from the exchange complex.
D) Gypsum reacts with Na+ ions to form insoluble Na2SO4.
E) Gypsum is abundant and low priced.
Question 5In acid soils the principal chemical form of potassium available for plant uptake is ________.
A) H2KO2- B) K+ C) P- D) HKO22- E) K2O
Quick Reply
