Humus is an important soil colloid. It differs from 2:1 type minerals in all but one of the ...

Humus is an important soil colloid. It differs from 2:1 type minerals in all but one of the following characteristics:

A) capable of adsorbing cations
B) influence on soil aggregate stability
C) CEC dependence on soil pH
D) structural framework of the particles
E) influence of isomorphous substitution

Question 2

Anion exchange by formation of outer sphere complexes is of least importance in the plant absorption of ________.

A) NO3- B) MoO4-2 C) H2PO4- D) SO42- E) Cl-

Question 3

What are the main disadvantages of a centrifugal pump in a power sprayer as compared to a roller pump?

What will be an ideal response?

Question 4

Some soil colloids exhibit positive charges under highly acid conditions. To what are these charges likely due?

A) the release of some OH- ions leaving an unsatisfied positive charge on the colloid
B) the adsorption of Al3+ ions on the colloid
C) protonation of some hydroxy groups by excess H+ ions
D) increase in the level of H+ ions on the exchange complex
E) substitution of lower valent atoms for higher valent atoms in the octahedral sheet

Question 5

As biotite weathers in soils, which of the following would not likely develop by mere alteration of this mineral?

A) chlorite
B) vermiculite
C) fine-grained mica
D) kaolinite
E) smectite

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Humus is an important soil colloid. It differs from 2:1 type minerals in all but one of the ...

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