Project #18632 - Soil science

1. Explain why the crystalline clay minerals have a negative charge.

2. Compared montmorillonite, hydrous mica, vermiculite, clorite, kaolinite, and the sesquioxides of iron and aluminum, as to:

a. Cation exchange capacity

b. relative swelling when moistened

c. relative degree of stickiness when wet

d. environmetal conditions where predominant

3. List the common exchangeable cations in a series of their approximate strength of adsorption by colloids  from strongest to weakest.

5. Why is a relatively strong concentration of KCl required to replace exchangeable  H+ with K+ on the surface of soil colloids?(consider the relative strength of adsorption of these cations).

6. Define pH with a formula and verbally.

7. what is the pH of a soil solution with an H+ ion concentration of 10-6 moles/liter? is the solution acidic, neutral, or alkaline?

8. What is the effect of soil pH on (a) the solubility of minerals: (b) microbial activity (c) and the availability of plant nutrients?

9. What is soil buffering, and how is the soil buffer capacity related to its cation exchange capacity?

10. How do liming acid soils improve their productivity?

11. Give quantitative definitions of saline and sodic soils in terms of the electrical conductivity of the satturation extract: and he sodium adsorption ratio (SAR).

12. What would be the SAR of a soil which had 30 meq/l of Na+, 6meq/l of Ca++, and 2 meq/l of Mg++ in the saturation extract? would the soil be sodic or non-sodic?

13. Explain how soil productivity is limited by: (a) soil salinity and (b) soil sodicity.

Subject Science
Due By (Pacific Time) 12/04/2013 10:00 pm
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