Saline soils are characterized by:

Saline soils are characterized by:
 
  A) high CaCO3 levels near the soil surface.
  B) pH values of less than 8.5.
  C) electrical conductivity of standard saturated paste of less than 4 dS/m.
  D) low chloride and sulfate contents.
  E) sodium adsorption ratios of 13 or higher.

Question 2

If soil test results for P are available, the optimum amount of P fertilizer to apply to a crop can be best recommended by:
 
  A) calculating the amount of P needed to bring the ratios of soil test P to N, P to K, and P to Mg into balance with the proper ratio for the type of soil in question.
  B) comparing the cost of P fertilizer to the yield responses measured in the past when P was applied to similar soils with similar soil test P levels.
  C) subtracting the available soil test P from the total P uptake for the desired yield goal.
  D) subtracting the soil test P level measured from the soil test P level considered to be on the border of high and very high.
  E) These days, all four of the above are done, in order, by a computer program.

Question 3

Many years of research have confirmed that the quadratic (parabolic curve) model is the best method of making fertilizer recommendations based on response curves, especially if environmental quality is a high priority.
 
  Indicate whether the statement is true or false

Question 4

The cation exchange capacities of alkaline soils are generally higher than those of acid soils (Vertisols excepted). Which of the following characteristics of alkaline soils most likely accounts for this high CEC?
 
  A) high exchangeable calcium
  B) high content of 2:1 type clays
  C) high exchangeable sodium content
  D) high humus content
  E) high content of hydrous oxides of iron and aluminum

Question 5

Normal alkaline soils are characterized by all but which one of the following?
 
  A) low levels of available manganese
  B) low levels of available boron
  C) high levels of exchangeable sodium
  D) high levels of molybdenum
  E) low levels of available iron

Question 6

Fertilization to supply the nutrient element potassium is often accomplished by which type of application?
 
  A) injection of a gas into the soil
  B) broadcast of a chloride salt
  C) broadcast of the nearly pure element as a solid
  D) incorporation of powdered limestone rock
  E) application of a chelate to the soil

Question 7

Land application of treated sewage sludge is an effective means of recycling nutrients back to the soil from which they were originally taken.
 
  Indicate whether the statement is true or false

Question 8

If you wanted to quickly increase the pH of a soil to 7.5 to combat a disease in cabbages you are about to plant, you should use hydrated lime rather than ground limestone.
 
  Indicate whether the statement is true or false