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.
Saline Groundwater in the United States
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Base Levels
(a) Graph for converting values to p values. (b) Table of values for selected values of df