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.
A soil surface crust that includes nitrogen-fixing, soil-enriching cyanobacteria.
A simulated-color map of the surface of Venus as measured by synthetic aperture radar on the Magella
Blood Glucose Levels
Nursing Interventions for Different Levels of Anxiety
CaCO3 with oxygen isotopes
Major Climate Zones and Surface Currents