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.
B
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____________________ can be defined as the rate at which tasks are produced, especially the output per unit of labor.
Fill in the blank(s) with the appropriate word(s).
The mathematical representation of the satisfaction a consumer derives from a bundle of goods is called the
A) Demand curve. B) Indifference curve. C) Utility function. D) Engel curve.
When a motor design is tested by the manufacturer, it is loaded to the full-load horsepower using the motor’s rated frequency and voltage, and the measured current becomes the nameplate ____ for that motor.
a. HLA b. FLA c. FLP d. NEC
Which type of duct system has the longest life expectancy?
A. galvanized metal B. fiberglass-wrapped, spiral duct (flexible duct) C. fiberglass, fiberboard sheeting D. round sheet metal