A farmer started irrigating a soil some 10 years ago, but in recent years, yields have declined, and the soil's physical condition has deteriorated. Which of the following most likely accounts for this situation?
A) high gypsum content in the soil
B) high content of Ca and Mg in the irrigation water
C) failure to use conservation tillage to reduce salt accumulation at the soil surface
D) excessive drainage of the soil
E) high SAR of the irrigation water
E
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Electric currents are measured by two main units: ____
a. ohms and amps c. volts and watts b. amps and volts d. amps and watts
Design a Colpitts oscillator that will operate at 50 kHz.
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A vehicle tends to lock up the front wheels when being braked on slippery road surfaces. Technician A says that the metering valve may be defective. Technician B says the proportioning valve may be defective. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician