A farmer started irrigating a soil some 10 years ago but in recent years yields have declined and the soil physical condition has deteriorated. Which of the following most likely accounts for this situation?
A) failure to use conservation tillage to reduce salt accumulation at the soil surface
B) high SAR of the irrigation water
C) high content of Ca and Mg in the irrigation water
D) excessive drainage of the soil
E) high gypsum content in the soil
B
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The NEC is divided into an introduction and ____ chapters.
a. two b. five c. nine d. twenty
Plants require more ____________________ than any other mineral element
Fill in the blank(s) with the appropriate word(s).
Which of the following statements concerning applications or capabilities of soil moisture measuring devices is (are) true for the capacitance probe?
A) would give the same reading for both a loamy sand and a silt loam if both contained 15% moisture B) good to turn on automatic irrigation at -50 kPa C) requires "destructive sampling" for each measurement D) used to turn on irrigation when soil moisture potential reaches -200 kPa E) both A and D
Ten dollars an hour is about how much income per year?
A) $25,000 B) $35,000 C) $20,000 D) $30,000