TURF 435 UNIT 3 EXAM QUESTIONS & ANSWERS
What is generally considered a critical (deficiency threshold) tissue concentration of
potassium?
a) 0.5% b) 1% c) 1.5% d) 3% e) 4% - Answer -c
Imagine you manage a 2-acre bermudagrass sports field. If you needed to raise the
upper 6" exchangeable K soil level 75 lbs K per acre, approximately how many total lbs
KCl (0-0-60) would you have to use?
a) 150 lbs b) The soil CEC is needed to accurately determine the lbs KCl required c)
300 lbs d) 125 lbs e) 90 lbs f) 250 lbs - Answer -f
Which of the following iron fertilizers is an acidulent (lowers soil pH)?
a) Potassium sulfate b) Ferrous sulfate c) K-Mag d) Gypsum e) Epsom salt - Answer -b
An application of which of the following fertilizers delivers both Ca & S?
a) TSP (0-46-0) b) Superphosphate c) Creamy Dijon mustard d) Ammonium sulfate e)
Monopotassium phosphate - Answer -b
Which of the following traits is NOT associated with soluble K fertilizers?
a) High salt indices b) Susceptible to leaching loss c) Acid formation d) Good
compatibility in tank mixes e) None of the above - Answer -c
Compared to a 12-8-14 fertilizer, fertilizing with which of the following would require half
the material:
a) 6-2-0 b) 24-16-20 c) 6-4-7 d) 24-16-28 e) potassium nitrate - Answer -c
Adequate potassium nutrition is essential to turfgrass:
a) synthesis of chlorophyll b) water use and regulation c) canopy color d) disease
resistance e) cellular energy storage - Answer -b
Annual application of what total quantity of S generally ensures turfgrass sufficiency:
a) 1 lb ammonium sulfate / acre b) 10 lbs gypsum / M c) 125 lbs gypsum / acre d) 28
lbs potassium sulfate / acre e) all of these choices - Answer -a
What is generally considered a critical (deficiency threshold) tissue concentration of
potassium?
a) 0.5% b) 1% c) 1.5% d) 3% e) 4% - Answer -c
Imagine you manage a 2-acre bermudagrass sports field. If you needed to raise the
upper 6" exchangeable K soil level 75 lbs K per acre, approximately how many total lbs
KCl (0-0-60) would you have to use?
a) 150 lbs b) The soil CEC is needed to accurately determine the lbs KCl required c)
300 lbs d) 125 lbs e) 90 lbs f) 250 lbs - Answer -f
Which of the following iron fertilizers is an acidulent (lowers soil pH)?
a) Potassium sulfate b) Ferrous sulfate c) K-Mag d) Gypsum e) Epsom salt - Answer -b
An application of which of the following fertilizers delivers both Ca & S?
a) TSP (0-46-0) b) Superphosphate c) Creamy Dijon mustard d) Ammonium sulfate e)
Monopotassium phosphate - Answer -b
Which of the following traits is NOT associated with soluble K fertilizers?
a) High salt indices b) Susceptible to leaching loss c) Acid formation d) Good
compatibility in tank mixes e) None of the above - Answer -c
Compared to a 12-8-14 fertilizer, fertilizing with which of the following would require half
the material:
a) 6-2-0 b) 24-16-20 c) 6-4-7 d) 24-16-28 e) potassium nitrate - Answer -c
Adequate potassium nutrition is essential to turfgrass:
a) synthesis of chlorophyll b) water use and regulation c) canopy color d) disease
resistance e) cellular energy storage - Answer -b
Annual application of what total quantity of S generally ensures turfgrass sufficiency:
a) 1 lb ammonium sulfate / acre b) 10 lbs gypsum / M c) 125 lbs gypsum / acre d) 28
lbs potassium sulfate / acre e) all of these choices - Answer -a
