Turf 435 Exam 1 Questions AND Correct Answers
_______ most acid tolerant cool season turfgrass - ✔✔tall fescue
_________ most acid tolerant warm season turfgrass - ✔✔centipedgrass
A 50 lb bag of 18-2-8 contains how many lbs of K20: - ✔✔4
A good rule of thumb to follow when applying the soil lab lime recommendation to raise the soil pH of
the upper 6" of the profile in a mature, and acidic turf grass lawn is to:
broadcast lime over the top like fertilizer
invest in an acid injection system
mechanically cultivate the lawn prior to applying the lime
wait for your soil pH to raise itself
none of the above - ✔✔mechanically cultivate the lawn prior to applying the lime
A showcase St. Augustinegrass Polo Field you manage is severely thinning, so you submit a soil sample
for 'rapid chemical analysis'. They report back two items that day:
the 1:1 soil pH is 6.0, and
the soil is officially saline (ECe= 4.1 mS/cm)
Laboratory recommendations will accompany the remaining data in 1-2 days. What is the first soil
amendment you begin thinking about? - ✔✔Lime
A soil having (1:1) pHw > 7.0 is most simply classified as: - ✔✔alkaline
A soil with an 8.7 pHw(1:1), an ECe of 4.1 mS/cm, and 145 ESP would be classified by the USSL as: -
✔✔saline-sodic
a) If you wanted to lime each soil to 100% base saturation, how much pure lime would you have to apply
per 1000ft^2 to each soil?
, b) OK, lets say you did apply the proper (and exact) quantity of lime to each soil to achieve 100% base
saturation. ..... Which soil will return to 60% base saturation first, the loamy sand or the silty clay loam?
Why? - ✔✔a) LS: 1.57 lbs; SCL: 0.561 lbs
b) The silty clay loam b/c it was higher CEC, meaning it will hold more base saturation base cations
(exchangeable)
Acquisition mechanism facilitating P assimilation via mycorrhizae fungi - ✔✔Biological transport
Against-the-concentration-gradient uptake mechanism facilitated by transport by transport/carrier
proteins - ✔✔Active transport
Along-the-concentration-gradient uptake mechanism facilitated by transport by transport/carrier
proteins - ✔✔facilitated diffusion
An acidic soil with an ESP of 18%, a SAR value of 15, and an 4.8mS/cm is classified as:
sodic
normal
saline
saline-sodic
sonic, possibly saline-sonic - ✔✔saline-sodic
Besides warmth, fresh OM rich in carbon and nitrogen, adequate soil moisture, and a near-neutral pH
level, what else do microbes need to make humus: - ✔✔oxygen
If this is your soil report, what is your current base saturation? - ✔✔75% (6/8)
_______ most acid tolerant cool season turfgrass - ✔✔tall fescue
_________ most acid tolerant warm season turfgrass - ✔✔centipedgrass
A 50 lb bag of 18-2-8 contains how many lbs of K20: - ✔✔4
A good rule of thumb to follow when applying the soil lab lime recommendation to raise the soil pH of
the upper 6" of the profile in a mature, and acidic turf grass lawn is to:
broadcast lime over the top like fertilizer
invest in an acid injection system
mechanically cultivate the lawn prior to applying the lime
wait for your soil pH to raise itself
none of the above - ✔✔mechanically cultivate the lawn prior to applying the lime
A showcase St. Augustinegrass Polo Field you manage is severely thinning, so you submit a soil sample
for 'rapid chemical analysis'. They report back two items that day:
the 1:1 soil pH is 6.0, and
the soil is officially saline (ECe= 4.1 mS/cm)
Laboratory recommendations will accompany the remaining data in 1-2 days. What is the first soil
amendment you begin thinking about? - ✔✔Lime
A soil having (1:1) pHw > 7.0 is most simply classified as: - ✔✔alkaline
A soil with an 8.7 pHw(1:1), an ECe of 4.1 mS/cm, and 145 ESP would be classified by the USSL as: -
✔✔saline-sodic
a) If you wanted to lime each soil to 100% base saturation, how much pure lime would you have to apply
per 1000ft^2 to each soil?
, b) OK, lets say you did apply the proper (and exact) quantity of lime to each soil to achieve 100% base
saturation. ..... Which soil will return to 60% base saturation first, the loamy sand or the silty clay loam?
Why? - ✔✔a) LS: 1.57 lbs; SCL: 0.561 lbs
b) The silty clay loam b/c it was higher CEC, meaning it will hold more base saturation base cations
(exchangeable)
Acquisition mechanism facilitating P assimilation via mycorrhizae fungi - ✔✔Biological transport
Against-the-concentration-gradient uptake mechanism facilitated by transport by transport/carrier
proteins - ✔✔Active transport
Along-the-concentration-gradient uptake mechanism facilitated by transport by transport/carrier
proteins - ✔✔facilitated diffusion
An acidic soil with an ESP of 18%, a SAR value of 15, and an 4.8mS/cm is classified as:
sodic
normal
saline
saline-sodic
sonic, possibly saline-sonic - ✔✔saline-sodic
Besides warmth, fresh OM rich in carbon and nitrogen, adequate soil moisture, and a near-neutral pH
level, what else do microbes need to make humus: - ✔✔oxygen
If this is your soil report, what is your current base saturation? - ✔✔75% (6/8)
