Back to Basics Soil Fertility Quiz-Spring 2008

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Spring 2008

Q: A good rule of thumb for interpreting soil tests is to apply enough fertilizer to maintain the plant nutrients at that level where the supply cannot be limiting at any stage from germination to maturity.

A. True
B. False

Q: What is a common cause for delayed silking in corn?

A. Insect injury in the whorls just prior to silking
B. A shortage of potassium prior to silking
C. Delayed planting date
D A very high plant population

Q: What happens when a farm has a negative nutrients budget for many years?

A. Soil fertility levels will decline
B. Crop yields drop because of nutrient shortages
C. Soil erosion increases, less vegetation on soil
D. All of the above

Q: When evaluating a nutrient management system for long-term sustainability, which is more important?

A. Nutrient uptake
B. Nutrient removal

Q: The amount of rain you get can really affect pH! Soils formed under conditions of high annual rainfall are more ___ than are soils formed under more arid conditions.

A. Soggy
B. Acid
C. Basic

Q: Careful… this is a two-part question: In a conservation tillage system, spring soil temperatures are usually ___ compared to other tillage systems due to ____.

A. Higher; global warming.
B. Higher; the insulating effect of residue cover.
C. Lower; the insulating effect of residue cover.

Q: Now for the basics…When should you apply additional fertilizer?

A. When the crop starts showing signs of deficiency
B. When crop growth seems stunted
C. When the soil test indicates that nutrients are approaching less than adequate levels

Q: Fill in the blank. You can increase a crop's water-use efficiency by ____ if nutrient levels are high.

A. 25%
B. 66%
C. 100%
D. 200%

Q: If I can't afford to apply each recommended rate of N, P and K, I'm better off to apply at least some of each rather than focusing on just one nutrient.

A. True
B. False

Q: Despite high fertilizer costs, most farmers will be money ahead by following an efficient and effective nutrient management program. What action should such a program include?

A. Keeping soil test information current
B. Basing fertilizer decisions on each field or field area.
C. Using all available nutrient sources
D. Fertilizing for appropriate yield levels
E. Adopting nutrient management practices based on proven scientific principles
F. All of the above

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