1. Which of the following essential nutrients is considered a secondary nutrient?
a. phosphorus
b. calcium
c. potassium
d. manganese
e. zinc - b. calcium
2. From the following list, which oral LD50 value represents the most toxic poison?
a. 300 mg/kg
b. 480 mg/kg
c. 5000 mg/kg
d. 101 mg/kg - d. 101 mg/kg
3. If you wanted to increase the CEC (cation exchange capacity) of your soil, which of the following
additives would you add to your soil?
a. apply ammonium sulfate to the soil at least once a year
b. rotate your crops annually
c. add organic matter (compost, manure, green manure crops, etc.) to your soil
d. moldboard plow your soil to incorporate crop residues - c. add organic matter (compost, manure,
green manure crops, etc.) to your soil
4. If a plant continues to produce more leaves and stems after it has begun to flower, that growth habit
is called which of the following:
a. dioecious
b. epinasty
c. determinate
d. monoecious
e. indeterminate - e. indeterminate
, 5. If you were using a chlorophyll meter to determine the nutrient status of a corn crop, which nutrient
below is most likely to be correlated with the level of chlorophyll?
a. N
b. P
c. K
d. Fe
e. S - a. N
6. If a 10-25-10 fertilizer costs $450/U.S. ton (2,000 lbs in a U.S. ton), how much did you pay per pound
of all the nutrients present (round to the nearest penny)?
a. $0.27/lb
b. $0.50/lb
c. $0.89/lb
d. $1.01/lb - b. $0.50/lb
7. A farmer has all-inclusive production costs for his crop of $884 per acre. The farmer sold the crop
ahead of harvest season using a future's contract for $5.20 per bushel so how many bushels per acre
does the farmer need to achieve to cover just the production costs?
a. 170 bushels per acre
b. 180 bushels per acre
c. 200 bushels per acre
d. 225 bushels per acre - a. 170 bushels per acre
8. Which of the following is a plant available form of nitrogen?
a. N2
b. NH3
c. NO3
d. NO2
e. NO - c. NO3
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