National FFA Agronomy CDE Written Test 2018

Which of the following essential nutrients is considered a secondary nutrient?

• phosphorus

• calcium

• potassium

• manganese

• zinc

From the following list, which oral LD50 value represents the most toxic poison?

• 300 mg/kg

• 480 mg/kg

• 5000 mg/kg

• 101 mg/kg

If you wanted to increase the CEC (cation exchange capacity) of your soil, which of the following additives would you add to your soil?

• apply ammonium sulfate to the soil at least once a year

• rotate your crops annually

• add organic matter (compost, manure, green manure crops, etc.) to your soil

• moldboard plow your soil to incorporate crop residues

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:

• dioecious

• epinasty

• determinate

• monoecious

• indeterminate

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?

• N

• P

• K

• Fe

• S

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)?

• $0.27/lb

• $0.50/lb

• $0.89/lb

• $1.01/lb

• 170 bushels per acre

• 180 bushels per acre

• 200 bushels per acre

• 225 bushels per acre

Which of the following is a plant available form of nitrogen?

• N₂

• NH₃

• NO₃

• NO₂

• NO

A raceme is considered a type of what?

• tiller

• inflorescence

• root structure

• leaf structure

Which of the following plants are considered examples of pulses?

• barley, rye, rice

• white clover, alfalfa, crimson clover

• canola, flax, corn

• peas, lentils, dried beans