Agronomy Crop Production and Management 2 — Questions and Answers
Question 1: What is the primary purpose of crop rotation in agronomic systems?
- Increase machinery efficiency
- Break pest and disease cycles and improve soil health (Correct answer)
- Reduce labor requirements
- Simplify harvest scheduling
Correct answer: Break pest and disease cycles and improve soil health
Rotating crops disrupts the life cycles of pathogens, insects, and weeds that are host-specific, while diversifying soil nutrient demands.
Question 2: Which soybean growth stage is most critical for final yield determination?
- V3 (vegetative)
- R1 (flowering)
- R3 (beginning pod)
- R5 (beginning seed fill) (Correct answer)
Correct answer: R5 (beginning seed fill)
The R5 stage (beginning seed fill) is most critical because seed size and number are being determined, directly setting final yield.
Question 3: What does the term 'vernalization' mean in crop production?
- Irrigation scheduling
- Cold temperature requirement for flowering (Correct answer)
- Fertilizer placement method
- Harvest timing adjustment
Correct answer: Cold temperature requirement for flowering
Vernalization is the process by which certain crops require exposure to extended cold temperatures before they can flower and set seed.
Question 4: Which nutrient is most commonly applied as starter fertilizer placed near the seed at planting?
- Potassium
- Sulfur
- Phosphorus (Correct answer)
- Calcium
Correct answer: Phosphorus
Phosphorus starter fertilizer placed near the seed promotes early root development and seedling vigor, especially in cold soils.
Question 5: The harvest index (HI) of a crop is defined as what?
- Total biomass per acre
- Ratio of grain yield to total above-ground biomass (Correct answer)
- Number of harvestable seeds per plant
- Moisture content at harvest
Correct answer: Ratio of grain yield to total above-ground biomass
Harvest index is the proportion of total above-ground dry matter that is in the economically valuable grain portion.
Question 6: Which practice helps reduce lodging in small grain crops such as wheat?
- Increasing seeding rate
- Applying plant growth regulators (Correct answer)
- Avoiding all nitrogen fertilizer
- Deep irrigation
Correct answer: Applying plant growth regulators
Plant growth regulators (PGRs) shorten and strengthen straw internodes, reducing the risk of lodging in wheat and other small grains.
Agronomy Crop Production and Management 2
What is the primary purpose of crop rotation in agronomic systems?