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Agronomy Cheat Sheet 2026

The 30 highest-yield Agronomy facts, distilled from real exam questions. Print it, save it as a PDF, or study it here ā€” free, no sign-up.

150 questions
150 min time limit
70.00% to pass
  1. What role do mycorrhizal fungi play in plant nutrition? ā†’ Extend root surface area for nutrient uptake
  2. Which crop is classified as a C3 plant? ā†’ Wheat (Triticum aestivum)
  3. The law of the minimum, attributed to Justus von Liebig, states that: ā†’ Growth is limited by the nutrient present in the least relative amount
  4. Which of the following crops may be grown without irrigation? ā†’ Millets
  5. What is the field capacity of a soil? ā†’ The soil water content after free drainage has ceased following saturation
  6. In corn production, what is the 'critical period for weed control'? ā†’ V1 to V8 growth stages when weeds compete most for resources
  7. What does 'mode of action' refer to for a herbicide? ā†’ The biochemical pathway or enzyme in the plant the herbicide disrupts
  8. Open-pollinated varieties differ from hybrid varieties primarily because they do what? ā†’ Breed true from saved seed and maintain genetic consistency
  9. The concept of 'evapotranspiration' (ET) in agronomy combines which two processes? ā†’ Soil evaporation and plant transpiration
  10. Which of the following crops can withstand draught better? ā†’ Cowpea
  11. What is the microbial process that converts organic nitrogen in soil organic matter into plant-available ammonium (NH4+)? ā†’ Ammonification
  12. Which of the following is a common method for measuring soil moisture in irrigated fields? ā†’ Tensiometer
  13. Soil salinity is measured using which instrument or method? ā†’ Electrical conductivity meter
  14. Which of the following is classified as a legume crop? ā†’ Soybean
  15. Which soil order is commonly found in the Corn Belt and is highly productive for agriculture? ā†’ Mollisol
  16. Which cultural practice is most effective at slowing the development of herbicide-resistant weed populations? ā†’ Rotating herbicide modes of action and integrating non-chemical weed control
  17. What is 'cation exchange capacity' (CEC) a measure of in soil science? ā†’ The soil's ability to retain positively charged nutrient ions
  18. What is the primary function of phosphorus in plant metabolism? ā†’ Energy transfer via ATP
  19. Which USDA zone of crop pest reporting helps agronomists track insect migration patterns? ā†’ Cooperative Agricultural Pest Survey (CAPS)
  20. What is an 'economic threshold' in pest management? ā†’ The pest density at which control action must be taken to prevent economic loss
  21. Which cover crop is most commonly used to add nitrogen back to the soil? ā†’ Hairy vetch
  22. Which environmental factor does NOT directly drive stomatal opening or closing? ā†’ Soil pH
  23. In sprinkler irrigation design, what does 'distribution uniformity' measure? ā†’ How evenly water is applied across the irrigated area
  24. What is the primary advantage of using certified seed over saved farm seed? ā†’ Guaranteed genetic purity, germination rate, and freedom from weed seeds
  25. What does the term 'quantitative trait' mean in plant genetics? ā†’ A trait controlled by many genes showing continuous variation
  26. What is the main purpose of a grassed waterway in a crop field? ā†’ Safely convey concentrated surface runoff without causing erosion
  27. What is the net ATP yield per glucose molecule during complete aerobic cellular respiration? ā†’ 36ā€“38 ATP
  28. Which tillage practice leaves at least 30% crop residue on the soil surface? ā†’ Conservation tillage
  29. Which gas is fixed by nitrogen-fixing bacteria in legume root nodules? ā†’ Atmospheric nitrogen (Nā‚‚)
  30. Potassium deficiency in crops typically first appears as what symptom? ā†’ Marginal leaf scorch on older leaves
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