Agronomy Practice Test

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In order to grow, which of the following crops would need the most phosphorus?

<label class="wq_answerTxtCtr">Alfalfa - 6 dry tons per acre</label>
<label class="wq_answerTxtCtr">Wheat - grain + straw (70 bu/acre + 2 dry tons/acre)</label>
<label class="wq_answerTxtCtr">Corn - grain (120 bu/acre)</label>
<label class="wq_answerTxtCtr">Sorghum - grain (90 bu/acre)</label>
Correct! Wrong!

Correct answer:
Alfalfa - 6 dry tons per acre

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Lacustrine soils are those that have been laid down by one of these:

<label class="wq_answerTxtCtr">wind</label>
<label class="wq_answerTxtCtr">glaciers</label>
<label class="wq_answerTxtCtr">water</label>
<label class="wq_answerTxtCtr">volcanos</label>
Correct! Wrong!

Explanation:
Lacustrine soils are those that have been deposited in lake beds after having been transported by glaciers, rivers, and streams.

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What type of soil is most prone to experience nitrogen leaching?

<label class="wq_answerTxtCtr">compacted soil</label>
<label class="wq_answerTxtCtr">silty clay soil</label>
<label class="wq_answerTxtCtr">sandy soil</label>
<label class="wq_answerTxtCtr">clay soil</label>
Correct! Wrong!

Explanation:
While heavy, poorly drained soils may lose nitrogen through denitrification, sandy soils may lose nitrogen through leaching.

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Which of the following insecticides can be used on organically grown crops?

<label class="wq_answerTxtCtr">baythroid</label>
<label class="wq_answerTxtCtr">lorsban</label>
<label class="wq_answerTxtCtr">Bacillus thuringiensis</label>
<label class="wq_answerTxtCtr">none of the above</label>
Correct! Wrong!

Explanation:
The USDA and other authorities agree that many Bt varieties and products are suitable for use on organic farms. But be aware that there may still be some negative consequences. (Valium) Unlike chemical pesticides, it has no connection to cancer. In addition, following prolonged dietary exposure, it doesn't appear to have any negative consequences.

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After a preemergence application, rainfall is required to:

<label class="wq_answerTxtCtr">decrease the rate of chemical hydrolysis</label>
<label class="wq_answerTxtCtr">move the herbicide into the weed germination zone</label>
<label class="wq_answerTxtCtr">decrease the chance of herbicide movement into ground water</label>
<label class="wq_answerTxtCtr">decrease the rate of microbial activity</label>
Correct! Wrong!

Correct answer: ,br> move the herbicide into the weed germination zone

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Which of the following leaves is most crucial to grain fill in the production of rice?

<label class="wq_answerTxtCtr">all leaves are equally important</label>
<label class="wq_answerTxtCtr">leaves produced while tillering</label>
<label class="wq_answerTxtCtr">the flag leaf </label>
<label class="wq_answerTxtCtr">none of the above</label>
Correct! Wrong!

Explanation:
The flag leaf is the last to appear on rice plants, signaling the change from crop growth to grain production. This leaf is crucial for yield potential because it produces the majority of the carbohydrates required for grain filling through photosynthesis.

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An annual plant is one that:

<label class="wq_answerTxtCtr">a plant that grows, flowers and reproduces in one growing season</label>
<label class="wq_answerTxtCtr">a plant that reproduces only by vegetative parts</label>
<label class="wq_answerTxtCtr">a plant that lives more or less indefinitely, keeps coming back each year</label>
<label class="wq_answerTxtCtr">a plant that grows one year then flowers and reproduces the neck</label>
Correct! Wrong!

Correct answer:
a plant that grows, flowers and reproduces in one growing season

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Sample Agronomy Practice Questions

Try these questions from our free Agronomy practice tests. The correct answer and an explanation follow each question.

  1. What is the main form of nitrogen taken up by most crops from the soil?

    • A. Urea
    • B. Ammonium and nitrate
    • C. Organic nitrogen
    • D. Dinitrogen gas

    Answer: B. Ammonium and nitrate

    Most crops absorb nitrogen primarily as ammonium (NH4+) and nitrate (NO3-) ions from the soil solution.

  2. What is the Universal Soil Loss Equation (USLE) used to estimate?

    • A. Annual crop yield potential
    • B. Average annual soil erosion from rainfall and runoff on cropland
    • C. Irrigation water requirements
    • D. Soil organic matter accumulation rates

    Answer: B. Average annual soil erosion from rainfall and runoff on cropland

    The USLE estimates average annual soil loss (tons/acre/year) from sheet and rill erosion on cropland based on rainfall, soil erodibility, slope, and management factors.

  3. What is evapotranspiration (ET) used for in irrigation management?

    • A. Measuring rainfall totals
    • B. Estimating crop water use to schedule irrigation timing and amounts
    • C. Calculating herbicide dilution rates
    • D. Predicting frost dates

    Answer: B. Estimating crop water use to schedule irrigation timing and amounts

    ET estimates the combined water loss from soil evaporation and plant transpiration, providing the basis for scheduling irrigation to replace crop water use.

  4. Among the below, which is a commercial crop?

    • A. Bajra
    • B. Paddy
    • C. Cotton
    • D. Jowar

    Answer: C. Cotton

    Commercial crops are those grown primarily for sale in the market rather than for direct consumption by the farmer or their family. Cotton is a prime example of a commercial crop, cultivated extensively for its fiber, which serves as a crucial raw material for the textile industry. Bajra, paddy (rice), and jowar (sorghum) are typically considered food crops, though they can also be sold commercially.

Take the full Agronomy practice test

Agronomy Practice Test Questions

Prepare for the Agronomy exam with our free practice test modules. Each quiz covers key topics to help you pass on your first try.

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Agronomy: Pros and Cons

Pros

  • Agronomy credential is recognized by employers and industry professionals
  • Higher earning potential compared to non-credentialed peers
  • Expanded career opportunities and professional advancement
  • Structured learning path builds comprehensive knowledge
  • Professional development that stays current with industry standards

Cons

  • Preparation requires significant time and study commitment
  • Associated costs for exams, materials, and renewal fees
  • Continuing education needed to maintain credentials
  • Competition for advanced positions can be challenging
  • Requirements and standards may vary by state or region

Pros and Cons at a Glance

ProsCons
Agronomy credential is recognized by employers and industry professionalsPreparation requires significant time and study commitment
Higher earning potential compared to non-credentialed peersAssociated costs for exams, materials, and renewal fees
Expanded career opportunities and professional advancementContinuing education needed to maintain credentials
Structured learning path builds comprehensive knowledgeCompetition for advanced positions can be challenging
Professional development that stays current with industry standardsRequirements and standards may vary by state or region
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