Practice Test Geeks(GAP) Good Agricultural Practices Certified Practice Test
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Soil Science & Analysis Flashcards

7 cards from real GAP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Soil Science & Analysis flashcards as text

  1. Which soil amendment is most appropriate to raise the pH of an overly acidic field soil?

    Answer: Agricultural lime (calcium carbonate)

    Agricultural lime (calcium carbonate) neutralizes soil acidity and raises pH by releasing calcium ions that displace hydrogen ions from exchange sites.

  2. What is the primary purpose of a soil percolation test in a GAP context?

    Answer: Assessing how quickly water drains through the soil profile

    A percolation test measures water drainage rate, which is critical for assessing flood risk, irrigation scheduling, and pathogen runoff potential on produce farms.

  3. Soil organic matter content directly improves all of the following EXCEPT:

    Answer: Soil particle size (texture)

    Soil texture (the proportion of sand, silt, and clay particles) is determined by geology and cannot be changed by adding organic matter.

  4. A soil bulk density reading of 1.7 g/cm³ in a crop field most likely indicates:

    Answer: Significant compaction limiting root growth and water infiltration

    Bulk density above 1.6 g/cm³ in most agricultural soils signals compaction that restricts root penetration, reduces pore space, and limits water infiltration.

  5. When should a GAP producer collect soil samples for the most accurate fertility recommendations?

    Answer: At least 2–4 weeks after fertilizer or lime application

    Sampling too soon after fertilizer or lime application gives skewed results; waiting 2–4 weeks allows amendments to equilibrate with the soil.

  6. Which practice best describes how cover crops contribute to soil health in a GAP program?

    Answer: They add organic matter and protect against erosion while improving soil biology

    Cover crops build organic matter, protect bare soil from erosion and compaction, suppress weeds, and support beneficial soil microorganism populations.

  7. In soil science, what does the term 'horizon' refer to?

    Answer: A distinct layer in the soil profile with characteristic properties

    A soil horizon is a distinct layer within the soil profile, such as the O (organic), A (topsoil), B (subsoil), and C (parent material) horizons, each with unique properties.