Agronomy MCQ Flashcards
7 cards from real Agronomy practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Agronomy MCQ flashcards as text
Which tillage practice leaves at least 30% crop residue on the soil surface?
Answer: Conservation tillage
Conservation tillage is defined by the USDA as any system leaving at least 30% residue cover, reducing erosion and improving soil health.
The law of the minimum, attributed to Justus von Liebig, states that:
Answer: Growth is limited by the nutrient present in the least relative amount
Liebig's Law of the Minimum states that plant growth is constrained by the single most limiting nutrient, regardless of other nutrient levels.
Which soil pH range is generally considered optimal for most agronomic crops?
Answer: 6.0–7.0
Most agronomic crops grow best between pH 6.0 and 7.0, where nutrient availability is maximized and toxic elements are minimized.
What is the primary function of phosphorus in plant metabolism?
Answer: Energy transfer via ATP
Phosphorus is a key component of ATP (adenosine triphosphate), which drives energy transfer in virtually all metabolic processes.
A field with a soil compaction layer (hardpan) would most likely benefit from which practice?
Answer: Subsoil tillage (deep ripping)
Subsoil tillage or deep ripping mechanically breaks up compaction layers, improving root penetration, drainage, and aeration.
Which physiological process in plants is most directly affected by nitrogen deficiency?
Answer: Protein synthesis and chlorophyll production
Nitrogen is a building block of amino acids, proteins, and chlorophyll, so its deficiency causes stunted growth and characteristic yellowing (chlorosis).
Which crop is classified as a C3 plant?
Answer: Wheat (Triticum aestivum)
Wheat uses the C3 photosynthetic pathway, fixing CO₂ directly via RuBisCO without a prior carbon-concentration step.