National FFA 2013 Agronomy CDE
Written Test 2025/2026 Exam Questions
and Answers | 100% Solved
Alluvial soils - 🧠ANSWER ✔✔Soils that have been moved by water.
Nitrogen fixation - 🧠ANSWER ✔✔A process by which atmospheric nitrogen
is converted to ammonia.
Legumes - 🧠ANSWER ✔✔Plants that require rhizobium bacteria in the soil
for nitrogen fixation to occur.
Seed inoculation treatments - 🧠ANSWER ✔✔May be needed for soybean
production if soybeans have not been grown in the field before.
Pinnately compound leaves - 🧠ANSWER ✔✔An example of a plant with
this type of leaf is the puncture vine.
, Parasitic plant - 🧠ANSWER ✔✔An example of a parasitic plant is dodder.
Clay soils - 🧠ANSWER ✔✔Soils that hold water and nutrients better than
sand and are harder to till.
Soil structure - 🧠ANSWER ✔✔The way sand, silt, and clay are grouped
together.
Nutrient deficiency in clay soils - 🧠ANSWER ✔✔Clay soils would most likely
be deficient in phosphorus (P).
Surface creep - 🧠ANSWER ✔✔Erosion caused by wind.
Ligule - 🧠ANSWER ✔✔An outgrowth from the sheath at the base of the leaf
blade of grass plants, used to identify grasses.
Nitrogen recommendation - 🧠ANSWER ✔✔A soil test recommends 60
pounds of nitrogen per acre for application.
Perennial plant - 🧠ANSWER ✔✔An example of a perennial plant is alfalfa.
Tillers on wheat plant - 🧠ANSWER ✔✔The majority of tillers develop from
the crown.
Secondary nutrients - 🧠ANSWER ✔✔Calcium, magnesium, and sulfur.
Written Test 2025/2026 Exam Questions
and Answers | 100% Solved
Alluvial soils - 🧠ANSWER ✔✔Soils that have been moved by water.
Nitrogen fixation - 🧠ANSWER ✔✔A process by which atmospheric nitrogen
is converted to ammonia.
Legumes - 🧠ANSWER ✔✔Plants that require rhizobium bacteria in the soil
for nitrogen fixation to occur.
Seed inoculation treatments - 🧠ANSWER ✔✔May be needed for soybean
production if soybeans have not been grown in the field before.
Pinnately compound leaves - 🧠ANSWER ✔✔An example of a plant with
this type of leaf is the puncture vine.
, Parasitic plant - 🧠ANSWER ✔✔An example of a parasitic plant is dodder.
Clay soils - 🧠ANSWER ✔✔Soils that hold water and nutrients better than
sand and are harder to till.
Soil structure - 🧠ANSWER ✔✔The way sand, silt, and clay are grouped
together.
Nutrient deficiency in clay soils - 🧠ANSWER ✔✔Clay soils would most likely
be deficient in phosphorus (P).
Surface creep - 🧠ANSWER ✔✔Erosion caused by wind.
Ligule - 🧠ANSWER ✔✔An outgrowth from the sheath at the base of the leaf
blade of grass plants, used to identify grasses.
Nitrogen recommendation - 🧠ANSWER ✔✔A soil test recommends 60
pounds of nitrogen per acre for application.
Perennial plant - 🧠ANSWER ✔✔An example of a perennial plant is alfalfa.
Tillers on wheat plant - 🧠ANSWER ✔✔The majority of tillers develop from
the crown.
Secondary nutrients - 🧠ANSWER ✔✔Calcium, magnesium, and sulfur.
