The science behind field-scale farming, for agriculture students and new farmers: soil, plant nutrition and fertilizer math, crop physiology, irrigation, tillage and cover crops, permaculture, and farm machinery and units.
You’re reading a free preview. Sign up to see every topic and question — and to play this deck as games.
What soil is made of and how it behaves in a field: texture and the USDA particle sizes, horizons, pH and lime, cation exchange capacity and bulk density.
47 total questions
Card #1
Soil texture
Card #2
Soil structure
Card #3
Cation exchange capacity (CEC)
1. A soil test shows pH 5.2 on a field going into alfalfa, which does best near pH 6.8. What is the standard fix?
2. Two fields both test pH 5.5. Field A is a sand with 1% organic matter; field B is a clay loam with 4%. Which needs more lime to reach pH 6.5?
3. Soil A has pH 5.0 and soil B has pH 6.0. How much more hydrogen ion activity does soil A have than soil B?
1. A single natural soil aggregate, such as a crumb or a block, is called a ___.
Hint: Three letters
2. The downward removal of material from an upper horizon by water moving through the soil is called ___.
Hint: Opposite of illuviation
3. Clay and iron washed out of the E horizon build up lower down in the B horizon, a process called ___.
Hint: Deposition, not removal
