Lake Forest FFA General Knowledge Agronomy CDE

pH is the measurement of the concentration of what ion in the soil?

• hydroxide

• hydrogen

• phosphorus

• helium

Soil samples for distinctly different areas of the field should be (i.e. different soil types or hill tops vs. bottom lands):

• analyzed separately

• mixed together to represent a single production unit

• ignored as being meaningless

• mixed together for large fields and kept separate for small fields

What is the conversion of ammonium to nitrate known as?

• ammonification

• denitrification

• mineralization

• nitrification

When do broadcast applications of dry fertilizer become plant available?

• when crop residues are decomposed

• after irrigation or rainfall dissolves the fertilizer and moves into the root zone

• when is tilled 6 to 8 inches into the soil with a tillage tool

• when soil temperatures rise above 70 degrees Fahrenheit

What are national regulatory agencies regulating manure applications most concerned about?

• excessive phosphorus

• phosphorus deficiency

• excessive potassium

• potassium deficiency

When thinking of crop nutrient fertilization, what does agronomic rate of application mean?

• applying a balanced amount of nutrients

• matching fertilizer inputs with crop requirements under given soil conditions

• applying both a broadcast and starter fertilizer along with a side-dress treatment

• applying only a broadcast and starter fertilizer

What do the 4R’s of fertilizer application refer to?

• The Right price, Right brand, Right rate, Right place

• The Right source, Right rate, Right price, Right form

• The Right source, Right rate, Right time, Right place

• The Right price, Right rate, Right form, Right analysis

What is the key benefit to banding phosphorus fertilizers?

• less phosphate leaching

• a concentrated alkaline zone

• less tie up in the soil leading to better plant availability

• required for higher fertilizer rates

Visual symptoms of zinc deficiency usually appear as:

• chlorosis

• twisted stems

• pale foliage on older leaves first

• stem pitting

_________ is adsorbed as a cation and is part of the chlorophyll molecule.

• Na+

• H+

• Ca+2

• Mg+2