12/02/2025 08:38:14
Agronomy
To which category do the crops wheat, barley, oat and rye belong?
small grain crops
What is a microscopic, slender, round worm that lives in the soil?
nematode
What is reached when a pest infestation reaches the point where the potential loss
exceeds the cost of a chemical application?
economic threshold
On which plant part do aphids feed?
plant sap
What is the most common beneficial insect species associated with crop
production?
lady beetle
What is the localized death of leaf tissue termed?
Necrosis
Which organism causes most plant diseases?
fungi
Which of the following can be detected on a crop when exposed to a black light?
aflatoxin
Which grass species is a cool season, annual and is classified as a restricted
noxious weed?
cheat
Which of the following is a prohibited noxious weed in Oklahoma?
yellow nutsedge
Bacteria from which genera form associations with legumes, to give the ability to
make use of atmospheric nitrogen?
rhizobium
Which of the following describe the process of inoculation?
applying bacteria that fix nitrogen
How can you determine if nitrogen-fixing bacteria have infected your legume crop?
nodules are present
Which of the following terms describes a herbicide application that is made after
planting and before crops and weeds emerge?
pre-emergence
What is the name of the stalk that attaches a leaf to the stem of a broad-leafed
plant?
petiole
To which category do the crops wheat, barley, oat and rye belong?
small grain crops
Peanut production in the United States increased rapidly during the early 1900's
when the boll weevil caused serious damage to which crop?
cotton
What is a microscopic, slender, round worm that lives in the soil?
nematode
Which of the following determines the rate of pesticide that is applied per acre?
effective spray width per nozzle, ground speed of the sprayer & nozzle flow rate
, 12/02/2025 08:38:14
Which of the following types of sprayer nozzles allows for the penetration of the plant
canopy and covers the underside of the leaves?
hallow cone
Where will a deficiency of any "primary plant nutrient" first appear?
lower leaves
What is the first visual symptom of a plant suffering from a deficiency of nitrogen?
chlorosis
What does the term "chlorosis" mean?
yellowing of the leaves
Which of the following is a visual sign associated with phosphorus deficiency?
purple leaves
Nitrogen, phosphorus and potassium are referred to as what type of plant nutrients?
primary
Calcium, magnesium and sulfur are referred to as what type of plant nutrients?
secondary
On a world-wide basis, what is the most limiting nutrient element for plant growth?
nitrogen
Which primary plant nutrient promotes rapid vegetative growth?
nitrogen
What is the function of phosphorus in a plant?
energy transfer
What is the symbol for the element responsible for improving stem strength?
K
Alfalfa uses large amounts of which element?
potassium
Peanut requires large amounts of which element?
calcium
Relative to wheat, canola requires more of which element?
sulfur
What is the primary material used to provide calcium to crop?
agricultural lime
Which of the following forms of agricultural lime should be used if magnesium is also
needed in the soil?
Dolomite
When should a crop producer place the seed in direct contact with fertilizer?
never
What should a crop producer do to determine how much fertilizer to apply to a field?
test the soil nutrient content
When should agricultural lime be applied?
before planting
What is likely to occur when too much fertilizer is applied to a field?
crop toxicity
What is the minimum percentage of plant food in a fertilizer is referred to as?
guaranteed analysis
Which of the following is an example of an organic fertilizer?
poultry litter
What is vegetation produced with the intent of plowing it into the soil to improve the
organic matter content termed?
green manure
How is the quality of an agricultural lime material measured?
Agronomy
To which category do the crops wheat, barley, oat and rye belong?
small grain crops
What is a microscopic, slender, round worm that lives in the soil?
nematode
What is reached when a pest infestation reaches the point where the potential loss
exceeds the cost of a chemical application?
economic threshold
On which plant part do aphids feed?
plant sap
What is the most common beneficial insect species associated with crop
production?
lady beetle
What is the localized death of leaf tissue termed?
Necrosis
Which organism causes most plant diseases?
fungi
Which of the following can be detected on a crop when exposed to a black light?
aflatoxin
Which grass species is a cool season, annual and is classified as a restricted
noxious weed?
cheat
Which of the following is a prohibited noxious weed in Oklahoma?
yellow nutsedge
Bacteria from which genera form associations with legumes, to give the ability to
make use of atmospheric nitrogen?
rhizobium
Which of the following describe the process of inoculation?
applying bacteria that fix nitrogen
How can you determine if nitrogen-fixing bacteria have infected your legume crop?
nodules are present
Which of the following terms describes a herbicide application that is made after
planting and before crops and weeds emerge?
pre-emergence
What is the name of the stalk that attaches a leaf to the stem of a broad-leafed
plant?
petiole
To which category do the crops wheat, barley, oat and rye belong?
small grain crops
Peanut production in the United States increased rapidly during the early 1900's
when the boll weevil caused serious damage to which crop?
cotton
What is a microscopic, slender, round worm that lives in the soil?
nematode
Which of the following determines the rate of pesticide that is applied per acre?
effective spray width per nozzle, ground speed of the sprayer & nozzle flow rate
, 12/02/2025 08:38:14
Which of the following types of sprayer nozzles allows for the penetration of the plant
canopy and covers the underside of the leaves?
hallow cone
Where will a deficiency of any "primary plant nutrient" first appear?
lower leaves
What is the first visual symptom of a plant suffering from a deficiency of nitrogen?
chlorosis
What does the term "chlorosis" mean?
yellowing of the leaves
Which of the following is a visual sign associated with phosphorus deficiency?
purple leaves
Nitrogen, phosphorus and potassium are referred to as what type of plant nutrients?
primary
Calcium, magnesium and sulfur are referred to as what type of plant nutrients?
secondary
On a world-wide basis, what is the most limiting nutrient element for plant growth?
nitrogen
Which primary plant nutrient promotes rapid vegetative growth?
nitrogen
What is the function of phosphorus in a plant?
energy transfer
What is the symbol for the element responsible for improving stem strength?
K
Alfalfa uses large amounts of which element?
potassium
Peanut requires large amounts of which element?
calcium
Relative to wheat, canola requires more of which element?
sulfur
What is the primary material used to provide calcium to crop?
agricultural lime
Which of the following forms of agricultural lime should be used if magnesium is also
needed in the soil?
Dolomite
When should a crop producer place the seed in direct contact with fertilizer?
never
What should a crop producer do to determine how much fertilizer to apply to a field?
test the soil nutrient content
When should agricultural lime be applied?
before planting
What is likely to occur when too much fertilizer is applied to a field?
crop toxicity
What is the minimum percentage of plant food in a fertilizer is referred to as?
guaranteed analysis
Which of the following is an example of an organic fertilizer?
poultry litter
What is vegetation produced with the intent of plowing it into the soil to improve the
organic matter content termed?
green manure
How is the quality of an agricultural lime material measured?
