CCA Crop Management 2

Question 1

Which tillage practice leaves at least 30% crop residue on the soil surface after planting?

Accepted Answer

Conservation tillage

Answer

Conservation tillage is defined by leaving 30% or more crop residue on the surface to reduce erosion and improve soil health.

Question 2

A corn field shows interveinal chlorosis on older leaves first. Which nutrient deficiency is most likely?

Accepted Answer

Magnesium

Answer

Magnesium is mobile in the plant, so deficiency symptoms appear on older (lower) leaves first as an interveinal chlorosis.

Question 3

What is the primary purpose of a cover crop termination window before cash crop planting?

Accepted Answer

Allow residue decomposition and reduce allelopathy risk

Answer

Terminating cover crops 2–4 weeks before planting allows residue to begin decomposing and reduces allelopathic compounds that can inhibit cash crop germination.

Question 4

Which growth stage is the most critical period for water stress in corn yield determination?

Accepted Answer

VT/R1 (tasseling/silking)

Answer

Water stress during VT/R1 (tasseling and silking) causes the greatest yield loss because pollination and kernel set are directly impaired.

Question 5

A farmer wants to reduce soybean cyst nematode (SCN) populations. Which practice is most effective long-term?

Accepted Answer

Plant SCN-resistant varieties in rotation with non-host crops

Answer

Rotating SCN-resistant varieties with non-host crops (e.g., corn) is the most sustainable and cost-effective long-term management strategy.

(CCA) Certified Crop Advisor Practice Test

(CCA) Certified Crop Advisor Practice Test

CCA Crop Management 2