CCA Nutrient Management Planning 2

Question 1

A soil test reports 45 ppm Bray P1 phosphorus. Using the Mehlich-3 extraction, what conversion factor is typically applied to compare results between the two methods?

Accepted Answer

Multiply Bray P1 by 1.1 to estimate Mehlich-3

Answer

Divide Mehlich-3 by 1.1 to get Bray P1 equivalent

Answer

The two methods are directly interchangeable with no conversion

Answer

Multiply Bray P1 by 2.0 to estimate Mehlich-3

Question 2

Which of the following best describes the 'credit' given to legume nitrogen in a nutrient management plan when a non-legume crop follows in rotation?

Accepted Answer

A portion of legume-fixed N is credited based on legume stand quality and yield

Answer

The full amount of N fixed by the legume is credited to the next crop

Answer

No nitrogen credit is given because fixed N is entirely consumed by the legume

Answer

Legume N credit is only applicable in organic production systems

Question 3

A CCA is developing a nutrient management plan for a field with a CEC of 8 meq/100g. Which micronutrient deficiency is MOST likely to occur in this sandy, low-CEC soil?

Accepted Answer

Zinc

Answer

Molybdenum

Answer

Boron

Answer

Manganese

Question 4

Under the 4R nutrient stewardship framework, 'Right Source' refers to:

Accepted Answer

Matching the fertilizer form and grade to crop and soil needs

Answer

Applying nutrients from a certified supplier only

Answer

Using only organic nutrient sources to minimize environmental impact

Answer

Selecting the source with the lowest cost per unit of nutrient

Question 5

When calculating a phosphorus application rate using the sufficiency approach, the primary goal is to:

Accepted Answer

Apply P to achieve a specific soil test level considered adequate for maximum yield

Answer

Build soil P levels to the highest agronomic optimum over multiple years

Answer

Replace all P removed by the harvested crop in a single growing season

Answer

Eliminate P applications when soil tests exceed the critical level

Question 6

A farmer applies 200 lbs/ac of 46-0-0 urea to a corn field one week before a heavy rainfall event. Which nitrogen loss pathway is the PRIMARY concern?

Accepted Answer

Volatilization of ammonia from soil surface before incorporation

Answer

Denitrification of ammonium in saturated soils

Answer

Surface runoff of urea before hydrolysis can occur

Answer

Leaching of nitrate formed rapidly after hydrolysis and nitrification

Question 7

Which soil pH range generally maximizes the availability of most macronutrients and micronutrients for crops grown in mineral soils?

Accepted Answer

6.0–7.0

Answer

5.0–5.5

Answer

5.5–6.0

Answer

7.0–7.5