Nutrient Management Planning Flashcards
7 cards from real CCA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Nutrient Management Planning flashcards as text
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?
Answer: Multiply Bray P1 by 1.1 to estimate Mehlich-3
Mehlich-3 P values are typically about 10% higher than Bray P1, so multiplying Bray P1 by approximately 1.1 gives a rough Mehlich-3 equivalent.
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?
Answer: A portion of legume-fixed N is credited based on legume stand quality and yield
Previous crop N credits are based on legume stand quality, yield, and decomposition rates, typically ranging from 40–200 lbs N/ac depending on crop type.
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?
Answer: Zinc
Zinc deficiency is most common in coarse-textured, low-organic-matter soils with low CEC, especially in the upper Midwest and Pacific Northwest.
Under the 4R nutrient stewardship framework, 'Right Source' refers to:
Answer: Matching the fertilizer form and grade to crop and soil needs
Right Source means selecting the correct fertilizer product—form, grade, and nutrient ratio—that matches crop requirements and soil conditions.
When calculating a phosphorus application rate using the sufficiency approach, the primary goal is to:
Answer: Apply P to achieve a specific soil test level considered adequate for maximum yield
The sufficiency approach targets maintaining soil test P at a level sufficient for maximum economic yield rather than building reserves above that threshold.
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?
Answer: Volatilization of ammonia from soil surface before incorporation
Surface-applied urea is highly susceptible to ammonia volatilization once hydrolyzed by urease, especially on high-pH or high-organic-matter soils if not incorporated by rainfall (>0.5 inch) or tillage.
Which soil pH range generally maximizes the availability of most macronutrients and micronutrients for crops grown in mineral soils?
Answer: 6.0–7.0
The pH range of 6.0–7.0 optimizes availability of N, P, K, S, Ca, Mg, and most micronutrients while minimizing toxic element availability.