CCA Exam Nutrient Management Questions with Correct Answers If a tobacco field is diagnosed with manganese toxicity symptoms, the best thing a farmer can do is: - Correct Answer be sure to correct the soil pH before planting his tobacco next year.Which of the following crops would be most likely to respond to potassium applications? - Correct Answer Alfalfa How does CEC influence plant availability of a nutrient present in the soil solution as a cation? - Correct Answer As CEC increases, plant availability improved.A soil has poor P availability. How will this affect the observed response to added nitrogen fertilizers?
- Correct Answer Nitrogen response will be limited by the inadequate P supplies.
In scientific language, cation exchange capacity (CEC) is expressed in milliequivalents/ 100 g soil. If a farmer's soil test says that her soil has 142 ppm of potassium, how many pounds/ acre of potassium does her soil have? - Correct Answer 284 pounds/ acre For no-till corn, why is a slightly higher rate of N fertilizer recommended? - Correct Answer because N losses to immobilization and denitrification are higher in no-till systems.Which element can be taken up by plants as either an anion or a cation? - Correct Answer Nitrogen The form in which nitrogen exists at the start of its mineralization process is: - Correct Answer as part of soil organic matter Which of the following elements is NOT essential for plant growth? - Correct Answer Silicon At which stage should you take samples for plant analysis of corn? - Correct Answer one-half of plants beginning to silk Aluminum toxicity is most likely to be a problem when: - Correct Answer soil pH is very low.For which agricultural chemical phase would layers of clothing be advised? - Correct Answer Solid 1 / 2
Potassium can be fixed on soll clays is chree different positions: edge, internal, and para.Which position is most likely to be released to soil solution? - Correct Answer Para Which type of clay mineral would have the highest P retention? - Correct Answer Amorphous clay You see tobacco plants that are dark green, severely stunted, and have yellow flecks in lower leaves.What is the likely culprit? - Correct Answer inadequate soil phosphorus Which of the following nitrogen forms would cause the largest drop in soil pH? - Correct Answer Anhydrous ammonia What factors cause ammonium in the soil to be mineralized to nitrate? - Correct Answer A pair of soil bacteria is responsible for this reaction.The scenatio under which banded starter fertilizer is most likely to benefit corn is: - Correct Answer no-till, early planted, low soil test
The most common uptake form of potassium is as: - Correct Answer K+
What is the main reason for doing plant analysis? - Correct Answer to accurately diagnose nutrient deficiencies.Which of the following statements are true about sulfur in Kentucky soils? - Correct Answer Our soils receive about 10 to 15 pounds/acre of S in rainfall every year.What potassium form must tobacco growers avoid? - Correct Answer Potassium chloride If you are deciding how much P and K to apply to winter wheat, and you plan to double crop soybean the following summer, how should you decide how much P and K to apply? - Correct Answer Use the P recommendation for wheat, but use the K recommendation for soybean.How does soil pH affect P availability? - Correct Answer P is most available to plants at a pH of about
6.5.
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