Kentucky CCA Study Guide (2022/2023) Rated A+

Kentucky CCA Study Guide (2022/2023) Rated A+ If a tobacco field is diagnosed with manganese toxicity symptoms, the best thing a farmer can do is: 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? a) tobacco b) soybean c) corn d) alfalfa alfalfa How does CEC influence plant availability of a nutrient present in the soil solution as a cation? As CEC increases, plant availability improved A soil has poor P availability. How will this affect the observed response to added nitrogen fertilizers? 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? 284 pounds/acre For no-till corn, why is a slightly higher rate of N fertilizer recommended? 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? nitrogen The form in which nitrogen exists at the start of its mineralization process is: as part of soil organic matter Which of the following elements is NOT essential for plant growth? a) copper b) iron c) molybdenum d) silicon e) potassium. silicon At which stage should you take samples for plant analysis of corn? one-half of plants beginning to silk Aluminum toxicity is most likely to be a problem when: soil pH is very low For which agricultural chemical phase would layers of clothing be advised? a) liquid b) solid c) gas d) all three phases require this protection. b) solid Potassium can be fixed on soil clays in three different positions: edge, internal, and para. Which position is most likely to be released to soil solution? para Which type of clay mineral would have the highest P retention? a) amorphous clays b) oxides c) 1:1 clays d) 2:1 clays. amorphous clays You see tobacco plants that are dark green, severely stunted, and have yellow flecks in lower leaves. What is the likely culprit? inadequate soil phosphorus Which of the following nitrogen forms would cause the largest drop in soil pH? a) anhydrous ammonia b) ammonium nitrate c) ammonium sulfate d) calcium nitrate anhydrous ammonia What factors cause ammonium in the soil to be mineralized to nitrate? A pair of soil bacteria is responsible for this reaction The scenario under which banded starter fertilizer is most likely to benefit corn is: no-till, early planted, low soil test The most common uptake form of potassium is as K+ What is the main reason for doing plant analysis? to accurately diagnose nutrient deficiencies. Which of the following statements are true about sulfur in Kentucky soils? Our soils receive about 10 to 15 pounds/acre of S in rainfall every year What potassium form must tobacco growers avoid? 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? Use the P recommendation for wheat, but use the K recommendation for soybean. How does soil pH affect P availability?