Which of the following is not an essential nutrient? N, Cu, Na, or H Correct Answer: Na Which of the following nutrients is a cation in soils? Correct Answer: Potassium What are the macronutrients Correct Answer: N, P, K, Cu, Mg, Ca, H, O, Carbon What nutrient regulates stomatal openings in plants? Correct Answer: K Which of the following plant nutrient form are mostly immobile in soil? Nitrate Sulfate Phosphate Chloride Correct Answer: Phosphate What is a chemical uptake form of nitrogen? Correct Answer: NO3- What is a chemical uptake form of Phosphorus Correct Answer: H2PO4- What is a chemical uptake form of potassium Correct Answer: K+ What are micronutrients? Correct Answer: Fe, Mn, B, Mo, Cu, Zn, Cl, Ni, Co, S, Si which plant growth stage demand the most nutrient uptake? Correct Answer: mid V-stage Chelates are commonly used to increase the availability of what? Correct Answer: Fe What is the least available source of nutrients? Correct Answer: Soil Minerals If a nutrient is released to the soil during decomposition of an organic material, what has occurred? Correct Answer: Mineralization When a plant nutrient is absorbed with water that is moving to and into the plant root, the nutrient uptake process is called ________. Correct Answer: Mass Flow A major way calcium is supplied to plants is by __________. Correct Answer: Cation Exchange Which of the following is more mobile in a flooded soil than in an upland soil Zn, Cu, Ammonium, Mn Correct Answer: Manganese What soil type has the lowest fertility Correct Answer: Sand what nutrient uptake mechanism is most important after a rainfall event? Correct Answer: Mass flow What is not needed for rapid nitrification to occur Correct Answer: Nitrate Conditions which favor volatile losses of nitrogen as ammonia include Correct Answer: High temperature denitrification is the conversion of ______ to gaseous forms like dinitrogen and oxides of nitrogen Correct Answer: nitrate A condition which favors symbiotic nitrogen fixation Correct Answer: low soil nitrate Immobilization of inorganic Nitrogen during decomposition will be likely if the material decomposing has a C:N ration of Correct Answer: 35 In what case would you expect the greatest N Mineralization Correct Answer: soil amended with biosolid