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Certified Crop Advisor Exam Questions With 100% Correct Answers What is not an essential nutrient for plants? Na/sodium Which of the following plant nutrients is a cation in soils? potassium/K+ Which of the following is a macronutrient? Cu, S, Mg, B Sulfur Which element regulates stomatal openings in plants? Potassium, K Which nutrient is most immobile in soil? phosphate What is the chemical uptake form of nitrogen? NO3- What is the chemical uptake form of phosphorous? H2PO4- What is the chemical uptake form of potassium? k+ At which growth stage are nutrients in the greatest demand? vegatative Which of the following in a micronutrient? Cu, Ca, Mg, S Cu, Copper At which growth stage would you expect the highest demand for soil nutrients? mid-veg What is the least available source of nutrients? soil minerals If a nutrient is released into the soil during decomposition of an organic material what has occurred? mineralization When a plant nutrient is absorbed with