What is the role of mobility potassium in plants? What is immobilization? How is nitrogen added to soil?

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Exam 4 Study Guide 1. Which crop residues would have the highest C:N ratio? 2. When crop residues are added to soil, approximately how much of the carbon as CO is2released back to the atmosphere through decomposition? 60% 3. The active organic matter fraction of the A horizon would be the lowest in yearly plowed soil. 4. With increasing depth, the C:N ratio decreases. 5. These soil conditions would result in the greatest soil organic matter given all other factors being equal. Poorly drained mollisol 6. Which of the following anions is adsorbed to soil with the greatest strength? PO 43- 7. Soil fixation of P occurs 8. This nutrient is very important for water use