Evaluate the effects of primary and secondary macronutrients on plant growth and development.

Evaluation should include identifying primary and secondary macronutrients and listing their effects on plant growth and development. 

Process/Skill Questions:

• Which three primary macronutrients are essential for plant growth?
• Why is N-P-K expressed as a ratio in fertilizer?
• What are the symptoms of various nutrient deficiencies?
• How can one treat a nutrient deficiency?
• What secondary macronutrients are essential for plant growth?