Fertilisers
Overview
Every harvest takes nutrients out of the soil, and unless they are put back the land slowly stops being able to feed crops. Fertilisers are the chemicals that replace those lost nutrients, and they are one of the main reasons farmers can grow enough food for a growing world population.
In this lesson you will learn that ammonium salts and nitrates are used as fertilisers, and what NPK fertilisers are: mixtures that supply the three key elements nitrogen, phosphorus and potassium for healthy plant growth. You will see why each element matters and how these fertilisers are made.
Objectives
- State that ammonium salts and nitrates are used as fertilisers.
- Describe the use of NPK fertilisers to provide the elements nitrogen, phosphorus and potassium for improved plant growth.
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Lesson Evaluation
Congratulations on completing the lesson on Fertilisers. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- Which of these is used as a nitrogen fertiliser? A. Sodium chloride B. Ammonium nitrate C. Calcium carbonate D. Copper sulfate Answer: B
- What do the letters N, P and K stand for in an NPK fertiliser? A. Nitrogen, phosphorus, potassium B. Nitrogen, potassium, krypton C. Neon, phosphorus, potassium D. Nitrate, phosphate, potassium Answer: A
- Ammonium nitrate is made by reacting ammonia with: A. Sulfuric acid B. Hydrochloric acid C. Nitric acid D. Carbonic acid Answer: C
- Which element in a fertiliser mainly promotes strong root growth? A. Nitrogen B. Phosphorus C. Potassium D. Carbon Answer: B
- Why are ammonium salts and nitrates good fertilisers? A. They are insoluble B. They supply nitrogen and dissolve in soil water C. They are acidic gases D. They remove nutrients Answer: B
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