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Explanation:

Fertilizers are substances that are added to soil or plants to provide essential nutrients that are necessary for plant growth and development. Here are some examples of fertilizers:

1. Nitrogen-based fertilizers: These fertilizers are rich in nitrogen, which is essential for the growth of leaves and stems. Examples include ammonium nitrate, urea, and ammonium sulfate.

2. Phosphorus-based fertilizers: These fertilizers contain phosphorus, which promotes root development, flowering, and fruiting. Examples include superphosphate, triple superphosphate, and diammonium phosphate.

3. Potassium-based fertilizers: These fertilizers provide potassium, which helps with overall plant health, disease resistance, and fruit quality. Examples include potassium chloride, potassium sulfate, and potassium nitrate.

4. Compound fertilizers: These fertilizers contain a combination of nitrogen, phosphorus, and potassium in varying ratios. They are often labeled with an NPK value, indicating the percentage of each nutrient. For example, a 10-10-10 fertilizer contains 10% nitrogen, 10% phosphorus, and 10% potassium.

Now, let's move on to your second question:

NPK fertilizer refers to a type of compound fertilizer that contains three primary nutrients: nitrogen (N), phosphorus (P), and potassium (K). These three elements are vital for plant growth and are often required in larger quantities than other essential nutrients.

The NPK ratio indicates the relative amounts of these nutrients in the fertilizer. For instance, a fertilizer with an NPK ratio of 10-5-5 means it contains 10% nitrogen, 5% phosphorus, and 5% potassium. Different plants have varying nutrient requirements, so the appropriate NPK ratio will depend on the specific crop or plant being grown.

NPK fertilizers are commonly used in agriculture and gardening to replenish soil nutrients and support healthy plant growth. By providing a balanced combination of nitrogen, phosphorus, and potassium, NPK fertilizers help improve crop yield, enhance plant vigor, and prevent nutrient deficiencies.

Verified answer

Answer:

1.A fertilizer is a chemical substance that contains necessary nutrients such as nitrogen, potassium, and phosphorous to make the soil fertile. Popular examples of fertilizers are urea, potash, and ammonium sulphate.

Advantages of fertilizers

They are quick in providing plant nutrients and restoring soil fertility.

They are portable and easy to transport.

Plants easily absorb fertilizers.

Fertilizers improve and increase the productivity of many crops such as wheat, maize, and rice.

However, these are chemicals, and they have the potential to decrease the fertility of soil if used constantly. Furthermore, it also pollutes water bodies.

Manures and fertilizers, both are added to increase soil fertility and enhance the growth of plants but are distinct in some way or the other. The major difference between manures and fertilizers

2.NPK (nitrogen, phosphorus, and potassium) are the main ingredients in most fertilizers. The letters NPK stand for the three major nutrients that plants need to live and grow – nitrogen, phosphorus, and potassium. Plants need other nutrients like iron, calcium, and even chlorine, but N, P, and K are the big three

Explanation:

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