Living Environment Regents Practice Test

What is a key reason that nitrogen fertilizers are vital for agriculture?

1. They are cheaper than other fertilizers

2. They supply essential nutrients for plant growth

3. They increase soil pollution

4. They eliminate pests naturally

The correct answer is: They supply essential nutrients for plant growth

Nitrogen fertilizers are crucial for agriculture primarily because they supply essential nutrients for plant growth. Nitrogen is one of the three macronutrients that plants require in large amounts, alongside phosphorus and potassium. It is a fundamental component of amino acids, which are the building blocks of proteins, and is also a part of nucleic acids such as DNA and RNA, which are critical for plant cell function and growth. Providing adequate nitrogen through fertilizers allows plants to develop robust foliage and enhances their overall growth and productivity. Without sufficient nitrogen, plants can exhibit stunted growth, yellowing of leaves, and reduced crop yields, ultimately impacting the food supply. While factors such as the cost of fertilizers, their environmental impact, and pest control are important considerations in agricultural practices, the primary role of nitrogen fertilizers is to ensure that plants have access to the essential nutrients they need to thrive. This nutrient supply directly influences agricultural productivity and food security.