Question

why nitrogen is called a macronutrient

Answer 1

Nitrogen is a macronutrient because they are those essential elements which are present in plant in easy detectable quantities more than 1ppm of plant body.as their name macro means large suggest that these nutrients are present in large quantity so nitrogen is an element present in large quantity in plant so it is macronutrient.

More about macronutrient

They take part in synthesis of organic molecules and development of osmotic potential

Answer 2

The roots of plants fix nitrogen from the atmosphere. Since nitrogen is required in large quantities for growth of plant, it is called a macronutrient.