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What can be the impact of excessive/inappropriate use of nitrogenous fertilizers in agriculture? 1. Proliferation of nitrogen-fixing microorganisms in soil can occur. 2. Increase in the acidity of soil can take place. 3. Leaching of nitrate to the ground-water can occur. Select the correct answer using the code given below.

What can be the impact of excessive/inappropriate use of nitrogenous fertilizers in agriculture? 1. Proliferation of nitrogen-fixing microorganisms in soil can occur. 2. Increase in the acidity of soil can take place. 3. Leaching of nitrate to the ground-water can occur. Select the correct answer using the code given below. Correct Answer 2 and 3 only

The correct answer is 2 and 3 only.

Key Points 

  • More nitrogen in the soil leads to less need for nitrogen-fixing bacteria.
  • Excessive/ inappropriate use of nitrogenous fertilizers increases the acidity of soil and Leaching of nitrate to the groundwater.
  • Fertilizers in agriculture increase inputs of nutrients to soils affecting their pH value.
  • The molecules of nitrogen change soil pH in the form of uncharged urea molecule (0), the cation ammonium (NH₄+), and the anion nitrate (NO₃-).
  • The conversion of N from one form to the other involves the generation or consumption of acidity and the uptake of urea, ammonium, or nitrate by plants will also affect the acidity of the soil 
  • These compounds deposit underground due to the leaching process.

Important Points

  • Nitrogen fixation causes free nitrogen (N2), which is a relatively inert gas, to combine chemically with other elements to form more-reactive nitrogen compounds such as ammonia, nitrates, or nitrites.
  • Nitrogen is also found in the nucleus of every living cell as one of the chemical components of DNA.

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