Multiple choice

All of the following contributes to the availability of nitrogen compounds in the soil, except

  1. azotobacter

  2. thunders from clouds

  3. bacterial decay of animal refuse

  4. addition of lime
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Azotobacter fixes atmospheric nitrogen, lightning converts nitrogen into oxides, and bacterial decay releases nitrogen from organic matter. Lime (calcium carbonate) is used to neutralize soil acidity and does not provide nitrogen compounds.

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