A farmer grows a different crop in a field each year for three years.
In the fourth year the farmer plants a leguminous crop and then ploughs this into the soil. The next year the rotation starts again.
Which microorganisms will increase by the time the rotation starts again?
1 denitrifying bacteria
2 nitrifying bacteria
3 nitrogen-fixing bacteria
4 decomposing bacteria
1 )
1, 2 and 3
2 )
1, 2 and 4
3 )
1, 3 and 4
2, 3 and 4
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