A Guyanese rice farmer practises crop rotation by alternating rice cultivation with legumes such as black-eye peas. Which of the following explains how this practice improves soil fertility?

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Question

A Guyanese rice farmer practises crop rotation by alternating rice cultivation with legumes such as black-eye peas. Which of the following explains how this practice improves soil fertility?

Accepted Answer

Legumes have nitrogen-fixing bacteria in their root nodules — Award 1 mark for explaining that Rhizobium bacteria in root nodules convert atmospheric nitrogen to nitrates. A is incorrect — legumes do not release pesticides. C is incorrect — water absorption is not the primary benefit. D is incorrect — weed suppression is a secondary effect, not the main fertility benefit.

Answer

Legumes release pesticides into the soil

Answer

Legumes absorb excess water from flooded fields

Answer

Legumes prevent the growth of weeds by shading

Answer

Legumes have nitrogen-fixing bacteria in their root nodules

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