Why are leguminous crops systematically included in standard Crop Rotation programs?

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A To drastically increase the moisture retention of sandy clay.
B To naturally enrich the soil with nitrogen via symbiotic Rhizobium bacteria.
C To act as a physical barrier against flying insect pests.
D To secrete acidic chemicals that dissolve tough underground rocks.

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Answer: B. To naturally enrich the soil with nitrogen via symbiotic Rhizobium bacteria.

• Answer: B
• Explanation: Leguminous plants house Rhizobium bacteria in their root nodules. These bacteria fix atmospheric nitrogen into usable forms, naturally restoring soil fertility without chemical fertilizers.

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Why are leguminous crops systematically included in standard Crop Rotation programs?

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