A farmer in Guyana notices that his rice fields produce lower yields each year despite using the same amount of fertilizer. Soil tests reveal that the topsoil layer has decreased significantly. Which conservation practice would BEST help restore soil fertility on this farm?

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Question

A farmer in Guyana notices that his rice fields produce lower yields each year despite using the same amount of fertilizer. Soil tests reveal that the topsoil layer has decreased significantly. Which conservation practice would BEST help restore soil fertility on this farm?

Accepted Answer

Practising crop rotation with nitrogen-fixing legumes — Award 1 mark for identifying crop rotation as a soil conservation method that restores nitrogen naturally. A is incorrect — increasing chemical fertilizers does not address the loss of topsoil structure. C is incorrect — removing vegetation exposes soil to erosion. D is incorrect — slash and burn destroys soil organic matter and accelerates degradation.

Answer

Practising crop rotation with nitrogen-fixing legumes

Answer

Removing all vegetation from the field between planting seasons

Answer

Using slash and burn techniques

Answer

Increasing the use of chemical fertilizers

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