A farmer notices that crop yields have declined over several seasons despite adequate rainfall. Soil tests show very low nitrate levels. Which action would most directly address this problem?

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Question

A farmer notices that crop yields have declined over several seasons despite adequate rainfall. Soil tests show very low nitrate levels. Which action would most directly address this problem?

Accepted Answer

Add nitrogen-containing fertiliser to the soil — Low nitrate levels in soil limit the plant's ability to synthesise proteins and chlorophyll, reducing growth and yield. Adding nitrogen-containing fertiliser replenishes nitrates so plants can resume normal growth. Other options do not address the identified nutrient deficiency.

Answer

Add nitrogen-containing fertiliser to the soil

Answer

Plant the crops closer together to reduce competition

Answer

Spray the crops with a fungicide to prevent disease

Answer

Increase irrigation to improve water uptake by roots

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