Test: AP Environmental Science

1.

Phosphorus is an essential nutrient for all plants, including the ones we grow to eat. If a farmer faces the challenge of phosphorus-poor soil, what can they do to remedy the problem. 

Deep-till the soil, bringing up phosphorus-rich soil and rock fragments from the subsoil layers. 

Plant phosphorus-fixing cover crops to increase phosphorus presence in soil. 

Apply a substantial layer of chemical nitrates to the soil. 

Spread manure and then mulch to prevent leaching or erosion of nutrients. 

Move the farm elsewhere. Once phosphorus is gone, it's gone. 

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