Agricultural Lands Frequently Require Nutrient Augmentation Because ________

Agricultural lands frequently require nutrient augmentation because ________.

A) nitrogen-fixing bacteria are not as plentiful in agricultural soils because of the use of pesticides
B) nutrients within crop plants are not cycled back to the soil on lands where they are harvested
C) land that is available for agriculture tends to be nutrient-poor
D) grains raised for feeding livestock must be fortified and thus require additional nutrients
E) irrigation of agricultural land reduces oxygen availability in soils and inhibits the decomposition of organic matter

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