Mechanisms underlying episodic nitrate and phosphorus leaching from poorly drained agricultural soils
Nathaniel C. Lawrence,
Steven J. Hall
Abstract:Poorly drained depressions within tile‐drained croplands can have disproportionate environmental and agronomic impacts, but mechanisms controlling nutrient leaching remain poorly understood. We monitored nitrate and soluble reactive phosphorus (SRP) leaching using zero‐tension soil lysimeters across a depression to upland gradient over 2 years in a corn–soybean (Zea mays L.–Glycine max [L.] Merr.) field in Iowa. We also measured stable isotopes (δ15N and δ18O) of nitrate to examine its sources and transformati… Show more
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