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← GeographyWhich horizon-related outcome happens downstream when excessive irrigation coincides with agricultural nitrogen application?
A)Increased subsoil clay mineral concentration
B)Enhanced organic matter decomposition rates
C)Elevated nitrate level in groundwater✓
D)Decreased topsoil cation-exchange capacity
💡 Explanation
Elevated nitrate in groundwater happens because irrigation and nitrogen application enhances leaching, whereby percolation carries soluble nitrates into the aquifer. This impacts groundwater quality, rather than necessarily altering soil composition near the surface because the mechanism occurs downwards.
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