Which soil type is most prone to nutrient leaching?

• A. Clay texture with high organic matter
• B. Loamy texture with high organic matter
• C. Silt texture with high water retention
• D. Sandy texture with low organic matter

Answer: (D)

When nutrients wash out of the root zone, it’s because water moving through the soil dissolves soluble minerals and carries them downward. So the soil’s ability to hold nutrients is key, and that depends on texture and organic matter.

Sandy soils have large pore spaces, drain quickly, and store little water. They also have few sites to hold nutrients, especially if organic matter is low, so soluble nutrients are readily carried below the root zone with percolating water. That combination makes sandy soils with low organic matter the most prone to nutrient leaching.

Clay-rich soils, especially with high organic matter, have many charged sites that hold nutrients, and their finer texture reduces downward movement. Loamy soils with ample organic matter balance drainage and retention, reducing leaching risk. Soils with higher organic matter improve nutrient retention, while fine textures slow water drainage enough to limit leaching compared to sandy soils.