Recovery and Nutrient Content of Sandblasted Soybean Seedlings1

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Abstract
Soybean [Glycine max (L.) Merr.] seedlings were exposed to a 13.4‐m/sec wind velocity and wind plus sand (<1.17 mm diameter) for 0, 5, 10, and 15 min at 6 g/cm width/min to study the effect of wind and sandblast injury on their growth and nutrient content. Soybeans can tolerate a soil loss of 6 g/cm width for 5 min without a significant (5% level) reduction in vegetative yield. Exposures to wind or wind plus sand increased the nitratenitrogen concentration 443 ppm for the 5‐min wind treatment to 1,390 ppm for the 15‐min wind plus sand treatment. Iron concentration was increased only where vegetative production was unaffected, i.e., 5‐min wind, 5‐min wind plus sand, and 10‐min wind. Other nutrient concentrations were unaffected by the treatments. Sandblast injury can change a plant's metabolic processes before there is any visual damage.

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