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THE EFFECT OF SULFAMIDE ON CORN SEEDLING GROWTH

I conducted greenhouse studies to determine if sulfamide-N could serve as an N source for plant growth. Sulfamide-N was applied to a Weld Silt Loam (mesic Aridic Paleustoll), at rates varying from 0 to 320 mg N kg-1 soil, which was planted to corn in a randomized block design. Reduced growth, bleached leaves, and leaf tip burning demonstrated that the sulfamide was toxic to corn seedlings. The nontreated sulfamide plants had nearly four times more shoot growth (dry weight): 4.03 g with no sulfamide treatment versus 1.08 g at 320 mg N kg-1 soil. Sulfamide-N treatments increased the N content of the seedlings' top tissue from 9.2 to 62 g kg-1, clearly indicating that seedlings absorbed sulfamide. Although the sulfamide is readily absorbed, apparently it is not readily used for growth. Residual effects of the sulfamide were evident when the soil was recropped. The residual sulfamide reduced the shoot growth by half and increased the N content fourfold.