A comparison of two methods of selenium application, banding and foliar spray, of sodium selenite (Na2SeO3) on total glycoalkaloid (TGA) and nitrate nitrogen (NO3-N) was studied during each of two consecutive years. The levels of application used were 0.0, 1.6 (0.75), 3.36 (1.5), and 5.6 (2.5) kg/ha (ppm soil). Both TGA and NO3-N were significantly reduced by application of 1.5 and 2.5 ppm of sodium selenite. Tuber selenium levels were significantly increased at all levels of application, using either banding or foliar spray, but were well below the toxic range for human consumption. Banding resulted in greater uptake of Se, and greater decreases in TGA and NO3-N as compared to foliar spray.
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