Abstract
The effect of two methods of molybdenum (Mo) application, banding and foliar spray, on total glycoalkaloid (TGA) and nitrate nitrogen (NO3-N) concentration of Katahdin tubers was studied and compared during each of 2 consecutive years. Sodium molybdate (Na2MoO4) was the source of Mo used. The levels of Na2MoO4 application were 0.0, 2.8 (1.25), 5.6 (2.5), and 8.4 (3.75) kg/ha (ppm soil). Banding of Na2MoO4 was carried out during the time of planting, while foliar spray was applied 13 weeks following planting when then it rate reductase activity was at its peak level. Both TGA and NO3-N were significantly (p < 0.01) reduced by all levels of Mo application and by both methods of application. Nitrate reductase activity of the leaves was significantly (p < 0.05 for banding and p < 0.01 for foliar application) increased by Mo application. Tuber Mo concentration was significantly (p < 0.01) increased at all levels of application but did not reach levels that would be toxic for human consumption. Foliar spray resulted in significantly greater decreases in TGA and NO3-N and increases in nitrate reductase activity and molybdenum concentration than banding.
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