Nicotine concentration in the different leaf stalk positions of a maturing flue-cured tobacco (NC 82) as affected by nitrogen and water stress.
1988
Javier E.P.
At 55 days after transplanting (DAT) and earlier, the upper leaves of the well watered plants had slightly higher nicotine concentration than the lower leaves. At 60 DAT content was the same for all leaves throughout the stalk position while at 65 DAT to harvesting, the higher leaves had higher nicotine than the lower leaves. From 35 to 65 DAT, the lower leaves of the stressed plants had higher nicotine concentration than the upper leaves. At harvest, however, the upper leaves had higher nicotine concentration than the lower or older leaves. Nicotine concentration was low (0.73%) in well-watered and unfertilized plant. It increased to 2.69% under severe stress condition (-8 bar) regardless of nitrogen level. Nicotine content of well watered and moderately stressed plants was higher (2 to 4.43%) in the upper than in the lower leaves regardless of nitrogen level. The middle leaves (leaf 4-9) of the fertilized and severely stress plants (-8 bar) have higher nicotine concentration (2.8 to 3.7%) than the upper or lower leaves. Nicotine concentration was inversely related to reducing sugars, starch, proline, dry matter accumulation but positively and directly related to leaf total N.
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