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Nitrogen-use efficiency of a sweetgum forest in elevated CO 2 Richard J. Norby 1 and Colleen M. Iversen 2

Figure 1: N mass in canopy and litter. canopy. litter. Figure 2: N mass in fine roots. Figure 3: N uptake. A E A E A E A E A E A E. Figure 4: N use efficiency. NUE (Mg/kg): 0.250 0. 215 0.180.

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Introduction:

Block Three. Block Two. Block One. N. N. Control. Control. N. N. Ring 6. Ring 7. 16 m. Control. Control. Control. Control. N. N. 12 m. Nitrogen-limitation and the potential for long-term effects on production and carbon storage in a CO 2 -enriched forest

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z Fixed and variable costs are adapted from Pitts et al. 2002.

Table 3. Estimated irrigation and fertilizer costs ($) for 100-acres drip irrigated tomato using a constant irrigation operating pressure (OP), and reduced OP using an adjustable pressure regulator or two preset pressure regulators. z Fixed and variable costs are adapted from Pitts et al. 2002.

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Nitrogen-use efficiency of a sweetgum forest in elevated CO 2 Richard J. Norby 1 and Colleen M. Iversen 2

Introduction:

z Fixed and variable costs are adapted from Pitts et al. 2002.