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<br />21 <br />Table 2. Nitrogen contents ($) of five major seral species and soil NO3-N <br />content (ppm) from sucrose, control, and nitrogen plots, September <br />1990. Values are means and standard deviations from a total of n <br />plants per species per treatment, collected from four blocks <br />(replicates). <br />Species Sucrose Control Nitrogen <br />Salsola iberica 0.96 + 0.13 <br />(n = 18) <br />Kochia scoDaria 1.16 ± 0.20 <br />(n = 18) <br />Aster canescens 1.29 ± 0.12 <br />(n = 18) <br />Agroovron smithii 0.86 + 0.07 <br />(n = 15) <br />Chrysothamnus nauseosus 1.57 ± 0.10 <br />(n = 18) <br />Soil NO3-N 1.57 + 0.10 <br />(n = 16) <br />1.42 ± 0.17 2.41 ± 0.46 <br />(n = 12) (n = 7) <br />1.62 ± 0.25 2.40 ± 0.20 <br />(n = 18) (n 18) <br />1.44 ± 0.10 1.61 ± 0.13 <br />(n = 17) (n = 9) <br />1.02 ± 0.09 1.32 ± 0.13 <br />(n = 14) (n = 17) <br />1.62 ± 0.12 1.52 ± 0.14 <br />(n = 18) (n = 15) <br />3.27 ± 1.24 35.25 ± 12.86 <br />(n = 16) (n = 16) <br />