Nitrogen immobilization values

In percentage of dry weight of wood. To obtain nitrogen immobilization values per ton of wood, multiply percentage figures by 2,000. This gives values of about S-25 lb. N for the various woods. 

Tracer studies conducted in flooded soils by Broadbent and Nakashima (1970) showed that immobilization values were intermediate between those obtained under aerobic and anaerobic conditions. Rice straw containing 0.47% nitrogen immobilized an additional... 

CNcrit, included in the calculation of critical nitrogen leaching, Ni(crit), values, the input of this endpoint parameter into the uncertainty of CL(N) is expressed in a lesser degree. Furthermore, the runoff processes are practically not significant for ecosystems of Luvic Phaeozems, Chernozems and Kashtanozems due to low P PE ratio. During the calculations of CL(N) for ecosystems of North East Asia, the values of critical immobilization and denitrification from N depositions as the endpoints both in relative and absolute meanings played a subordinate role that obviously reflects their minor contribution into uncertainty and sensitivity analysis of the computed output values of ecosystem sensitivity to acidic deposition. 

Mixed crystals of type II have been used in the form of thin films on electrodes as well as in the form of chemically synthesized powders immobilized on electrodes. Depending on the radii of the ions involved in the synthesis, solid solutions can also be formed as single phases. In the case of K CuCo[Fe(CN)(5] films, XRD results indicated that a single phase with a cubic face-centered symmetry was formed [31]. The situation is more complex in the case of K NiPd[Fe(CN)6] deposited as a thin film on electrodes [32]. Kulesza etal. have pointed out that there is a critical concentration of Pd + below which Pd + was taken as the countercation at interstitial position, while above that value a solid solution is formed in which both Ni " " and Pd + are nitrogen coordinated. 

Characteristics of the ESR spectra of phaeomelanins are quite different and deserve some comment. The usual spectrum is composed of a triplet with g = 2.0052, a value typical of immobilized radicals with hyperfine splitting due to nitrogen (1 = 1). Accurate measurements were accomplished on synthetic cysteinyldopa melanins (382) at various pH in DiO... 

Lehman and Blum (1997) found that the mean C/N ratios of cover crop residues were 51, 32, 15, and 12 for rye, wheat, crimson clover and subterranean clover, respectively. The C/N ratios of the soils, however, were not significantly modified in 1993 (only year determined). The values ranged from 9 to 19 with a mean of 13.5 0.13 (Blum et al. 1997). Both Iritani and Arnold (1960) and Hannsen and Van Schreven (1955) have suggested that a C/N ratio of 20 is the approximate threshold between mineralization and immobilization of N in soil by nucroorgan-isms. The mean value of 13.5 for these soils suggests that in most instances the soils in 1993 were probably not nitrogen limited. 

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