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Table 2 Molar C:N:P ratios in soil and microbial biomass

From: C:N:P stoichiometry and nutrient limitation of the soil microbial biomass in a grazed grassland site under experimental P limitation or excess

  C:N C:P N:P
Total soil pools    
0_0 12.19 (0.26) 301.9 (17.39) 24.62 (1.34)
0_30 12.23 (0.59) 244.7 (29.88) 20.01 (1.72)
15_5 11.97 (0.2) 197.0 (18.35) 16.45 (1.7)
15_15 12.04 (0.23) 204.4 (23.55) 16.97 (1.72)
30_0 11.92 (0.31) 210.1 (11.85) 17.65 (0.79)
30_30 11.88 (0.16) 156.0 (12.91) 13.10 (1.21)
Mean 12.05 (0.35) 219.0 (49.97) 18.13 (3.84)
Microbial biomass    
0_0 8.59 (1.16) 45.57 (6.19) 5.30 (0.86)
0_30 8.15 (1.36) 34.58 (1.94) 4.36 (0.79)
15_5 6.98 (0.82) 36.25 (3.01) 5.27 (0.82)
15_15 7.31 (0.76) 34.99 (3.18) 4.81 (0.47)
30_0 7.37 (0.78) 34.24 (3.15) 4.66 (0.23)
30_30 7.70 (1.28) 29.07 (4.7) 3.80 (0.47)
Mean 7.68 (1.15) 35.77 (6.22) 4.69 (0.82)
  1. Molar element ratios in a long-term P-fertilisation trial. Soils received 0, 15 or 30 kg P ha−1 since 1968 (0_, 15_, 30_) and 0, 5, 15 or 30 kg P ha−1 since 1999 (_0, _5, _15, _30). See text for details. Data are means, n = 6, with standard error in parentheses.