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Chemical and Biological Technologies in Agriculture

Table 5 Total N and C in the topsoil at the end of the 42 days incubation

From: A slow release nitrogen fertiliser produced by simultaneous granulation and superheated steam drying of urea with brown coal

Treatment

Topsoil (0–8 cm) N content (%)a

Topsoil (0–8 cm) C content (%)a

U

0.43 ± 0.01 a

1.28 ± 0.05 a

UBC-H

0.46 ± 0.01 b

1.51 ± 0.35 ab

UBC-L

0.50 ± 0.03 c

2.21 ± 0.69 bc

BC

0.03 ± 0.01 d

2.17 ± 0.14 c

Control

0.02 ± 0.01 d

1.17 ± 0.2 a

  1. Treatment abbreviations are: U urea; UBC-H urea-brown coal granule (17 % N); UBC-L urea-brown coal granule (8.7 % N); BC brown coal granule; control no N or C addition
  2. a Errors are 95 % confidence levels. Within a column, letters adjacent to values are different if the values within a column are significantly different (P < 0.05)
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