Table 2 Relative abundance of different carbon types (%) as determined by the 13C RMN by CP/TOSS techniques for HA and PHA.

From: Combining humic acid with phosphate fertilizer affects humic acid structure and its stimulating efficacy on the growth and nutrient uptake of maize seedlings

C Type ppm

CAlk-H,R 0−45

CAlk-O,N 45−60

CAlk-O 60−91

CAlk-di-O 91−110

CAr-H,R 110−142

CAr-O 142−156

CCOO-H,R 156−186

CC=O 186−230

HA

1.95

0.19

3.40

2.86

58.79

8.05

20.61

4.16

PHA

2.06

0.27

3.26

2.78

58.16

8.16

20.86

4.45

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