Crop Residue (tons ha⁻¹)

Humic Acid (kg ha⁻¹)

Mean

1

1.5

2

2.5

5 Mungbean

6.9

7.1

7.6

8.1

7.4 a

10 Wheat Straw

6.1

6.2

6.4

6.9

6.4 c

2.5 Mungbean + 5 wheat straw

6.3

6.8

6.9

7.0

6.8 b

Mean

6.43 d

6.72 c

6.96 b

7.32 a

Control

6.0 b

Rest of treatments

6.9 a