Crop Residue (tons ha⁻¹)

Humic Acid (kg ha⁻¹)

Mean

1

1.5

2

2.5

5 Mungbean

0.4

0.5

0.5

0.5

0.5 a

10 Wheat Straw

0.3

0.3

0.3

0.4

0.3 c

2.5 mungbean + 5 wheat straw

0.4

0.4

0.4

0.4

0.4 b

Mean

0.37 d

0.40 c

0.42 b

0.43 a

Control

0.2 b

Rest of treatments

0.4 a