Crop Residue (tons ha⁻¹)

Humic Acid (kg ha⁻¹)

Mean

1

1.5

2

2.5

5 Mungbean

2.5

3.3

4.0

3.3

3.3 b

10 Wheat Straw

2.2

2.6

3.7

3.0

2.9 c

2.5 mungbean + 5 wheat straw

3.0

3.2

4.8

4.1

3.8 a

Mean

2.5 d

3.0 c

4.2 a

3.5 b

Control

1.3 b

Rest of treatments

3.3 a