Crop Residue (t ha⁻¹)

Humic Acid (kg ha⁻¹)

Mean

1

1.5

2

2.5

5 Mungbean

3.3

3.6

4.4

5.3

4.2 a

10 Wheat Straw

2.3

2.6

3.5

4.3

3.2 c

2^1/2 mungbean + 5 wheat straw

2.5

2.7

3.6

4.3

3.3 b

Mean

2.7 d

3.0 c

3.9 b

4.6 a

Control

1.4 b

Rest of treatments

3.5 a