Crop Residue (t ha⁻¹)

Humic Acid (kg ha⁻¹)

Mean

1

1.5

2

2.5

5 Mungbean

4.3

5.3

6.9

5.4

5.5 a

10 Wheat Straw

2.5

3.7

4.3

3.9

3.6 c

2.5 mungbean + 5 wheat straw

2.8

4.0

4.4

4.3

3.9 b

Mean

3.2 d

4.3 c

5.2 a

4.6 b

Control

1.9 b

Rest of treatments

4.3 a