impact of farmers' organic farming practices on soil properties in ...

Table 22. DTPA-extractable manganese and copper in soils under cotton based cropping system
Code Depth (cm)
Organic <strong>farming</strong> Conventional
<strong>farming</strong>
Manganese (ppm) Copper (ppm)
% increase over
conventional
<strong>farming</strong>
Organic <strong>farming</strong> Conventional
<strong>farming</strong>
% increase over
conventional
<strong>farming</strong>
C 1 0-15 9.19 6.79 35.34 0.45 0.37 21.62
15-30 7.06 5.96 18.45 0.39 0.33 18.18
Mean 8.12 6.37 27.50 0.42 0.35 20.00
C2 0-15 8.48 6.68 26.94 0.41 0.34 20.58
15-30 6.08 4.59 32.46 0.35 0.29 20.69
Mean 7.28 5.63 29.30 0.38 0.31 22.60
C3 0-15 8.87 7.23 22.70 0.42 0.35 20.00
15-30 7.19 5.09 41.25 0.37 0.30 23.33
Mean 8.03 6.16 30.35 0.39 0.32 21.90
C4 0-15 8.31 6.41 29.64 0.50 0.39 28.20
Average <strong>of</strong>
C1 – C4
15-30 6.2 4.60 34.78 0.45 0.35 28.60
Mean 7.25 5.50 31.20 0.47 0.37 27.02
0-15 8.71 6.80 20.10 0.44 0.36 22.22
15-30 6.63 5.06 31.02 0.39 0.32 21.90
Mean 7.67 5.93 29.34 0.41 0.34 20.60