Table 1

Variation in soil pH, organic C (%), mineral-N (μg N g-1), K2O (kg hec-1), S (ppm), Zn (ppm), Fe (ppm) and Mn (ppm) in non-Bt and Bt planted soils Stages 1. Pre-vegetation; 2. Branching; 3. Flowering; 4. Maturation and 5. Post-harvest
2010
Stages Crop pH Organic C Mineral-N K2O S Zn Fe Mn
1 non-Bt 6.3 ± 0.11 a 0.2 ± 0.12 a 8.7 ± 0.57 a 135.33 ± 7.85 a 5.45 ± 0.03 a 0.36 ± 0.03 a 4.7 ± 0.20 a 2.64 ± 0.29 a
Bt 6.3 ± 0.12 a 0.2 ± 0.13 a 8.7 ± 0.57 a 135.33 ± 7.85 a 5.45 ± 0.04 a 0.36 ± 0.03 a 4.7 ± 0.20 a 2.64 ± 0.29 a
2 non-Bt 6.86 ± 0.06 b 0.59 ± 0.06 b 14.64 ± 0.5 b 169.6 ± 4.97 b 6.10 ± 0.17 a b 0.49 ± 0.03 b 5.11 ± 0.01a 3.33 ± 0.39 b
Bt 7.03 ± 0.14 b 0.47 ± 0.15 a 15.53 ± 0.48 b 156.5 ± 3.3 b 5.8 ± 0.11 a b 0.43 ± 0.01 b 4.93 ± 0.24a 3.3 ± 0.13 b
3 non-Bt 6.8 ± 0.06 b 0.2 ± 0.16 a 16.49 ± 0.39 c 246.46 ± 2.02 c 6.35 ± 0.08 b c 0.56 ± 0.06 b 5.15 ± 0.41 a 3.5 ± 0.03 b
Bt 7.16 ± 0.31b 0.66 ± 0.17 b 17.33 ± 0.41 c 240.4 ± 2.02 c 6.01 ± 0.05 b c 0.53 ± 0.04 b 5.06 ± 0.25 a 3.47 ± 0.11 b
4 non-Bt 6.9 ± 0.06 b 0.64 ± 0.18 a 15.9 ± 0.69 c 217.33 ± 3.38 d 6.43 ± 0.26 b d 0.51 ± 0.03 b 6.12 ± 0.25 b 3.94 ± 0.01 c
Bt 7.14 ± 0.18 b 0.55 ± 0.19 b 16.94 ± 0.58 c 223.23 ± 8.3 d 6.21 ± 0.4 b d 0.46 ± 0.02 b 5.46 ± 0.08 b 4.04 ± 0.10 c
5 non-Bt 6.83 ± 0.08 b 0.4 ± 0.20 a 11.68 ± 0.54 d 141.0 ± 9.31 a 6.93 ± 0.7 c d 0.47 ± 0.20 b 4.93 ± 0.19 a 3.20 ± 0.04 b
Bt 6.96 ± 0.13 b 0.26 ± 0.21 b 11.14 ± 0.46 d 154.46 ± 10.6 a 6.97 ± 0.18 c d 0.41 ± 0.01 b 4.73 ± 0.28 a 3.24 ± 0.14 b
2011
1 non-Bt 6.45 ± 0.05 a 0.19 ± 0.02 a 8.76 ± 0.69 a 140.66 ± 3.8 a 5.0 ± 0.15 a 0.38 ± 0..01 a 4.5 ± 0.03 a 2.83 ± 0.49 a
Bt 6.45 ± 0.05 a 0.19 ± 0.02 a 8.76 ± 0.69 a 140.66 ± 3.8 a 5.0 ± 0.15 a 0.38 ± 0..01 a 4.5 ± 0.03 a 2.83 ± 0.49 a
2 non-Bt 6.73 ± 0.06 b 0.58 ± 0.05 b d 15.52 ± 0.36 b 182.33 ± 8.19 b 5.9 ± 0.15 b 0.49 ± 0.02 b 5.06 ± 0.12 a b 3.25 ± 0.16 a b
Bt 6.93 ± 0.1 b 0.54 ± 1.73 b d 14.32 ± 0.73 b 180.33 ± 11.31 b 5.66 ± 3.27 b 0.44 ± 0.02 b 4.75 ± 0.48 a b 3.4 ± 0.30 a b
3 non-Bt 6.86 ± 0.03 b 0.69 ± 0.04 c 17.04 ± 0.29 c 246.0 ± 2.03 c 6.03 ± 0.08 b c 0.52 ± 0.05 c 5.4 ± 0.15 b c 3.3 ± 0.15 a b
Bt 7.16 ± 0.31 b 0.61 ± 0.01c 16.98 ± 0.06 c 245.56 ± 2.94 c 6.0 ± 0.1 b c 0.50 ± 0.02 c 5.06 ± 0.53 b c 3.5 ± 0.26 a b
4 non-Bt 6.9 ± 0.05 b 0.64 ± 0.02 c d 15.29 ± 0.35 d 220.0 ± 15.53 c 6.5 ± 0.14 c 0.50 ± 0.03 b c 5.96 ± 0.12 c 3.81 ± 0.03 b
Bt 7.0 ± 0.25 b 0.56 ± 0.01 c d 16.58 ± 0.45 d 236.93 ± 4.00 c 6.1 ± 0.32c 0.46 ± 0.04 b c 5.56 ± 0.28 c 4.1 ± 0.55 b
5 non-Bt 6.96 ± 0.21 b 0.51 ± 0.08 b d 11.7 ± 0.27 e 146.9 ± 11.5 a 7.25 ± 0.16 d 0.46 ±0.02 b 4.7 ± 0.25 b a 3.0 ± 0.11 a
Bt 6.83 ± 0.08 b 0.27 ±1.73 b d 11.64 ± 0.52 e 152.3 ± 8.99 a 7.08 ± 0.13 d 0.4 ± 0.24 b 4.63 ±0.23 b a 3.36 ± 0.07 a

Letters a, b, c, d and some where common indicate that soil attributes do not change significantly (P < 0.05 by Tukey’s HSD test), ± indicate standard errors of the means.

Singh et al.

Singh et al. BMC Microbiology 2013 13:122   doi:10.1186/1471-2180-13-122

Open Data