Table 3 Numbers (log cfu g−1 dry soil) of culturable microorganisms in sandy soils treated with different dosages of linuron. For each soil, means with different letter(s) are significantly different at P < 0.05. LSD Least significant difference (n = 3). TSBA Trypticase soy broth agar
From: Linuron effects on microbiological characteristics of sandy soils as determined in a pot study
Microbial group | Dosage (mg kg−1) | Loamy sand (days after application) | Sandy loam(days after application) | ||||
|---|---|---|---|---|---|---|---|
1 | 14 | 28 | 1 | 14 | 28 | ||
Total bacteria on 0.1 TSBA | 0 | 7.60 a | 7.73 b | 7.54 ad | 8.50 a | 8.68 b | 8.71 b |
4 | 7.61 a | 7.74 b | 7.53 d | 8.49 a | 8.69 b | 8.72 b | |
20 | 7.75 b | 7.83 c | 7.70 b | 8.48 a | 8.77 c | 8.70 b | |
LSD 0.03 | 400 | 7.54 a | 7.88 c | 7.74 b | 8.59 b | 8.92 d | 8.87 d |
Fungi | 0 | 4.67 a | 4.49 b | 4.57 b | 5.50 a | 5.55 a | 5.49 a |
4 | 4.68 a | 4.50 b | 4.58 b | 5.50 a | 5.56 a | 5.50 a | |
20 | 4.67 a | 4.60 b | 4.57 b | 5.52 a | 5.54 a | 5.53 a | |
LSD 0.04 | 400 | 4.49 b | 4.68 a | 4.59 b | 5.38 b | 5.64 a | 5.67 a |
N2-fixing bacteria | 0 | 4.60 a | 4.50 c | 4.62 a | 5.79 a | 5.86 d | 5.67 b |
4 | 4.55 a | 4.52 ac | 4.61 a | 5.78 a | 5.85 d | 5.69 b | |
20 | 4.52 a | 4.40 d | 4.64 a | 5.64 b | 5.87 d | 5.67 b | |
LSD 0.04 | 400 | 4.14 b | 4.34 e | 4.56 a | 5.42 c | 5.76 a | 5.68 b |
Nitrifying bacteria | 0 | 4.87 a | 4.90 a | 5.10 c | 5.38 a | 5.54 c | 5.77 d |
4 | 4.83 a | 4.91 a | 5.09 c | 5.39 a | 5.53 c | 5.78 d | |
20 | 4.80 a | 4.90 a | 5.10 c | 5.37 a | 5.55 c | 5.77 d | |
LSD 0.03 | 400 | 4.58 b | 4.66 b | 5.09 c | 5.15 b | 5.36 a | 5.78 d |
Denitrifying bacteria | 0 | 5.03 a | 4.95 a | 5.00 a | 5.86 a | 5.71 b | 5.91 a |
4 | 5.04 a | 4.96 a | 5.02 a | 5.83 a | 5.72 b | 5.93 a | |
20 | 5.10 a | 5.01 a | 5.05 a | 5.87 a | 5.73 b | 5.91 a | |
LSD 0.03 | 400 | 4.96 a | 4.95 a | 5.06 a | 5.93 a | 6.02 c | 5.93 a |