Research Article
Effect of Nitrogen Sources on Microbial Biomass Nitrogen under Different Soil Types
Table 2
Ammonium concentration, nitrogen uptake, and SDW (combined of two years) of rice cv. Giza 177 as affected by nitrogen sources and microbial biomass.
| Treatments | Clay soil | Loamy soil | TN in soil (%) | NH4 (mg kg−1) | N uptake (mg pot−1) | SDW (g pot−1) | TN in soil (%) | NH4 (mg kg−1) | N uptake (mg pot−1) | SDW (g pot−1) |
| Nitrogen sources | | | | | | | | | Zero N | 0.25 | 14.31 | 160 | 10.79 | 0.10 | 11.25 | 60 | 3.91 | Urea | 0.41 | 21.44 | 430 | 21.83 | 0.19 | 15.45 | 110 | 9.43 | Straw | 0.42 | 23.93 | 580 | 21.15 | 0.21 | 19.50 | 160 | 11.10 | Sludge | 0.43 | 22.77 | 600 | 21.55 | 0.22 | 18.72 | 220 | 12.94 | test |
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| LSD 5% | 0.02 | 0.80 | 26.4 | 0.72 | 0.03 | 1.75 | 33.5 | 3.14 | Microbial biomass | | | | | | | | | Autoclaved soil | 0.39 | 20.88 | 324 | 16.07 | 0.21 | 16.85 | 84 | 7.06 | Fresh soil | 0.43 | 20.25 | 565 | 19.52 | 0.45 | 18.05 | 143 | 7.62 | test |
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| LSD 5% | 0.04 | 0.22 | 31.3 | 0.75 | — | 0.28 | 18.1 | 0.26 |
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*Significant at , ns: not significant, and SDW: shoot dry weight of rice.
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