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
*
*
*
*
*
*
*
*
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
*
*
*
*
*
*
*
*
LSD 5%
0.04
0.22
31.3
0.75
—
0.28
18.1
0.26
*Significant at , ns: not significant, and SDW: shoot dry weight of rice.