Table 3: Total N uptake, bacterial N uptake, and (combined of two years) in rice cv. Giza 177 as affected by nitrogen sources.

Treatments Clay soil Loamy soil TN in shoot (%) bacterial N uptake (mg pot−1) (%) TN in shoot (%) bacterial N uptake (mg pot−1) (%) Nitrogen sources Zero N 1.30 23 14.7 0.87 3.3 5.5 Urea 1.86 61 18.4 1.09 13.8 12.5 Straw 2.66 112 20.1 1.22 27.5 17.2 Sludge 2.91 125 21.5 1.52 39.0 19.5 test * * * * * * LSD 5% 0.20 14.6 1.2 0.18 11.4 1.85

*Significant at , ns: no significant, and : the proportion of plant N derived from microbial biomass.