Effect of Nitrogen Sources on Microbial Biomass Nitrogen under Different Soil Types

Table 3

Total N uptake, bacterial N uptake, and 𝑃_fix (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)	𝑃fix (%)	TN in shoot (%)	bacterial N uptake (mg pot^−1)	𝑃fix (%)
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
𝐹 test	*	*	*	*	*	*
LSD 5%	0.20	14.6	1.2	0.18	11.4	1.85

*Significant at 𝑃<0.05, ns: no significant, and 𝑃_fix: the proportion of plant N derived from microbial biomass.