Symbiotic Efficiency of Native Rhizobia Nodulating Common Bean (Phaseolus vulgaris L.) in Soils of Western Kenya

Table 1

Native rhizobia population and physicochemical characteristics of soils from the study farms in Kisumu and MMUST.

Soil properties	MMUST farms				KISUMU farms
	Maize	Fallow	Bean	Napier	Bean	Maize	Fallow	Maize-bean
MPN (no. rhizobia in gm^−1 of soil)	7.8 × 10^1	1.98 × 10^2	4.102 × 10^3	3.9 × 10^1	1.25 × 10^4	3.5 × 10^4	3.2 × 10^1	1.25 × 10^4
pH (1 : 2.5 soil water ratio)	5.12	5.01	4.98	5.4	6.1	6.06	5.98	5.24
EC (dS/m)	0.3	0.7	0.7	0.4	0.2	0.2	0.4	0.4
Total (%)	0.35	0.18	0.24	0.31	0.11	0.13	0.15	0.2
Organic carbon (%)	2.6	1.58	2.66	2.8	1.32	1.15	1.78	1.39
K (cmol/kg)	1.75	0.75	0.93	1.2	1.39	1.42	1.39	1.42
Na (cmol/kg)	0.6	0.5	0.7	0.8	0.6	0.7	0.6	0.8
Mg (cmol/kg)	1.19	1.01	1.39	1.53	1.17	1.4	1.08	1.77
Ca (cmol/kg)	2.74	2.84	3.08	3.7	3.02	2.66	2.56	5.31
Al (cmol/kg)	2.8	1.9	2.6	2.5	0.6	0.7	0.6	0.9
Zn (ppm)	7.2	4.5	7.6	20	9.8	6	6.2	1.7
Cu (ppm)	5.6	5.4	5.1	5.6	1.6	1.8	1.4	1.6
Fe (ppm)	16.1	13.3	10.1	24.6	22	12.5	20.4	43.2
Mn (ppm)	72.4	43.3	75.2	91.1	38.3	48.6	32.3	94.1
P (ppm)	24	6	28	35	35	62	11.8	12
Soil texture	Clay	Clay	Clay	Clay	SL	SL	SL	SL

Note: SL: sandy loam.