Morphological and Genetic Diversity of Rhizobia Nodulating Cowpea (Vigna unguiculata L.) from Agricultural Soils of Lower Eastern Kenya

Table 1

Characteristics of counties in lower eastern Kenya and identities of rhizobia isolates per county.

County	Altitude (meters)	Annual temperature ranges (°C)	Annual rainfall (mm)	Soil type	No. of isolates	Isolate identities
Machakos	1000–1600	18–26	500–1300	Clay loam	15	MC1–15
Kitui	1100–1700	14–34.7	300–1050	Sand	6	KT1–5
Makueni	1000–2100	12–28	500–1300	Sandy loam	7	MK9–12, MK15, MK18, MK20

Source. Kenya Meteorological Department (http://www.meteo.go.ke).