Table 2.

Description of field study sites.

Description	Field sites
	Abi ZARDI	Ngetta ZARDI
Latitude	3°4′37.2” N	2°16′10.8”N
Longitude	30°56′34.6″E	32°53′57.2″E
Altitude (m.a.s.l)	1,211	1,080
Agro-ecological zonea	Northwestern wooded savannah	Northern moist farmlands
Soil typeb	Sandy Clay Loam	Sandy Loam
Annual total rainfall (mm)	1,250	1,361
Mean annual temperature (°C)	24	23.4

m.a.s.l, meters above sea level.

^aWortmann and Eledu, 1999.

^bKaizzi et al., 2012.