Potential of Cowpea Variety Mixtures to Increase Yield Stability in Subsistence Agriculture: Preliminary Results

Table 2

Soil characteristics at the three trial sites in Soroti and Kumi districts, Uganda.

Soil parameter	Unit	Trial site
		NaSARRI, Serere, Soroti district	Kikota village, Soroti district	Kogili village, Kumi district
pH		5.8	6.0	5.9
Sand	%	47	60	68
Clay	%	20	18	25
Silt	%	33	22	7
Organic matter	%	2.38	3.26	1.59
Nitrogen	%	0.18	0.11	0.09
Phosphorous (Bray 1)	mg/kg	2.45	5.72	2.85
Calcium	cmoles/kg	5.4	5.7	3.0
Magnesium	cmoles/kg	1.19	1.84	1.33
Potassium	cmoles/kg	0.29	0.37	0.34
Sodium	cmoles/kg	0.07	0.08	0.07
Copper	mg/kg	2.84	5.04	2.10
Iron	mg/kg	211.7	221.1	264.3
Zinc	mg/kg	1.20	1.74	1.74
Manganese	mg/kg	37.2	35.9	52.7

Source: soil, water, and plant analytical laboratory, Department of Soil Science, Makerere University, Kampala, Uganda.