Twenty soil samples were collected from three different locations in Nigeria to study the relationship between available water, organic matter content and particle size class with the objective to develop a prediction equation for available water capacity using these soil properties. A high correlation between available water and the textural separates of the soil was obtained, the highest correlation being with silt (r = 0.96). Organic matter in these soils did not highly correlate with available water (r = 0.22). Silt was found to contribute most to the total variation in available water (95.5%). However, when clay was introduced in the regression equation, 98% of the variation in available water capacity was accounted for with a smaller standard error (1.31) than when using silt content alone (1.97). The equation: Awc = 0.93 + 0.54 silt + 0.13 clay can be used to predict the available water capacity of these soils.
Communications in Soil Science and Plant Analysis 05/1993; 24(7-8-7-8):633-640. DOI:10.1080/00103629309368829