Relationships between Soil Texture and Water Contents: A Tool for Estimating Soil Moisture Conditions under Irrigation Agriculture

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Date
2012
Authors
Kahiga,P.
Muya,E.M.
Thuranira,E.G.
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Abstract
The numerical relationships between soil water content at different suctions and soil texture were investigated by regressing soil water content at 0.05 bars and 15 bars suctions against clay, silt, and sand percentage. These relationships were investigated, based on 123 secondary data sets, collected from six different countries (Kenya, Sweden, France, Spain, Romania and United States of America). The regression analysis was carried out using SSPS computer software version 10. The relationship between % sand and water content (We) was found to be significant at sanction 0.05 bars (P<0.010), while at 15 bars it was insignificant. No significant relationship was observed for silt at both suctions. The clay fraction showed the highest correlation with water content (R2=>0.60) with significant relationships at both 0.05 and 15 bars (P«O.Ol). Based on these relationships, it was found that soil textural classes with known proportional distribution of different particle size groups may be used along with the empirical model developed to estimate the soil water holding capacity, with clay being the most reliable in variable (P<O.Ol).
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East African Agricultural And Forestry Journal, 78 (No 4), p. 227-234