Abstract
AbstractThe use of soil color as Munsell data was explored for in situ indication of soil potassium (K) availability toward a friendly method of agricultural land survey. Soil contents of K, calcium, and magnesium were determined for 998 upland soil samples from Cote d’Ivoire (7–10°N). Soil depths (0–20, 20–60, 60–80, and 80–150 cm), redness ratio (RR), and redness factor (RF) were considered. Significant association was observed between K-levels (high, medium, and low) in topsoil and its color hue, and the highest cumulative frequency of 2.5YR in high and medium levels was characterizing the hill slope position (summit and upper slope). Deep horizon, foot slope, and yellowish color (7.5YR and 10YR) were more relevant to low K-level. Significant linear regressions of soil content of K were observed according to both redness indices indifferently to the topographic positions and soil depths in some extend. Of these finding in the line of folk knowledge, RR and RF are recommended for in situ measurement of ...
Highlights
Sustaining agriculture requires sound soil evaluation methods in concordance with morphopedology standards (Bertrand et al, 1985; Loukili et al, 2000)
Similar results account for the soil samples of 5YR (52.06% vs. 47.29%) and 10YR (53.15% vs. 46.15%) in color hues contrasting with the results observed for 7.5YR
Reddish topsoil of 2.5YR in color observed at hill slope positions (SUM and upper slope (US)) is identified as most enriched soil in K when referring to a cumulative frequency in high and medium K-levels
Summary
Sustaining agriculture requires sound soil evaluation methods in concordance with morphopedology standards (Bertrand et al, 1985; Loukili et al, 2000). Minimum data-set requirements are differing according to authors: soil attributes or both soil and plant parameters may be concerned (Larson and Pierce, 1991; Pearson et al, 1995; Pieri, 1992). The most recent approach of soil management is the fertility capability classification (FCC) system (Sanchez et al, 2003) based on five data-sets of soil as modifiers including soil content of K. This system is not popularly adopted yet. The color of soil as a component of folk classification (Krasilnikov & Tabor, 2003), may have consistent contribution as friendly prediction method of Ferralsols K availability
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