Effects of Paper-Mill Sludge as a Mulch versus Topsoil Incorporation on Potassium Uptake and the Grain Yield of Rain-Fed Wheat in a High Specific Surface Loess Soil with Illite Dominance in Clay Fraction

<table>Normalized exchange isotherm following the Gapon equation for K – (Ca + Mg) exchange with K<sub>G</sub> = 16.58 (l/mole)<sup>0.5</sup>, corresponding to total electrolyte level of 0.01 normal. Ca exchange is slightly unfavorable when potassium is present except for very low concentrations.</table>

Applied and Environmental Soil Science

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Figure 1

Figure 1: Effects of Paper-Mill Sludge as a Mulch versus Topsoil Incorporation on Potassium Uptake and the Grain Yield of Rain-Fed Wheat in a High Specific Surface Loess Soil with Illite Dominance in Clay Fraction 

Figure 1 | Effects of Paper-Mill Sludge as a Mulch versus Topsoil Incorporation on Potassium Uptake and the Grain Yield of Rain-Fed Wheat in a High Specific Surface Loess Soil with Illite Dominance in Clay Fraction 