Ompact density (gcm Particle compositionAverage value ) Clay (,0.002 mm, ) Sand (20.05 mm, ) Silt (0.050.002 mm, ) 1.54 16.eight 61.7 21.four four.0 25.0 49.0 19.Mineral compositionSmectite ( ) Vermienlite ( ) Intergrade mineral hydromica (1.four nm, ) Kaolinite ( )Cations compositionexchangeable Ca (mmolkg)35.4 18.1 two.0 49.exchangeable Mg (mmolkg21) exchangeable Na (mmolkg21) FeO (noncrystalline iron extracted with Tamm’s answer, gkg21) doi:10.1371/journal.pone.0076712.tPLOS 1 | www.plosone.orgStatus Alterations of Soil PotassiumFigure 1. Workflow of evaluating status modifications of soil potassium from Path Model. doi:10.1371/journal.pone.0076712.gResults Path analysis of watersoluble potassium (wsK)For purpose of path analysis of watersoluble potassium, direct and indirect effect components with the path evaluation had been derived from a number of linear regressions coefficients of wsK, and correlation coefficients between soil properties. Direct coefficient variables of wsK include things like neK, eK, PHA, SOM, S, Na and Na/K; whilePLOS One particular | www.plosone.orgindirect coefficient variables of wsK contain CIA, Na, Mg, CO3 and pH. Effect element of path size of watersoluble potassium was determined by pH, CIA, Oxidation Reduction Potential (ORP), S, Na (Fig. three and Table 8). Within the path model of wsK, direct effects of soil properties around the normalized worth of wsK (ZwsK) were represented by singleheaded arrows, even though coefficients between soil properties were represented by doubleheaded arrows.Chroman-7-amine Order Direct and indirect effects have been indicated by value and marked with “6”.Status Adjustments of Soil PotassiumFigure 2. Diagram of experimental design and style to evaluate status alterations of soil potassium. doi:ten.1371/journal.pone.0076712.gTable 2. Total contents of soil elements of Laboratory measurement for different parameters of 256 soil samples (R, rhizosphere soil; NR, nonrhizosphere).Sample NR116 R1732 NR3348 R4964 N6580 R8196 NR97112 R113128 NR129144 R145160 NR161176 R177192 NR193208 R209224 NR225240 R241Na 0.3-Bromopyridazine site 44 0.PMID:23357584 45 0.44 0.44 0.44 0.47 0.44 0.44 0.44 0.45 0.43 0.45 0.44 0.45 0.44 0.Mg 0.39 0.37 0.39 0.39 0.39 0.42 0.38 0.38 0.39 0.39 0.38 0.38 0.39 0.38 0.38 0.Al 6.49 6.53 six.5 six.51 six.46 six.three six.49 6.53 6.38 6.39 six.49 6.51 six.43 six.43 six.46 6.Si 36.86 37.16 36.92 36.94 36.93 36.38 37.04 37.09 36.84 36.94 37.09 37.01 36.92 37.08 37 37.Fe three.35 three.34 three.33 3.34 3.32 three.29 3.35 three.35 3.29 three.27 three.32 three.33 three.31 3.32 three.31 three.Mg 1.49 1.49 1.49 1.49 1.47 1.46 1.48 1.48 1.48 1.47 1.49 1.48 1.47 1.46 1.47 1.Ca 0.37 0.39 0.38 0.39 0.36 0.4 0.37 0.four 0.36 0.38 0.37 0.39 0.36 0.39 0.38 0.Pppm 491.01 507.57 494.36 483.04 488.97 515.89 506.34 518.35 481.three 512.73 484.59 496.2 502.75 491.22 509.11 498.CO3 49.74 49.38 49.72 49.64 49.77 50.45 49.62 49.48 49.95 49.84 49.58 49.57 49.83 49.64 49.7 49.Sppm 219.34 243.65 218.56 251.93 220.97 248.77 218.38 243.94 224.13 237.7 225.39 236.79 223.08 245.74 228.9 239.Clppm 119.eight 228.2 122.07 217.78 68.15 80.32 82.48 89.5 152.four 201.2 142.88 189.7 71.six 81.48 90.5 87.doi:10.1371/journal.pone.0076712.tPLOS 1 | www.plosone.orgStatus Alterations of Soil PotassiumTable three. Diverse forms of potassium of Laboratory measurement for distinctive parameters of 256 soil samples (R, rhizosphere soil; NR, nonrhizosphere).Sample NR116 R1732 NR3348 R4964 N6580 R8196 NR97112 R113128 NR129144 R145160 NR161176 R177192 NR193208 R209224 NR225240 R241K(g/Kg) 14.93 14.9 14.9 14.87 14.7 14.57 14.75 14.eight 14.77 14.73 14.87 14.83 14.73 14.63 14.73 14.wsK(ug/g) 27.1 12.03 20.01 9.22 24.eight five.65 41.28 six.05 38.