Skip to main content

Table 4 Results from correlation analyses and stepwise linear regressions of colloidal P and colloidal P/TDP in different-sized aggregates with soil aggregate-associated mean weight diameter (MWD), geometric mean diameter (GMD), pH, total carbon (TC), total nitrogen (TN), C/P, C/N, Al, Fe, and Ca

From: Enhanced soil aggregate stability limits colloidal phosphorus loss potentials in agricultural systems

IndexesAggregate sizesTCTNTPpHAlFeCaC/PC/NMWDGMD
Colloidal PTotal0.1510.1340.706**0.223*0.220*0.251**0.269**− 0.424**0.241*0.224*− 0.101
2–8 mm0.3020.3280.769**0.0950.374*0.464*0.492**− 0.517**0.1180.136− 0.247
0.26–2 mm0.0890.1290.796**0.0120.2770.3170.142− 0.644**0.1020.102− 0.264
0.053–0.26 mm0.1490.1280.662**0.3110.2040.1900.085− 0.461*0.2950.290− 0.124
< 0.053 mm0.2820.1010.3440.631**− 0.115− 0.0850.588**0.1270.541**0.528**0.189
Colloidal P/TDPTotal− 0.522**− 0.471**0.026− 0.301*0.474**0.365**− 0.373**− 0.449**− 0.298*− 0.072− 0.056
2–8 mm− 0.509− 0.4520.315− 0.3870.764**0.707**− 0.441− 0.807**− 0.435− 0.048− 0.030
0.26–2 mm− 0.645**− 0.547*0.147− 0.4360.741**0.513− 0.688**− 0.632*− 0.411− 0.090− 0.097
0.053–0.26 mm− 0.485− 0.429− 0.008− 0.4350.515*0.458− 0.711**− 0.364− 0.234− 0.082− 0.025
< 0.053 mm− 0.386− 0.455− 0.3220.1070.2470.1040.261− 0.0130.002− 0.074− 0.086
Stepwise linear regressionColloidal PStepwise linear regressionColloidal P/TDP
R2FPR2FP
 0.60544.116< 0.001 0.53916.058< 0.001
 BtP BtP
(Constant)− 8.017− 2.9790.004(Constant)0.4782.980.004
Al0.0873.2350.018TC− 0.028− 6.947< 0.001
TP10.5983.88< 0.001Fe0.0154.883< 0.001
TN− 2.2573.6340.004MWD0.4133.911< 0.001
MWD5.977− 2.651< 0.001GMD− 0.363− 2.0570.044
  1. Total total soil aggregate sizes
  2. P < 0.05. ** P < 0.01