Soil Quality and Water Redistribution Influences on Plant Production over Low Hillslopes on Reclaimed Mined Land

Table 6

Linear and multilinear regressions of 1978 spring wheat and perennial forages’ relative yields versus water redistribution index (WRI), respread soil depth (RSD), and soil quality index (SQI) aggregated across soil treatments at Zap and Stanton sites. The third column in each group indicates the sign of regression coefficient(s). For entries with , and other information are not given. ns means multilinear regression coefficient has .

-variable(s)

Zap 1978 all soils

Zap 1978 all soils

Stanton 1978 all soils

Stanton 1978 all soils

Spring wheat,

Perennials,

Spring wheat,

Perennials,

coefficient sign

coefficient sign

coefficient sign

coefficient sign

WRI

0.349

0.186

<0.001

P^†

0.057

0.021

N

0.492

RSD

0.081

0.003

P

0.200

<0.001

N

0.204

<0.001

P

0.092

0.004

P

RSD + WRI

0.119

0.001

P; P

0.220

<0.001

N; ns

0.351

<0.001

P; P

0.311

<0.001

P; P

SQI

0.047

0.024

P

0.257

<0.001

N

0.285

<0.001

P

0.314

<0.001

P

SQI + WRI

0.055

0.052

P; ns

0.268

<0.001

N; ns

0.285

<0.001

P; ns

0.352

<0.001

P; P

= positive; N = negative.