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Table 5 Significant variables selected during the the stepwise regression analysis when shoot dry matter contents were related to the measured leaf nutrient concentrations, magnitude of their coefficients and partial R2values

From: Effect of rubber wood biochar on nutrition and growth of nursery plants of Hevea brasiliensis established in an Ultisol

Growth stage

Independent variable

Dependant variables

Coefficient

R2

P value

Before cut-back

Shoot dry matter

Full model

 

0.596

<0.001

Intercept

19.7

  

Leaf K concentration

−13.7

0.397

0.002

Leaf Mn concentration

0.08

0.199

0.043

After cut-back

Shoot dry matter

Full model

 

0.638

<0.001

Intercept

9.5

  

Leaf K concentration

– 9.44

0.506

0.016

Leaf Mn concentration

0.08

0.132

0.012