Parameters

Correlation co-efficient (r)

Rice grain and straw yield

Grain yield

0.572*

Straw yield

0.548*

Soil properties

Electrical conductivity (EC)

−0.465*

Soil pH

−0.565*

Soil Eh

−0.646**

Exchangeable K

−0.768**

Exchangeable Ca

−0.846***

Exchangeable Na

−0.658**

Water soluble Fe

−0.354**

Water soluble ${\text{SO}}_4^{2-}$

−0.789***