Correlation matrix of soil nitrogen status i.e. min-N (mineral nitrogen) and TN (total nitrogen) with maize growth parameters i.e. GY (grain yield), PM (plants m-2), LAI (Leaf are index), LA (Leaf area), LP (leaves plant-1), EL (ear length), and PH (Plant height) averaged over two years data of all treatments. The crossed ellipse represents non-significant (P ≤0.0) correlations, and thinner size ellipses have strong correlations.