highly significantP < 0.0001
Although, the fit for regression equation was poor for maize (R 2 = 0.14) and rice (R 2 = 0.16), and was moderate for soybean (R 2 = 0.35), these regressions were highly significant ( P < 0.0001) and indicate that the predictor variables still provide information about the response even though data points fall further from the regression line.