Table 4. The effect of climatic and soil physical factors on Italian ryegrass yield factors by regression modeling in the paddy data (R² = 0.37)

Variable	Estimate	Standard error	Coefficient of correlation		p-value
			Pearson	Partial
Autumnal temperature factors	0.30	0.10	0.51	0.28	< 0.05
Spring temperature factors	0.33	0.11	0.60	0.26	< 0.05
Spring precipitation factors	−0.01	0.10	0.34	0.19	0.92
Soil physical factors	0.21	0.09	0.24	0.36	< 0.05