Table 6. Model fitting results and ANOVA results.

Model terms	Saponins yield (mg/g Panax notoginseng)								TSP (%)		Pigment yield (ln(µg/g Panax notoginseng))
	R1		Rg1		Rb1		Rd
	Estimate	Prob>|t|	Estimate	Prob>|t|	Estimate	Prob>|t|	Estimate	Prob>|t|	Estimate	Prob>|t|	Estimate	Prob>|t|
Constant	13.6768	——	46.2633	——	46.2281	——	9.4700	——	27.3738	——	8.0307	——
X1	−0.6278	0.0651	−2.9012	0.0087**	−4.6364	0.0016**	−0.8498	0.0006**	1.2403	0.0211*	−0.5855	0.0002**
X2	0.3367	0.2723	0.8127	0.3251	1.9695	0.0612	0.3506	0.0360*	0.2196	0.6027	0.3729	0.0017**
X3	0.9555	0.0140*	2.1364	0.0305*	3.0673	0.0116*	0.6434	0.0026**	−1.1593	0.0274*	1.0467	<0.0001**
X1 X2	0.2365	0.5702	1.6575	0.1732	0.6454	0.6134	−0.0487	0.8002	0.5534	0.3655	0.2267	0.0604
X1 X3	−0.3715	0.3821	0.6669	0.5569	0.4740	0.7092	−0.0805	0.6777	1.6996	0.0238*	0.0399	0.6985
X2 X3	0.5233	0.2324	−0.2902	0.7958	0.1268	0.9201	−0.1566	0.4280	−0.9062	0.1601	0.0765	0.4653
X1 2	−1.7090	0.0049**	−5.9570	0.0014**	−6.2568	0.0021**	−1.0188	0.0015**	−1.0889	0.1024	−0.1484	0.1816
X2 2	−0.7323	0.1124	−1.7398	0.1559	−1.2746	0.3334	−0.0591	0.7594	−1.3371	0.0559	0.1414	0.2000
X3 2	−0.4902	0.2598	−1.0717	0.3563	−1.7609	0.1964	−0.0353	0.8544	2.9760	0.0019**	−1.4191	<0.0001**
Model P value	0.0315*		0.0151*		0.0081**		0.0036**		0.0115*		<0.0001**
R2	0.8827		0.9105		0.9283		0.9463		0.9188		0.9891

*p<0.05

**p<0.01.