Study on the Effect of Straw Mulching on Farmland Soil Water

Table 3

Variance analysis results of soil water storage under straw mulching.

Source	Sum of squares	df	Mean square	value	value
Model	16593.83	14	1185.27	28.77	<0.0001
—film thickness	13520.65	1	13520.65	328.17	<0.0001
—straw returning amount	2002.08	1	2002.08	48.59	<0.0001
—straw particle size	108	1	108	2.62	0.1277
—straw returning depth	244.8	1	244.8	5.94	0.0287
	92.16	1	92.16	2.24	0.157
	9.92	1	9.92	0.24	0.6312
	17.22	1	17.22	0.42	0.5284
	1.44	1	1.44	0.035	0.8544
	0.81	1	0.81	0.02	0.8905
	336.72	1	336.72	8.17	0.0126
	46.5	1	46.5	1.13	0.306
	35.14	1	35.14	0.85	0.3714
	126.87	1	126.87	3.08	0.1011
	2.32	1	2.32	0.056	0.816
Residual	576.8	14	41.2
Lack of fit	569.74	10	56.97	32.24	0.0022
Pure error	7.07	4	1.77
Cor total	17170.63	28

Note: indicates a significant difference, ; indicates extremely significant.