Table 4. Effects of different tillage depths on rice lodging resistance.

Treatment	N1			N2			N3
	Breaking resistance (N)	Bending moment	Lodging index	Breaking resistance (N)	Bending moment	Lodging index	Breaking resistance (N)	Bending moment	Lodging index
TD14	38.71b	1,518ab	40.39a	16.25b	1,291ab	79.72a	13.13b	994ab	77.35a
TD17	55.32a	1,581a	29.37b	28.01a	1,417a	55.85a	18.31a	1,151a	68.28a
TD20	54.03a	1,609a	31.8b	21.22ab	1,416a	72.16a	15.65ab	1,126ab	72.23a
TD23	45.31ab	1,330b	30.52b	16.49b	1,161b	74.83a	11.25b	915b	87.66a
Y	ns	ns	ns	ns	ns	ns	ns	ns	ns
TD	*	ns	ns	ns	*	ns	*	*	ns
Y*TD	ns	ns	ns	ns	ns	ns	ns	ns	ns

Note:

Different letters in the same row within the same rice means the significant differences in P < 0.05. * indicate significant correlations at the 0.05 levels. TD, tillage depth; TD14, tillage depth 14 cm; TD17, tillage depth 17 cm; TD20, tillage depth 20 cm; TD 23, tillage depth 23 cm; Y, year. N1, first node; N2, second node; N3, third node.