Table 7. Effects of different tillage depths on yield and its related traits.

Treatment	Panicle number (panicle/hole)	Grain number per panicle (grains/panicle)	Seed setting rate (%)	1,000-grain weight (g)	Yield (t/ha)
TD14	14.8b	150.1b	89.9a	22.2a	9.8b
TD17	16.1a	157.9a	90.4a	22.2a	10.5ab
TD20	16.9a	156.3a	90.3a	22.3a	10.7a
TD23	15.3ab	154.7a	90.1a	22.2a	10.4ab
Y	ns	ns	ns	ns	ns
TD	*	*	ns	ns	*
Y*TD	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.