Table 6. Effects of different silicon (Si) treatments on rice brown spot development at the anthesis stage (%).

Fertilizer	Rate	Incidence of disease	Disease index
Control	Si0	39.7±2.11a	56.1±2.60 a
Q	Si1	4.67±0.60 b	22.0±3.50 b
	Si2	1.33±1.53 b	8.64±2.71bc
	Si3	0.33±0.58 b	2.22±3.85 c
H	Si1	3.67±2.08 b	18.0±2.26 bc
	Si2	1.33± 0.58 b	8.89±2.67bc
	Si3	0.00±0.0 b	0.00±0.00 c

Si₀: no Si fertilizer; Si₁: slag fertilizer applied at a rate of 187 mg plant-available Si per kg soil; Si₂: slag fertilizer applied at a rate of 560 mg plant-available Si per kg soil; Si₃: slag fertilizer applied at a rate of 935 mg plant-available Si per kg soil; H: slag fertilizer H, Q: slag fertilizer Q; Data are means ± SD of three replicates; mean values followed by different letters (a, b, c) are significantly different (P≤0.05).