Table 7.

Main effects for chlorine and silica

Variate	Harvest					Flowering			Senescence			Genotype
	df	Difference†	SED	Difference‡	SED	df	Difference	SED	df	Difference	SED	df	Difference§	SED
Chlorine	28.1	0.7058***	0.03995	0.1587**	0.05885	48.3	0.3888***	0.06649	22.1	0.5749***	0.0425	35.3	0.418¶	0.0737
Silica	15.3	−0.0325	0.04101	0.0454	0.04209	60.8	−0.1032*	0.04812	19.7	0.0572	0.03779	55.7	0.6075	0.0640

*Indicates significance at 0.1%; **indicates significance at 0.01% and ***indicates significance at 0.001%, for a 2 tail test.

^†Difference from spring to autumn.

^‡Difference from autumn to spring.

^§Differences between highest and lowest values.

^¶For some genotypes.