Table 4 Combined analysis of variance for the studied traits of sugar beet genotypes.

Source of variation	df	Mean of squares
Source of variation	df	White sugar yield	Root yield	Sugar content	Extraction coefficient of sugar
Year	1	20.53^ns	39.56^ns	12.58^ns	15.73^ns
Location	1	397.20^ns	82,840.64^ns	356.44^ns	1926.70^ns
Year × location	1	208.83**	4983.86**	56.97**	2493.16**
Error 1	12	7.70	435.92	3.50	52.29
Genotype	17	94.85**	2886.56**	21.90**	363.13**
Year × genotype	17	3.92*	156.60^ns	2.40**	28.08^ns
Location × genotype	17	2.76^ns	88.42^ns	1.55^ns	35.57^ns
Year × location × genotype	17	21.66**	708.05**	9.24**	190.78**
Error 2	204	2.12	110.26	1.16	28.54

ns, *, **: non-significant and significant at five and one percent probability levels, respectively.

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