Table 6 Results of analysis of variance for grain yield of 13 wheat varieties evaluated at eight environments (sowing dates)

Total

311

2348.374

Sowing date (S)

7

1695.752

242.250^**

72.21

Variety (V)

12

162.867

13.572^**

6.94

S × V

84

430.408

5.124^**

18.33

 PC1

18

303.328

16.852^**

70.47

 PC2

16

87.213

5.451^**

20.26

 PC3

14

18.683

1.335^**

4.34

 PC4

12

10.098

0.842^**

2.35

 PC5

10

7.041

0.704^**

1.64

 PC6

8

2.793

0.349^n.s

0.65

 PC7

6

1.252

0.209^n.s

0.29

 PC8

4

0.000

0.000^n.s

0.00

Residual

208

59.280

0.285^n.s

13.77

Error

297

2183.762

7.353