TABLE V-5.


Site and overall mean yields of 15 maize
genotypes evaluated in three sites,
Chimaltenango, Guatemala.


Treatment Site 1 Site 2 Site 3 Overall
(Cultivar) Alameda Parramos Itzapa Mean


 -- metric ton/ha

 1 2.345 5.452 2.965 3.587
 2 2.365 5.053 3.451 3.623
 3 2.861 4.524 3.420 3.601
 4 2.888 5.785 3.226 3.967
 5 3.136 5.861 2.789 3.928
 6 3.244 6.277 3.199 4.240
 7 3.326 6.349 2.882 4.186
 8 2.824 6.369 3.363 4.185
 9 3.553 6.161 2.927 4.214
 10 1.942 3.373 1.755 2.357
 11 3.460 6.537 2.583 4.194
 12 3.186 5.072 2.972 3.744
 13 2.969 6.415 2.693 4.026
 14 2.742 6.702 3.357 4.267
 15 2.808 4.826 2.677 3.437

Source: ICTA, Guatemala


To determine where the


differences


cultivars, Tukey's multiple range test for
Chapter IV) was performed:


exist among
means (see


 D = Q Sx
 = Qt,df (S2 / bs)1/2
 = 015,126 x (0.3958 / 4x3)1/2
 = 4.90 x (.1816)
 = 0.89 ton/ha

The smallest difference between the mean yields of two
cultivars that will make them significantly different at
the 5% level of confidence is 0.89 ton/ha.
 All treatment means are listed in descending order
and the same letter is placed next to all those that are
not different when compared: