 We are evaluating yield of 10 wheat genotypes  in six locations that are
selected randomly. In each location, we have 8 farmers, Among them, 4 are
early planting group and 4 are late planting group based on optimum
planting date. Each farmer's plot has been divided into 3 main plots –
where three doses of Nitrogen have applied. Each main plot has further been
divided into 10 subplots. Where 10 wheat varieties have assigned randomly.
The  experiment has repeated for 2 years.
We want to use a mixed model to evaluate the wheat yield. Our treatment
structure given below:

Envirionment (site x no. year) = 6 X 2 = 12  (Random)

Farmers = 8 (Random)

Planting groups = 2 (Fixed)

N-treatment = 3 (Fixed)

Genotype =10  (Fixed)

We appreciate if someone help use to develop a mixed model in *R/lme4 or
lme.**It is little challenging for me*
Thanks
Zia

-- 
Zia Uddin Ahmed

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