VAKIETY TRIALS 



67 



farming, the wheats being grown in a different field each year. 

 Table XXVIlA. shows the results obtained in bushels per 

 acre each year, and Table XXVIlB. the same results 

 reduced each year to the common ratio of the average 



TABLE XXVIIs. Varieties of Wheat grown at Eothamsted, 1871-1881. 

 Mean Produce of all the varieties each year taken as 100. 



crop taken as 100. The final order represents the mean 

 of these last figures, and shows the average relative position 

 occupied by each variety when seasonal fluctuations are 

 eliminated and each year is allowed the same weight in 

 making up the average. It is evident from the fluctuating 

 position any wheat occupies from year to year that variety 

 tests require a good many repetitions before great trust can 

 be placed in their results. In the present case five wheats 

 stand out as considerably heavier croppers than the others on 

 the strong Rothamsted land Rivet, White Chaff (Red), Club, 



