A study of the deviation of yields from duplicate pot cultures
1934
Davis, F.L.
A study was made of the experimental error of 2,492 yields of sorghum on duplicate pot cultures in the greenhouse. The total number of yields were equally divided in number between two successive crops of sorghum which followed Austrian winter peas on the same soil in pot cultures. A summary of the average yields and of the average deviation and of the standard deviation of the yields by class groups is given. On the basis of the same size of yields the experimental error between duplicate yields was larger on the second crop than it was on the first. For the first crop of sorghum the average deviation of the duplicate yields from their averages was 6.34% of the average yields and for the second crop 7.25% of the average yield. For the first crop of sorghum the standard deviation of duplicate yields from their averages was 8.55% of the average yield and for the second crop 9.84% of the average yield. On those pot cultures producing a yield of over 35 grams of dry matter per pot, the average deviation of duplicate yields of the first crop was 4.17% of the average yield and of the second crop 5.11% of the average yield. The corresponding standard deviation of these yields for the first crop was 5.22% of the average yield and, for the second crop, 6.56% of the average yield.
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