Variability of grain sorghum yield as influenced by size, shape, and number of plats
1930
Swanson, A.F.
The reduction in probable error of grain sorghum yields is not great after the plat has been increased in size to 1/25 acre. Long narrow plats seem the most reliable for varietal trials and certainly are the most practical from the standpoint of economy. The probable error is slightly lower for long narrow plats than for square plats of the same area. When protected by borders, 2- to 4-row plats 8 rods long having an area from 1/50 to 1/25 acre are desirable and convenient units. Since the average yields of grain sorghums on the field stations in the Great Plains are less than 30 bushels per acre, two to four replications of a variety should usually reduce the probable error to 1 to 3 bushels per acre when 1/50 to 1/25 acre plats are used. For dependable results, it is also necessary to grow varieties for a sufficient number of years to sample the seasons which vary greatly in the Great Plains area.
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