CEEEAL EXPERIMENTS AT JUDITH BASIN SUBSTATION. 11 



age of land, aU crops except winter wheat were grown on twentieth- 

 acre plats. The tenth-acre plats are 2 rods wide and 8 rods long, 

 with alleys 3^ feet wide between the plats and roads 1 rod wide be- 

 tween the blocks or series of plats. The twentieth-acre plats were 

 1 rod wide and 8 rods long, with 20-inch alleys. 



In 1913 some of the winter wheat varieties were gTOwn on acre 

 plats. These plats were 8 rods wide and 20 rods long. The spring- 

 wheat varieties were gTown in fiftieth-acre plats, and the rest of the 

 spring cereals in tenth-acre plats. In 1914 and 1915, part of the 

 winter-wheat varieties were grown in acre plats and the spring- 

 cereals in fiftieth-acre plats. The fiftieth-acre plats are 6 feet wide 

 and 8 rods long, with 18-inch alleys. This plat is actually one fifty- 

 fifth of an acre in area, but as some moisture and plant food are 

 drawn from the alleys, it seems fair to consider them as fiftieth-acre 

 plats in computing acre yields. 

















m 



Mg^^ 



1 





1 



1 



1^ 



Fig. 4 — General view of the cereal experiment plats at the Judith Basin substation, Moccasin, Mont., 



1910. 



REPLICATION OF PLATS. 



From 1908 until 1913 all varieties were grown in single tenth-acre 

 or twentieth-acre plats. In every year except 1908 check plats of a 

 standard variety were grown. In 1913 the spring-wheat varieties 

 were grown in rephcated fiftieth-acre plats, and in 1914 and 1915 all 

 crops except the winter-wheat varieties in acre plats were grown in 

 this way. A 6-foot drill is used and one drill width across the series 

 (8 rods) covers one-fiftieth of an acre. As stated before, these plats 

 are really one fifty-fifth of an acre in area, but in computing acre yields 

 they are considered as one-fiftieth of an acre. In the system of plat 

 repMcation in use at the Judith Basin substation five plats of each 

 variety are grown. These plats are distributed throughout the space 

 devoted to the test. In computing the yields of the varieties grown 

 in rephcated plats the average yield of the five fiftieth-acre plats of 

 any one variety is obtained and the acre yield then computed. 



PREPARATIOX OF THE LAND. 



With few exceptions all the varietal tests of cereals have been con- 

 ducted on fallow ground. In 1908 the crops were sown on sod 



