EXPERIMENTS IN FIELD PLOT TCHNIC 



19 



On another field in 1921, a test of mixtures of varieties and 

 strains of wheat in comparison with their pure constituents was con- 

 ducted. Each mixture was made up of four varieties or strains, in 

 equal quantities of seed by weight. The composition of the mixtures 

 and the yields obtained are shown in Table 6. The planting plan is 

 shown in figure 4. This wheat was drilled at the rate of 5 pecks per 



FIGURE 4. PLANTING PLAN OF WHEAT MIXTURE TEST 1921. Legend: B, 

 border. CK, check. Numbers 1-30, planting numbers of varieties and mixtures 

 tested, as given in Table 6. 



acre in rows running north and south, on October 8, 1920. This test 

 will be referred to as the wheat mixture test. 



In 1921 tests of oats varieties and of oats strains were also con- 

 ducted in 5-row blocks. Thirty-two strains of Red Rustproof, in- 

 cluding many of those tested in 1919 and a number of others, and 32 

 strains of Kherson oats, obtained in the same way, were included in 

 the oats strain test. The Kherson and Red Rustproof strains were 

 arranged alternately, and both Kherson and Red Rustproof checks 

 were grown, as shown in figure 5. The test of these 64 strains, in 

 four series, occupied 16 ranges. The next eight ranges on the same 

 plot were used for an oats variety test in which 32 varieties of oats 

 were compared, each in four replicate plots. In this part of the field 

 the Kherson and Red Rustproof check plots were continued. There 

 are thus available the yields of 120 plots each of Kherson and Red 

 Rustproof oats, or five strips of 24 plots of each arranged in pairs 

 side by side. In both of these experiments the rows ran east and 

 west, and were 18 feet long, cut to 16 feet in harvesting. The oats 

 were drilled on March 12, at the rate of 10 pecks per acre. The yields 

 of oats, particularly of the later-maturing varieties, were materially re- 

 duced by the hot dry weather in the middle of June. The yields of the 

 oats varieties are shown in Table 7, and those of the strains in Table 8. 



