4 TABLES 



12 Correlation of Competition with Various Characteristics in Oats Strain 



Test 1919 36 



13 Correlation of Competition with Various Characteristics in Wheat Va- 



riety Test 1920 37 



14. Correlation of Competition with Various Characteristics in Wheat Va- 

 riety Test 1921 37 



15 Correlation of Competition with Various Characteristics in Wheat Mix- 



ture Test 1921 38 



16 Correlation of Competition with Various Characteristics in Oats Va- 



riety Test 1921 39 



17 Summary of Effects of Competition in All Tests 41 



18 Correlation of Yield with Dates of Heading and Maturity in Variety 



Tests of Barley, Oats, and Wheat 42 



19 Yield and Variability of 1-row, 3-row, and 5-row Check Plots in Bar- 



ley Variety Test 1919 45 



20 Yield and Variability of 1-row, 3-row, and 5-row Check Plots in Oats 



Variety Test 1919 46 



21 Yield and Variability of 1-row, 3-row, and 5-row Check Plots in Oats 



Strain Test 1919 47 



22 Yield and Variability of 1-row, 3-row, and 5-row Check Plots in Wheat 



Variety Test 1920 47 



23 Yield and Variability of 3-row and 5-row Check Plots in Wheat and 



Oats Test 1921 48 



24 Yield and Variability of 3-row and 5-row Test Plots in All Tests 50 



25 Relation of Plot Variability to Size of Experiment Field in Wheat Va- 



riety Test 1920 51 



26 Relation of Plot Variability to Size of Experiment Field in Wheat Va- 



riety Test 1921 52 



27 Relation of Plot Variability to Size of Experiment Field in Oats Va- 



riety and Strain Tests 1921 52 



28 Soil Heterogeneity of an Experiment Field as Determined from Yields 



of Two Check Varieties 53 



29 Effect on Plot Variability of Adjusting Yields by Check Plots (Kies- 



selbach) 55 



30 Reduction of Variability by the Use of Check Plots Equivalent to That 



Probably Attainable with the Same Number of Plots by Replication . 57 



31 Relative Variability of Actual and Adjusted Yields in Barley Variety 



Test 1919 59 



32 Relative Variability of Actual and Adjusted Yields in Oats Variety 



Test 1919 60 



33 Relative Variability of Actual and Adjusted Yields in Oats Strain 



Test 1919 61 



34 Relative Variability of Actual and Adjusted Yields in Wheat Variety 



Test 1920 62 



35 Relative Variability of Actual and Adjusted Yields in Wheat Variety 



Test 1921 64 



36 Relative Variability of Actual and Adjusted Yields in Wheat Mixture 



Test 1921 65 



37 Relative Variability of Actual and Adjusted Yields in Oats Variety 



Test 1921 66 



38 Relative Variability of Actual and Adjusted Yields in Oats Strain 



Test 1921 67 



39 Relative Variability of Actual and Adjusted Yields of Kherson and Red 



Rustproof Oats Each in 120 Distributed Plots, in Oats Variety and 

 Strain Tests 1921 68 



40 Summary of Relative Variability of Actual and Adjusted Yields of 



Interior Rows in All Tests 1921 . . 71 



