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Fred Allen Department of Plant Sciences University of Tennessee

Using Incomplete Block Designs to Reduce Uncontrolled Variation in Field Experiments - Such as Variety Tests. Fred Allen Department of Plant Sciences University of Tennessee. SCC33 Annual Meeting, Feb. 8-10, 2012 New Orleans, LA. SOURCES OF UNCONTROLLED VARIATION IN FIELD EXPERIMENTS:

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Fred Allen Department of Plant Sciences University of Tennessee

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  1. Using Incomplete Block Designs to Reduce Uncontrolled Variation in Field Experiments - Such as Variety Tests Fred Allen Department of Plant Sciences University of Tennessee SCC33 Annual Meeting, Feb. 8-10, 2012 New Orleans, LA

  2. SOURCES OF UNCONTROLLED VARIATION IN FIELD EXPERIMENTS: * EXPERIMENTS WITH A LARGE NUMBER OF TRTS. (e.g. Large number of varieties) * LARGE AMOUNT OF VARIATION IN THE FIELD SITE (e.g., soil type changes, moisture, fertility) ONE WAY TO REDUCE THE UNCONTROLLED VARIATION IS TO USE AN INCOMPLETE BLOCK DESIGN * DIVIDE EACH REP INTO SMALLER BLOCKS * CAN BE IMPOSED EX POST FACTO PLANTING * BLOCK SIZES FROM 8-14 HAVE BEEN OUR BEST EXPERIENCE

  3. TN WHEAT TEST 2011, EXAMPLE OF TWO LOCATION RANDOMIZATION 72 VARIETIES 3 REPS PER LOCATION 7 LOCATIONS

  4. 9 Range Field Layout

  5. 6 Range Field Layout

  6. ANALYSIS OF HRREC USING REPS ANALYSIS OF HRREC USING BLOCKS

  7. ANALYSIS OF ETREC USING REPS ANALYSIS OF ETREC USING BLOCKS

  8. ANALYSIS ACROSS ALL 7 LOCS USING REPS ANALYSIS ACROSS ALL 7 LOCS USING BLOCKS

  9. PARTIAL SUMMARY OF VARIETY MEANS ACROSS LOCS AND FOR THE TWO LOC EXAMPLES * CHANGE IN VALUE OF MEANS * CHANGE IN RANKS ANALYZED BY REPS ANALYZED BY BLOCKS

  10. CORN EXAMPLE SHOWING DIFFERENT # ENTRIES PER BLOCK

  11. 14 ENTRIES PER BLOCK

  12. ANALYSIS USING 8 VARIETIES PER BLOCK ANALYSIS USING 14 VARIETIES PER BLOCK

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