| Yields of the Field Experiments 1966 - Numerical Results | 1 |
| Contents 1966 | 5 |
| Classical Experiments | 11 |
| 66/R/BK/A/1 Broadbalk - Wheat | 11 |
| 66/R/HB/A/2 Hoosfield - Barley | 15 |
| 66/R/HWF/A/3 Hoosfield - Wheat After Fallow | 17 |
| 66/R/AG/A/4 Agdell - Grass | 19 |
| 66/R/BN/A/5 Barnfield - Fallow | 23 |
| 66/R/PG/A/6 Park Grass - Hay | 25 |
| 66/R/EX/A/7 Hoosfield Exhaustion Land - Barley | 27 |
| 66/R/GC/A/8 Rothamsted Garden - Clover | 29 |
| 66/W/WPW/A/9 and 66/W/WPB/A/9 Woburn Stackyard - Fallow | 31 |
| 66/S/SA/A/10 Saxmundham - Rotation 1 | 33 |
| 66/S/SB/A/11 Saxmundham - Rotation 2 | 37 |
| Rotation Experiments | 39 |
| 66/R/HIA/B/1 and 66/R/FLA/B/1 Ley and Arable Rotations | 39 |
| 66/R/B/2 and 66/W/B/2 Reference Plots (Ra, Rg, Wra, Wrf) | 55 |
| 66/W/WGM/B/3 Green Manuring | 65 |
| 66/W/WLA/B/4 Ley and Arable Rotations | 75 |
| 66/W/WMG/B/5 Market Garden Soil | 87 |
| 66/R/RP/B/6 Residual Phosphate Rotation | 105 |
| 66/R/CW/B/7 Cultivation-weedkiller Rotation | 107 |
| 66/W/WCW/B/8 Cultivation-weedkiller Rotation | 113 |
| 66/W/WIC/B/9 Intensive Cereals | 117 |
| Crop Sequence Experiments - Crops in 1966 | 121 |
| 66/R/LM/C/1 K, Mg and Na - Kale | 121 |
| 66/R/IB/C/2 Intensive Barley Growing - Cereals | 125 |
| 66/R/LL/C/3 and 66/W/WLL/C/3 Long-term Liming - Barley | 127 |
| 66/W/WBT/C/4 Methods of Application of Fertiliser 1965-66 - Spring Wheat | 131 |
| 66/R/AF/C/5 Levels of N and K - Grass 9th Year | 135 |
| 66/R/AO/C/6 Decline of Take-all - Winter Wheat | 139 |
| 66/R/AQ/C/7 Cereal Disease Reference Plots - Wheat | 141 |
| 66/R/AZ/C/8 Row Spacing N and Paraquat - Lucerne 3rd Year | 143 |
| 66/R/IR/C/9 Irrigation - Potatoes and Barley | 149 |
| 66/W/WBU/C/10 Row Spacing and Fertilisers 1965066 - Barley | 157 |
| 66/W/C/11 Soil Structure 2 Woburn - Early Potatoes and Red Beet | 159 |
| 66/R/C/12 Oxamide - Grass | 163 |
| 66/R/PGM/C/13 N P K - Old Grass (Park Grass Plot 5 Microplots) | 165 |
| 66/R/PGM/C/14 N P K and Cutting - Old Grass (Park Grass Plot 6 Microplots) | 175 |
| 66/R/BH/C/15 Sod Seeding and Pests - Spring Wheat | 177 |
| 66/R/BJ/C/16 Intensive Winter Wheat - Winter Barley | 179 |
| 66/R/BP/C/17 Legumes and Barley - Cereals and Hay | 181 |
| 66/R/BQ/C/18 Previous Crops and N for Barley 1965-66 - Barley | 185 |
| 66/R/BY/C/19 Previous Crops and N for Barley 1965-66 - Spring Wheat, Kale and Ryegrass | 189 |
| 66/R/C/20 Rate of Action of P Fertilisers 1965-66 - Barley and Ryegrass | 193 |
| 66/R/C/21 Rate of Action of P Fertilisers 1966-67 - Early Potatoes and Radishes | 197 |
| 66/R/BR/C/22 and 66/R/BS/C/22 Formalin and N - 2 Sites - Spring Wheat | 201 |
| 66/W/WBL/C/23 Scorch Study - Spring Wheat 3rd Year | 207 |
| 66/W/WBO/C/24 Fumigants - Spring Wheat | 209 |
| 66/W/C/25 K and Protein Synthesis - Grass | 213 |
| 66/R/BZ/C/26 Lucerne Virus Control - Lucerne and Lucerne/COCKSFOOT | 217 |
| 66/R/BX/C/27 Anhydrous Ammonia - Established Grass | 219 |
| 66/R/CA/C/28 Levels and Forms of N - Spring Beans | 223 |
| 66/R/CC/C/29 and 66/W/WCD/C/29 Dd and Dazomet - Spring Wheat | 225 |
| 66/S/SC/C/30 Intensive Wheat - Winter Wheat | 227 |
| 66/W/WOM/C/31 Organic Manuring | 229 |
| 66/W/WCE/C/32 Irrigation and Eelworm - Potatoes | 235 |
| 66/W/WBW/C/33 Direct Seeding - Spring Wheat | 241 |
| Annual Experiments | 243 |
| 66/R/RW101/DA/1 and 66/W/WW101/DA/1 Winter Wheat - Row Spacing | 243 |
| 66/R/RW301/DA/2 Winter Wheat - Spun Seed | 247 |
| 66/R/BG13/DA/3 Winter Wheat - Sowing Dates and Bulb Fly | 249 |
| 66/R/RW601/DA/4 and 66/W/WW301/DA/4 Spring Wheat - Anhydrous Ammonia | 251 |
| 66/W/WW201/DA/5 Spring Wheat - Sowing Dates | 255 |
| 66/R/RW701/DA/6 Spring Wheat - Ccc | 257 |
| 66/W/WW401/DA/7 Spring Wheat - Ccc and Irrigation | 259 |
| 66/R/RW401/DA/8 Winter Wheat and Spring Wheat - Varieties and N | 261 |
| 66/R/RB101/DB/1AND 66/W/WB101/DB/1 Barley - Row Spacing | 263 |
| 66/R/RB201/DB/2 Barley - Spun Seed | 267 |
| 66/R/RBE101/DC/1 Spring Beans - Irrigation and Row Spacing | 271 |
| 66/R/RP1/1/DD/1 Early Potatoes - Dsa | 273 |
| 66/R/RP3/1/DD/2 and 66/W/WP201/DD/2 Potatoes - Soil Fungicides | 275 |
| 66/R/RP6/1/DD/3 and 66/R/RP6/1/DD/3 Potatoes - Effect of Gaps - 2 Sites | 279 |
| 66/R/RP7/1/DD/4 Potatoes - Oospora | 283 |
| 66/R/RP8/1/DD/5 Potatoes - Rhizoctonia | 285 |
| 66/R/RP9/1/DD/6 Potatoes - Gangrene | 287 |
| 66/R/RP10/1/DD/7 Potatoes - Oospora (Dead Eyes) | 289 |
| 66/R/RP11/1/DD/8 Potatoes - Time of Burning Off | 291 |
| 66/W/WP101/DD/9 Potatoes - Varieties | 293 |
| 66/W/WP301/DD/10 Potatoes - Verticillium | 295 |
| 66/W/WP401/DD/11 Potatoes - Tuber Blight | 299 |
| 66/W/WCT1/DE/1 Carrots - Motley Dwarf Virus | 301 |
| 66/W/WK/DF/1 Kale - Urea | 303 |
| Miscellaneous Data | 305 |
| 66/E/1 Meteorological Readings - Rothamsted | 305 |
| 66/E/1 Meteorological Readings - Woburn | 306 |
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