| Numerical Results of the Field Experiments 1968 | 1 |
| Contents 1968 | 3 |
| Conversion Factors | 7 |
| Conventions | 9 |
| Classical Experiments | 11 |
| 68/A/1 Wheat and Three-course Rotation Broadbalk | 11 |
| 68/A/2 Hoosfield Barley and Three-course Rotation | 21 |
| 68/A/3 Hoosfield Wheat and Fallow | 29 |
| 68/A/4 Agdell Grass | 31 |
| 68/A/5 Barnfield Four Course Rotation & Beans After Long Term Experiments on Root Crops | 35 |
| 68/A/6 Hay the Park Grass Plots | 43 |
| 68/A/7 Hoosfield Exhaustion Land | 45 |
| 68/A/8 Rothamsted Garden - Clover | 47 |
| 68/A/9 Saxmundham Rotation I | 49 |
| 68/A/10 Saxmundham Rotation II | 53 |
| Rotation Experiments | 55 |
| 68/B/1 Rothamsted Ley and Arable Rotations | 55 |
| 68/B/2 Woburn Ley Arable Rotations | 73 |
| 68/B/3 Reference Plots Rothamsted and Woburn | 83 |
| 68/B/4 Woburn Market Garden - Beans | 95 |
| 68/B/5 Residual Phosphate Rotation - Potatoes, Barley, Swede | 99 |
| 68/B/6 Cultivation - Weedkiller Rotation - Beans, Wheat, Potatoes, Barley | 103 |
| 68/B/7 Intensive Cereals - Ley, Potatoes, Wheat, Barley | 111 |
| 68/B/8 Long Term Phosphate - Potatoes, Barley | 121 |
| Crop Sequence Experiments | 125 |
| 68/C/1 K, Mg and Na - Grass | 125 |
| 68/C/2 Intensive Barley Growing Experiment - S. Wheat, Barley, Fallow | 137 |
| 68/C/3 Long Term Liming Experiment - Potatoes | 139 |
| 68/C/4 Residues of N, P and K to Grass - Spring Wheat | 145 |
| 68/C/5 Cereal Disease Reference Plots - W. Wheat, S. Wheat | 147 |
| 68/C/6 Irrigation - Potatoes, S. Beans | 149 |
| 68/C/7 Park Grass Microplots - Plots 5/1 and 5/2 | 155 |
| 68/C/8 Park Grass Microplots - Plot 6 | 165 |
| 68/C/9 Sod Seeding and Pests - W. Wheat | 167 |
| 68/C/10 Intensive Winter Barley Growing Experiment | 169 |
| 68/C/11 Effects of Crop Sequences and Green Manures - Legumes, Barley | 171 |
| 68/C/12 Previous Crops X N for Barley | 173 |
| 68/C/13 Rate of Action of P Fertilisers - Ryegrass After Barley | 175 |
| 68/C/14 Effects of Formalin and Nitrogen - W. Wheat | 177 |
| 68/C/15 Virus Control - Lucerne | 181 |
| 68/C/16 P, K and Take-all - Barley | 185 |
| 68/C/17 Insecticides and Molluscicides - Grass | 187 |
| 68/C/18 Organic Manuring Experiment | 189 |
| 68/C/19 Irrigation and Eelworm - Potatoes | 193 |
| 68/C/20 Direct Seeding - W. Wheat | 196 |
| 68/C/21 Effect of Potato Haulm on Winter Wheat | 199 |
| 68/C/22 Soil Sterilants - W. Wheat | 203 |
| 68/C/23 Effects of Formalin and Nitrogen - Grass | 205 |
| 68/C/24 the Effect of Granule Size on the Rate of Release of N from Ibdu - Grass | 207 |
| 68/C/25 N Fixation by Lucerne - Lucerne and Grass | 211 |
| 68/C/26 Nitrogen Fixation by Lucerne - Lucerne and Grass | 221 |
| 68/C/27 Placement of Fumigant for Potatoes | 230 |
| 68/C/28 Rates of Placement of N for Beans | 233 |
| 68/C/29 Simulated Grazing Experiment | 235 |
| 68/C/30 Effect of Soil Compaction on Growth of Sugar Beet | 243 |
| 68/C/31 Soil Structure 2 - Wheat | 247 |
| 68/C/32 Levels of N for Winter Wheat After Spring Beans | 249 |
| 68/C/33 Nematicides (Formerly Ploughsole D-d) - Sugar Beet | 251 |
| 68/C/34 Fumigants and Irrigation - Barley | 257 |
| 68/C/35 Forms of Magnesium on Sugar Beet | 261 |
| 68/C/36 Cereal Cyst-nematode - S. Wheat, Barley | 263 |
| 68/C/37 Nematode-resistant Barley | 267 |
| 68/C/38 N-release from Green Manures - Sugar Beet, Barley | 269 |
| 68/C/39 Saxmundham Intensive Wheat | 275 |
| 68/C/40 Saxmundham Formalin, Nitrogen and Lime for Barley | 277 |
| 68/C/41 Saxmundham Phosphate and Potash - Red Clover | 281 |
| 68/C/42 Saxmundham Phosphate and Potash - Lucerne | 285 |
| 68/C/43 Saxmundham N and Cutting - Grass | 289 |
| Annual Experiments | 291 |
| 68/DA/1 Sowing Dates and Bulb Fly - W. Wheat | 291 |
| 68/DA/2 Cultivations and Bulb Fly - W. Wheat | 293 |
| 68/DA/3 Ccc and Eyespot - W. Wheat | 295 |
| 68/DA/4 Spun and Drilled Seed and Cultivations - W. Wheat | 297 |
| 68/DA/5 Ccc, Row Spacing and N - W. Wheat | 299 |
| 68/DA/6 Varieties and N - W. Wheat | 301 |
| 68/DA/7 Ccc, Row Spacing and N - S. Wheat | 303 |
| 68/DA/8 Effect of Gaps - S. Wheat | 305 |
| 68/DA/9 Effects of Paths and Blank Rows - S. Wheat | 307 |
| 68/DA/10 Anhydrous Ammonia As a Fertiliser - S. Wheat | 309 |
| 68/DA/11 Varieties and N - S. Wheat | 311 |
| 68/DB/1 Effects of Paths and Blank Rows - Barley | 313 |
| 68/DB/2 Spun and Drilled Seed and Cultivations - Barley | 315 |
| 68/DB/3 Varieties X N and Eyespot - Barley | 317 |
| 68/DB/4 Deep Drilled Fertiliser - Barley | 319 |
| 68/DB/5 Woburn Varieties and N - Barley | 321 |
| 68/DC/1 the Effect on Yield of Inoculating Beans With Different Strains of Rhizobium | 323 |
| 68/DC/2 Effect of B-nine*, Irrigation and Its Time of Application on Yield & Growth - S. Beans | 325 |
| 68/DC/3 B-nine* and Nitrogen - S. Beans | 327 |
| 68/DD/1 Row Spacing, N and K - W. Oilseed Rape | 329 |
| 68/DD/2 Row Spacing, N, K and Seed Rate S. Oilseed Rape | 333 |
| 68/DE/1 Effect of Gaps - Potatoes | 337 |
| 68/DE/2 Effects of Gangrene (Phoma Spp. ) - Potatoes | 339 |
| 68/DE/3 Effects of Stem Canker (Rhizoctonia Solani) - Potatoes | 341 |
| 68/DE/4 Effects of Skin-spot (Oospora Pustulans) - Potatoes | 343 |
| 68/DE/5 Rothamsted and Woburn Commercial, Dipped and Healthy Stocks - Potatoes | 345 |
| 68/DE/6 Coiled Sprout and Verticillium Nubilum - Potatoes | 349 |
| 68/DE/7 Warm Water Treated Seed - Potatoes | 353 |
| 68/DE/8 Chemicals and Seed-borne Fungi - Potatoes | 355 |
| 68/DE/9 Effects of Aphids - Potatoes | 357 |
| 68/DE/10 Comparison of Fungicides - Potatoes | 359 |
| 68/DE/11 Post-planting Cultivations - Potatoes | 361 |
| 68/DE/12 Varieties, Nitrogen and Scab (Streptomyces Scabies - Potatoes | 363 |
| 68/DE/13 Woburn the Effect of Chemicals on Common Scab - Potatoes | 367 |
| 68/DE/14 Woburn Fumigants and Nutrients - Potatoes | 369 |
| 68/DF/1 Anhydrous and Aqueous Ammonia - Grass | 375 |
| 68/DF/2 Nitrogen and Damage to Sward by Ammonia-injectors - Grass | 377 |
| Miscellaneous Data | 381 |
| 68/E/1 Meteorological Records 1968 - Rothamsted, Woburn, Saxmundham | 381 |
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