CONTENTS 



CHAPTER VII 

 EXPERIMENTS UPON ROOT-CROPS GROWN CONTINUOUSLY ON THE SAME LAND 



PAQE 



I. Experiments upon Mangolds, Barn Field, 1876-1911 . 96 



A. Effect of Nitrogenous Manures . . . .99 



B. Effect of Mineral Manures . . . . .103 



C. Comparison of Nitrate of Soda and Ammonium-salts as 



sources of Nitrogen ..... 107 



D. Effect of Nitrogenous and Mineral Manures when used in 



conjunction with Dung . . . . .108 



E. Proportion of Root to Leaf . . . . .112 



F. Proportion of the Nitrogen recovered in Crop to that 



supplied in Manure . . . . .112 



G. The Composition of the Mangold Crop as affected by 



Manuring . . . . . .115 



Practical Conclusions . . . . . .119 



II. Experiments upon Turnips, Barn Field, 1843-1870 . . 119 



Practical Conclusions ...... 



III. Experiments on the Continuous Growth of Potatoes on the same 



Land, Hoos Field, 1876-1901 ..... 122 

 Practical Conclusions . . . . . .126 



IV. Experiments on the Growth of Sugar-Beet . . .127 



A. First Series, 1871-1875 ..... 127 



B. Second Series, 1898-1901 ..... 130 

 Practical Conclusions and References . . . .132 



CHAPTER VIII 



EXPERIMENTS UPON THE CONTINUOUS GROWTH OF LEGUMINOUS CROPS 



I. The Continuous Growth of Beans on the same Land, Geescroft 



Field ........ 133 



II. The Continuous Growth of Red Clover on ordinary Arable Land, 



Hoos Field ....... 141 



III. The Continuous Growth of Clover on rich Garden Soil . . 145 



References . . . . . . 149 



CHAPTER IX 

 EXPERIMENTS UPON GRASS LAND MOWN FOR HAY EVERY YEAR 



I. The Unmanured Plots . . . . . .154 



II. Use of Nitrogenous Manures alone .... 157 



III. Mineral Manures used alone ..... 158 



IV. Complete Manures Nitrogen and Minerals . . . 160 

 V. The Action of Organic Matter . . . . .165 



VI. Effects of Lime . . . . . . .167 



VII. Changes in Herbage following Changes in Manuring . . 168 



VIII. The Effect of Season . . . . .183 



Practical Conclusions . . . . . .187 



References 189 



