THE SOIL 



AN INTRODUCTION TO THE SCIENTIFIC STUDY OF THE 

 GROWTH OF CROPS. 



BY A. D. HALL, M.A. (Oxon.), 



President of the Rothamsted Station (Lawes Agricultural Trust) ; 

 First President of the South-Eastern Agricultural College. 



With Diagrams. 55. net. 



The science of agriculture has advanced considerably since the first edition of this book 

 was published, so Mr. Hall has taken advantage of the need for a reprint to produce what 

 is practically a new book. A good deal of fresh material has been added, the latest 

 statistics have been included and the whole text has been thoroughly overhauled and 

 re-set, bringing everything completely up to date. 



An excellent and up-to-date text-book. . . . The complete knowledge of the soil and 

 part it plays in the nutrition of the plants requires investigation along three lines, 

 which may be roughly classed as chemical, physical or mechanical, and biological. It 



the part it plays in the nutrition of the plants requires investigation along three lines, 

 which may be roughly classed as chemical, physical or mechanical, and biological. It 

 is exactly these with which the author deals, and although it is in no sense an exhaustive 



treatise, a general outline has been given of all the recent investigations which have 

 opened up so many soil problems, and thrown new light on difficulties that are experienced 

 in practice." Gardeners' Chronicle. 



THE BOOK OF THE 

 ROTHAMSTED EXPERIMENTS 



BY A. D. HALL, M.A. (Oxon.), 



President of the Rothamsted Experimental Station ; First President of the 

 South-Eastern Agricultural College. 



ISSUED WITH THE AUTHORITY OF THE LAWES AGRICULTURAL TRUST COMMITTEE. 



With Illustrations. Medium 8vo. los. 6d. net. 



CONTENTS. 



BIOGRAPHICAL INTRODUCTION THE SOURCES OF THE NITROGEN OF VEGETATION 

 METEOROLOGICAL OBSERVATIONS THE COMPOSITION OF THE ROTHAMSTED SOIL 

 EXPERIMENTS UPON WHEAT EXPERIMENTS UPON BARLEY EXPERIMENTS UPON 

 OATS EXPERIMENTS UPON ROOT CROPS GROWN CONTINUOUSLY ON THE SAME LAND 

 EXPERIMENTS UPON THE CONTINUOUS GROWTH OF LEGUMINOUS CROPS EXPERI- 

 MENTS UPON GRASS LAND MOWN FOR HAY EVERY YEAR EXPERIMENTS UPON CROPS 

 GROWN IN ROTATION, AGDELL FIELD NITRIFICATION AND THE COMPOSITION OF 

 DRAINAGE WATERS THE FEEDING EXPERIMENTS MISCELLANEOUS ENQUIRIES 

 Appendix INDEX. 



vii 



