CONTENTS. 



VU 



CHAPTER III. 

 Various Manures. 



PAOE 



George Ville' 3 investigations 125 



Elements of which plants are composed . .... 126 



Organic; barnyard manures . . . . . . . . .127 



Green manures ; oilcake . . .... 129 



Guano ... 130 



Mineral fertilizers ; nitric fertilizer 131 



Nitrate of soda 133 



Sulphate of ammonia ; phosphoric fertilizers 135 



Potassic fertilizers . . . . . . . . . .137 



Calcareous fertilizers . . . 138 



Comparative results obtained with chemical fertilizers and ordinary barn- 

 yard manure — ^beets . . . . . . . . . .140 



Champignon and Pellet's experiments ; experiments of Corenwinder . 144 

 Choice of a manure ; experiments of Deherain . . . . .145 



Experiments of Pagnoul . 148 



Vivien's views ; George Ville's complete fertilizer .... 149 

 Corenwinder's experiments; Coignet's views ..... 150 

 Joulie's experiments . . 151 



CHAPTER IV. 



Seeds and Sowing. 



Generalities; analysis of Champignon and Pellet 152 



Germination 155 



Humidity ... 156 



Heat; air 157 



Light ; treatment of the seed before sowing ] 58 



Time for sowing 161 



Depth of planting 163 



Distance most favorable for the roots . . . . . . .165 



Sowing broadcast . 169 



Transplanting 170 



Mechanical devices for sowing . . 171 



Changes during vegetation . . . . . . . .173 



Rain; experiments of Walkhoff .174 



Heat; experiments of Champigon and Pellet . . . .175 



CHAPTER V. 



Production and Improvement op the Seed of the Sugar Beet. 



Hereditary principles 176 



Characteristic points of beets rich in sugar ; choosing of the mothers to 



be planted 177 



Knauer' 3 machine for dividing the roots according to their weight . .178 



