6 4 8 



INDEX 



Bulbs, composition, 604 

 Bureau of Soils, United States Department 

 of Agriculture: 



pot cultures, 513 



soil analyses, 136 



soil fertility theories, 313, 362, 367 



soil surveys, 114 

 Butter, composition, 154 



statistics, 623 



Cabbage, composition, 604 



experiments, 266, 278 

 Cake, oil, composition, 604 



fertility loss, 205 



statistics, 626 

 Calcium, 43 

 Calcium cyanamid, 526 

 Calcium determination, 632 

 Calcium nitrate, 526 

 California soils, 102, 138 

 Canadian colleges of agriculture, 646 



experiment stations, 505, 646 



field experiments, 505 



soils, 103, 507, 559 

 Carbohydrates, 30 

 Carbon, 26 

 Carbon cycle, 32 



determination, 628 



fixation, 29 , 



supply as plant food, 33 

 Carbonates, 50 



determination, 628 



loss by leaching, 51, 174 



test, 567 

 Carrots, composition, 604 



field experiments, 511 

 Casein, 41 



Central states soils, 77, 138 

 Cereal seeds, composition, 154, 603 

 Chaff, composition, 603 

 Chemical action, 3, 107, 194, 562 

 Chemical elements, 10 

 Chemistry, defined, i 



organic, 30 



China, agricultural conditions and prac- 

 tices, 335 



Chinese philosophy, 594 

 Chlorin, 44 

 Chlorophyll, 43 



Clarke, on composition of earth's crust, 13 

 Clay, 50, 55 



Clover, composition, 75, 154, 417, 603 

 Clover sickness, 312, 406 

 Coal ashes, composition, 602 

 Coastal plains soils, 117, 138, 139 

 Cobs, corn, composition, 603 

 Colleges of agriculture, 518, 643 

 Colorado soils, 101 



Combining weights of elements, 3 

 Commercial fertilizers, 517 

 Commercial plant food materials, 157 

 Common elements, 13 

 Common functions of elements, 45 

 Composition of animal and plant products, 



157, 602 



Compound, defined, 2 

 Connecticut, investigations with legumes, 

 219 



soil, 138 

 Corn, composition, 13, 75, 154, 603 



cost per bushel, 585 



record yield, 619 



statistics, 606 



Corn cobs, composition, 603 

 Cotton, composition, 154, 497, 603 



statistics, 624 

 Cotton seed, 154, 525, 603 

 Cotton-seed meal, 525, 604 

 Condition of soil, 576 

 Conservation of soil moisture, 577 

 Coral limestone soil, 65 

 Creelman, on farming in Southern Europe, 



329 



Crimson clover tops and roots, composi- 

 tion, 221 



Critical periods in plant life, 538 

 Crop residues, 199 

 statistics, 605 

 stimulants, 533 

 yields (see also statistics): 

 Asia, 334 

 Europe, 326 

 Kansas, 330 

 Crops, composition, botanical, 393 



chemical, 154, 417, 418, 602 

 Crysolite, 47 

 Curie and Gleditsch, on transmutation of 



elements, n 

 Cyanamid, 526 

 Czapek, on availability of plant food, 109 



Decandolle's soil-fertility theories, 310 



Decay of organic matter, 195 



Delaware investigations with legume 



plants, 221, 222 

 Denmark, wheat yield, 614 

 Dentrification, 439, 502 

 De Saussure's discovery of mineral plant 



food, 307 

 Digestion coefficients for organic matter, 



199, 206 



Dolomitic limestone, 169 

 Drainage reclamation possible in the 



United States, 583 

 Dry farming, 579, 581 

 Dyer, on manure used in England, 324 



