INDEX 



755 



Fertilizers, inspection, 556. 



mixed, 561. 



nitrogen, 493. 



penetration into soil, 354. 



practice, 546. 



potash, 522. 



systems of, 573. 



sulfur, 524. 

 • trade value, 559. 

 Fertilizing crops, 571. 

 Filler in fertilizer, 556. 

 Filler in fertilizer, muck, 545. 

 Film water, 206, 210. 

 Fineness in phosphates, 513. 

 Finger lakes, 50. 

 Fire-fanging, manure, 596. 

 First bottom land, 42. 

 Fish as fertilizer, 508. 

 Floats to reinforce manure, 610. 

 Flocculation, 159. 



Flooding, as means of soil infection, 425. 

 Flooding, irrigation by, 699. 

 Flume, for measurement of water, 707. 

 Flushing, correction for alkali, 401. 

 Food of animal, effect on manure, 582. 

 Food elements, sources, 4. 

 Food material in crops, 418. 

 Food of plants, absorption of, 404. 

 Forces of weathering, 14. 

 Formic acid secreted by roots, 408. 

 Forests and acidity, 380. 

 Forest trees, mycorrhize of, 428. 

 Free water in soil, 236. 

 Free water, bad effects, 262. 

 Freezing, effect on granulation, 189. 



relation to soil colloids, 166. 

 Fresh versus leached manure, 601. 

 Friction and available water, 256. 

 Friction coefficient, 229. 

 Frost as soil pulverizer, 680. 

 Frost as weathering agent, 17. 

 Frozen soil, bacteria in, 431. 

 Fruiting effect of nitrogen, 548. 

 Fruits, feeding power, 416. 

 Functions of fertilizers, elements, 547, 

 549, 551. 



of soil to plant, 1. 



of water to plant, 243. 

 Fungi and fire-fanging of manure, 596. 

 Fungi in soil, 423. 

 Furrow, back, productive, 671. 



correct position, 668. 



dead, objectionable, 671. 



depth and width, 669. 



use in irrigation, 702. 

 Fusarium as a disease organism, 426. 



Gabbro, 6. 



Gases, from manure, 594. 



Gel colloids, 159. 



Geological classification of soil material, 



31. 

 Germination, effect of heat on, 290. 

 Glacial drift, 47. 

 Glacial ice, as erosive agent, 16. 

 Glacial lakes, 55. 

 Glacial soil, composition, 52. 

 Glacial soil, humus in, 54. 

 Glacial soils, 47. 

 Glauconite, solubility, 339. 

 Gneiss, 6. 



Grade of drains, 645. 

 Grain, effect of phosphorus, 550 



effect of potassium, 551. 



effect of nitrogen, 548. 

 Granite, 6, 8. 



weathering of, 27. 

 Granular soil, 111. 

 Granulation, 185. 

 Granulation, cause of, 187. 



defined, 170. 



effect of plow, 195. 



effect on cohesion, 179. 

 Granulation of soil and optimum mois- 

 ture, 263. 



effect of drainage, 630. 



modified by tillage, 663. 

 Granulabacter, group of bacteria, 464. 

 Granules in soil, 109. 

 Grass crops, feeding power, 415. 

 Gravel, 99. 



Gravitational water, 201, 233. 

 Gravitational water, injurious to crops, 

 261. 



calculation of, 237. 



control of, drainage, 627. 



movement, factors affecting, 233, 

 235. 



movement of, 233. 



study of, 238. 

 Green manure, 151. 

 Green manure, and acidity, 379. 



conditions for plowing under, 624. 



constituents added, 621. 



crops, 622. 



decay in soil, 622. 



denitrification, 547. 



effects, 619. 



lime relations, 625. 



relation to the rotation, 625. 

 Ground limestone, 540. 

 Ground water and capillarity, 214. 

 Group, the, in soil classification, 723. 



