390 



EXPERIMENT STATION RECORD 



Nitrogen— Com i lined . 



compounds— coiiliniu'd. 



of soils nnd feitilizors, (37) 21f). 

 physical and chcniicnl data, (40) 607. 

 sources in linitud States, (37) 217. 

 synthesis by plants, (3fi) 631. 

 containing bodies in grape leaves, (27) 731. 

 containing sulistanccs, cleavage by yeast, (26) 



607. 

 cycle in nature, (34) 423. 

 cycle in soils. (27) 517. 

 deficiency, elTect on oat plant, (40) 324. 

 determination, (26) 311, 606; (29) 796, 807; (30) 

 504; (31) 205; (32) 294, 309, 310; (33) 109; (34) 

 10, 604; (35) 110; (36) 14, 316; (39) 610; (40) 111, 

 711, 806. 

 determination— 



by coloriinetry, (33) 312. 

 in alfalfa hay, (37) 309. 

 algae. (36) 202. 

 aiuinuniates, (26) 803. 

 bacterial eelKs, (38) 613. 

 hetain, (27) 814. 

 bovine flesh, (39) 201. 

 calcium cyanamid, (26) 804; (36) 426; (37) 



413. 

 caustic soda, (32) 300. 

 commercial ammoniates, (27) 8. 

 cottonseed meal, (39) 506. 

 eggs, (39) 715. 

 feeding stuffs, (40) 510. 

 fertilizers, (27) 206; (28) 726; (37) 504. 

 flour, (27) 498. 

 forage plants, (37) 113. 

 humus, (30) 112. 

 meat extract, (27) 498. 

 meat products, (29) 800. 

 meats and meat extracts, (32) 299. 

 mixtures of calcium nitrate and cyana- 

 mid, (33) 711. 

 nitrates, (27) 496. 

 Norwegian saltpeter, (33) 711. 

 organic substances, (30) 807. 

 peat, (28) 508. 

 raw rubber, (30) 615. 

 rubber, (39) 315. 

 soil solution, (39) 610. 

 soils, (28) 519; (29) 317; (32) 807; (36) 



711. 

 tobacco leaves, (37) 509. 

 urine, (26) 870; (29) 508; (31) 502. 

 vegetable matter, (34) 410. 

 water (27) 497. 

 water'and emuents, (34) 410. 

 wheat, (40) 507. 

 Kjeldahl apparatus, (36) 14. 

 Kjeldahl method, (27) 409, 804; (39) 204. 

 micro-Kjeldahl apparatus for, (30) 505. 

 digestion^ 



apparatus, description, (37) 503. 

 as alTected by sugar, (32) 362. 

 fumeless Kjeldahl, apparatus for, (28) 311. 

 distribution— 



during fasting, (27) 465. 

 in protalbinic and lysalbinic acids, (38) 310. 

 seeds, determination, (40) 502. 

 soils, (37) 517. 

 wheat splices, (26) 739. 

 economy in Tennessee soils, (38) 212. 

 economy of nature, relation to cellulose decom- 

 position, (28) 720; (30) 424. 

 effect on— 



apples, (28) 144. 

 carnations and roses, (29) 840. 

 devitalized apple trees, (35) 540. 

 must and wine, (30) 612. 

 peaches, (33) 840. 



variation of tomatoes and beans, (29) 339. 

 elimination as alfected by diet, (30) 864. 

 exchange during fasting, (30) 260. 

 fate in the animal body, (35) 473. 

 fecal, origin, (26) 663. 

 fertilization, elTect on development of wheat, 



(27) 38. 

 fertilizing value, (26) 537; (27) 324, 436, 437; (28) 



122. 

 fixation and oxygen release in green plants, 



(37) 25. 

 fixation as alTected by- 

 carbohydrates, (28) 816. 



Nitrogen— Continued. 



fixation as affected by— continued. 



carbon disulphid and toluol, (40) 513 

 colloids, (30) 431. 

 humus, (32) 515. 



humus-forming materials, (35) 216. 

 liming, (26) 428. 

 plant residues, (40) 121. 

 sodium nitrate, (38) 723. 

 soil moisture, (36) 513. 

 soil reaction, (39) 722, 723. 

 soluble humates, (30) 431, 721; (31) 516. 

 stimulants, (27) 131. 

 sugar, (40) 122. 

 fixation- 

 bacteriological studies, (26) 521. 

 bv aerobic organisms, (27) 729; (31) 721. 

 alumina and carbon, (28) 222; (29) 417. 

 Azotobacter, (27) 517, 828; (33) 823, 620. 

 barium oxid and charcoal, (29) 822. 

 fungi, (27) 225; (36) 632. 

 grass-green algae, (30) 727; (31) 827. 

 leguminous plants. (26) 37, 722; (38) 528. 

 microorganisms, (28) 323; (29) 819; (38) 



426. 427; (39) 818. 

 plants. (28) 35; (29) 133; (37) 129; (38) 122. 

 soil bacteria. (28) 628; (30) 217. 

 soil flora, (35) 320. 

 zeolites, (29) 211. 

 electric, (40) 127. 

 factors affecting, (36) 321. 

 in Colorado soils, (29) 621. 

 manure, (38) 27, 325. 

 Nebraska soils, (29) 734. 

 sandy soils, (33) 619. 



soils, (26) 616; (27) 419; (28) 31; (30) 818; 

 (31) 24, 818; (32) 124, 514; (33) 620; (34) 

 422, 423, 619. 

 soils as affected by sulphur, (31) 125. 

 stable manure, (35) 218. 

 virgin and cultivated soils, (32) 216. 

 recent advances in, (40) 801. 

 relation to green manures, (38) 27. 

 review of literature, (29) 527. 

 role of alumina in, (29) 24. 

 role of microorganisms in, (26) 37. 

 seasonal variation, (32) 514. 

 studies, (26) 625; (28) 519; (33) 323. 

 fixing organisms — 



in Iowa soils, (37) 517. 

 media for, (35) 226. 

 for barley, (26) 535. 



corn and wheat, (39) 127. 

 peaches, (33) 236. 

 sweet potatoes, (33) 337. 

 form of in soils, (33) 513. 

 fraction, new, in soils, (37) 518. 

 free amino, in proteins of ox and horse serum, 



(34) 501. 

 free extracts in feeds and foods, (32) 21. 

 from alfalfa hav and corn, comparative eflB- 



ciency, (28) 264. 

 from olive-oil residue, (40) 26. 

 from Pacific coast kelps, (33) 125. 

 gaseous, in swamp rice soils, (37) 424. 

 green manure, accumulation in sandy soils, (26) 



224; (30) 24. 

 humin, notes, (27) 671. 

 hunger, metabolism in, (26) 764. 

 in alcoholic extracts of leaves, (27) 731. 



alfalfa hay and corn, comparative efficiency, 



(32) 863. 

 amylase preparations from pancreas and 



malt, (30) 463. 

 beet-sugar bv-products, (.39) 417. 

 clays and marls, (32) 121. 

 coalgulum and serum of Hevea latex, (36) 710. 

 cultivated and abandoned lands, (38) 622. 

 dry-farm soils, (31) 318. 

 eggs, (28) 64. 

 forest soils, (33) 720. 

 garbage tankage, (40) 134. 

 growing pigs as affected by protein consump- 

 tion, (32) 73. 

 humus of arid soils, (34) 719. 

 leaves, studies, (28) 328. 

 milk, (32) 207. 

 mulberry leaves, (37) 525. 

 muscles of invertebrates, (31) 861. 

 Nebraska soils, (28) 216. 



