INDEX 



651 



New Jersey, pot-culture experiments, 439 



soil, 138 



New York, investigation of phosphorus in 

 wheat bran, 41 



soils, 75 



Nitrate of calcium, 526 

 Nitrate of sodium, 525 

 Nitrification, 195 

 Nitrogen, 36 



Nitrogen and organic matter, 194 

 Nitrogen determination, 629 



fixation by legumes, 207 



by nonsymbiotic bacteria, 224, 405, 



437 



from air and soil, 213 



gain or loss difficult to determine, 499 



in animal and plant products, 154, 602 



in drainage waters, 557, 563 



in fertilizers, 157, 517 



in rain, 309 



in roots and tops of legumes, 218 



in sweet clover, 220 



recovered in live-stock farming, 201 



retained by animals, 201 



used in different amounts, 374, 423 



used to give crops a start, 218, 401, 533 

 Nitrogenous compounds, 38 

 Nomenclature, 19, 565, 599 

 North Carolina soils, 138, 142 

 North Dakota investigations of flax sick- 

 ness, 319 



North Platte, Nebraska, rainfall, 331, 580 

 Northern states soils, 97, 138 

 Nuclein, 40 



Oats, composition, 75, 154, 603 



statistics, 615 

 Ocean, composition, 13 

 Ohio, field experiments, 245, 299, 441 



investigations with manure, 547 



soils, 88, 138 



in pot-culture experiments, 513 

 Oil cakes, composition, 604 



fertility loss, 205 



statistics, 626 



Oil seeds, composition, 603 

 Oils and fats, 34 

 Oregon soils, 102 

 Organic chemistry, 30 

 Organic matter, defined, 30 



decomposition, 195 



loss in digestion, 199 



methods of supplying, 198 

 Organic matter and nitrogen, 194 

 Orthoclase, 47 

 Oxids, defined, 17 



occurrence, 53 

 Oxygen, 26 



Pacific coast soils, 102, 130, 138 



Park field, Rothamsted, 391 



"Parrot" instruction, 292 



Pasturing land, 199 



Peat, dried, 524 



Peat soils, 75, 83, 98, 100, 470 



Pennsylvania, field experiments, 263, 420 



investigations with manure, 202, 203 



soils, 76, 142 

 Pentosans, 31 



Periodic law of chemical elements, 9 

 Permanent systems of agriculture, 159 

 Peter, on soil fertility theories, 339 

 Phosphate deposits, 597 

 Phosphate experiments: 



Canada, 505 



Illinois, 283, 504 



Indiana, 296 



Kentucky, 288 



Maine, 275 



Maryland, 261 



Massachusetts, 278 



Ohio, 245, 442, 448, 452 



Pennsylvania, 263 



Rhode Island, 266 

 Phosphate production, 595 



raw rock and slag must be fine-ground, 



2 39 



in practical agriculture, 289, 504 

 Phosphate report by National Fertilizer 

 Association, 292 



spreader, 179 



supply, 597 

 Phosphates, 52, 186 



low-grade, 188, 242, 598 



natural, 52, 186 



used in Europe, 324 

 Phosphatic limestone, 52 



marl, 241 



slag, 192 



Phosphorus, 40, 52, 183, 236 

 Phosphorus compounds, 189 



determination, 630 

 'in fertilizers, 157, 517 



in plant and animal products, 154, 602 



in wheat bran, 41 



production, 595 



retained by animals, 201 



supply, 597 



use in different forms, 237 



used in Europe, 324 

 Photosynthesis, 29 

 Physical condition of soil, 576 

 Piedmont soils, 121, 138 

 Plant and animal products, composition, 



157, 602 

 Plant food, 26 



available, 107, 314, 366 



