|
Canadian apatite or phosphorite
|
374
|
|
Estremadura or Spanish phosphates
|
375
|
|
Norwegian apatite
|
376
|
|
Charlestown or South Carolina phosphate
|
376
|
|
Belgian phosphate
|
377
|
|
Somme phosphate
|
378
|
|
Florida phosphate
|
378
|
|
Lahn phosphate
|
379
|
|
Bordeaux or French phosphate
|
379
|
|
Algerian phosphate
|
379
|
|
Crust guanos
|
379
|
|
Value of mineral phosphates as manures
|
380
|
|
|
|
APPENDIX TO CHAPTER XII.
|
|
|
|
Imports of phosphates
|
381
|
|
|
|
CHAPTER XIII.—SUPERPHOSPHATES.
|
|
Discovery of superphosphate by Liebig
|
382
|
|
Manufacture of superphosphate
|
383
|
|
Nature of the reaction taking place
|
385
|
|
Phosphates of lime
|
385
|
|
Reverted phosphate
|
389
|
|
Value of reverted phosphate
|
391
|
|
Composition of superphosphates
|
391
|
|
Action of superphosphates
|
392
|
|
Action of superphosphate sometimes unfavourable
|
395
|
|
Application of superphosphate
|
395
|
|
Value of insoluble phosphates
|
396
|
|
Rate at which superphosphate is applied
|
397
|
|
|
|
APPENDIX TO CHAPTER XIII.
|
|
NOTE
|
|
I.
|
The formulæ, and molecular and percentage composition, of the different phosphates
|
398
|
|
II.
|
Reactions of sulphuric acid and phosphate of lime
|
398
|
|
III.
|
Table for conversion of soluble phosphate into insoluble phosphate
|
399
|
|
IV.
|
Action of iron and alumina in causing reversion
|
399
|
|
V.
|
Relative trade values of phosphoric acid in different manures
|
400
|
|
|
|
CHAPTER XIV.—PHOSPHATE OR BASIC SLAG.
|
|
Its manufacture
|
401
|
|
Not at first used
|
403
|
|
Discovery of its value as a manure
|
403
|
|
Composition of basic slag
|
404
|
|
Processes for preparing slag
|
406
|
|
Solubility of basic slag
|
408
|
|
Darmstadt experiments with basic slag
|
410
|
|
Results of other experiments
|
413
|
|
Soils most suited for slag
|
414
|
|
Rate of application
|
414
|
|
Method of application
|
416
|
|
|
|
APPENDIX TO CHAPTER XIV.
|
|
|
|
Analysis of basic slag
|
417
|
|
|
|
CHAPTER XV.—POTASSIC MANURES.
|
|
Relative importance
|
418
|
|
Scottish soils supplied with potash
|
419
|
|
Sources of potassic manures
|
419
|
|
Stassfurt potash salts
|
420
|
|
Relative merits of sulphate and muriate of potash
|
421
|
|
Application of potash manures
|
422
|
|
Soils and crops suited for potash manures
|
423
|
|
Rate of application
|
423
|
|
|
