|
|
|
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
|
|
|
|
CHAPTER XVI.—MINOR ARTIFICIAL MANURES.
|
|
Scutch
|
427
|
|
Shoddy and wool-waste
|
427
|
|
Soot
|
428
|
|
|
|
CHAPTER XVII.—SEWAGE AS A MANURE.
|
|
Irrigation
|
431
|
|
Effects of continued application of sewage
|
433
|
|
Intermittent irrigation
|
434
|
|
Crops suited for sewage
|
434
|
|
Treatment of sewage by precipitation, &c.
|
436
|
|
Value of sewage sludge
|
439
|
|
|
|
CHAPTER XVIII.—LIQUID MANURE
|
442
|
