|
|
CHAPTER XIX.—COMPOSTS.
|
|
Farmyard manure a typical compost
|
446
|
|
Other composts
|
447
|
|
|
|
CHAPTER XX.—INDIRECT MANURES.
|
|
Lime
|
449
|
|
|
Antiquity of lime as a manure
|
449
|
|
|
Action of lime
|
449
|
|
|
Lime a necessary plant-food
|
450
|
|
|
Lime of abundant occurrence
|
452
|
|
|
Lime returned to the soil in ordinary agricultural practice
|
452
|
|
|
Different forms of lime
|
453
|
|
|
Caustic lime
|
453
|
|
|
Lime acts both mechanically and chemically
|
455
|
|
I.
|
Mechanical functions of lime
|
455
|
|
|
Action on soil's texture
|
455
|
|
|
Lime renders light soils more cohesive
|
457
|
|
II.
|
Chemical action of lime
|
457
|
|
III.
|
Biological action of lime
|
459
|
|
|
Action of lime on nitrogenous organic matter
|
460
|
|
Recapitulation
|
461
|
|
|
|
CHAPTER XXI.—INDIRECT MANURES—GYPSUM, SALT, Etc.
|
|
Gypsum
|
462
|
|
|
Mode in which gypsum acts
|
462
|
|
Salt
|
465
|
|
|
Antiquity of the use of salt
|
465
|
|
|
Nature of its action
|
465
|
|
|
Salt not a necessary plant-food
|
466
|
|
|
Can soda replace potash?
|
466
|
|
|
Salt of universal occurrence
|
467
|
|
|
Special sources of salt
|
468
|
|
|
The action of salt
|
468
|
|
|
Mechanical action on soils
|
470
|
|
|
Solvent action
|
470
|
|
|
Best used in small quantities along with manures
|
472
|
|
|
Affects quality of crop
|
472
|
|
|
Rate of application
|
473
|
|
|
|
CHAPTER XXII.—THE APPLICATION OF MANURES.
|
|
Influence of manures in increasing soil-fertility
|
474
|
|
Influence of farmyard manure on the soil
|
475
|
|
Farmyard manure v. artificials
|
476
|
|
Farmyard manure not favourable to certain crops
|
477
|
|
Conditions determining the application of artificial manures
|
477
|
|
|
Nature of the manure
|
478
|
|
Nitrogenous manures
|
478
|
|
Phosphatic manures
|
480
|
|
Potash manures
|
480
|
|
Nature of soil
|
481
|
|
Nature of previous manuring
|
482
|
|
Nature of the crop
|
483
|
|
Amounts of fertilising ingredients removed from the soil by different crops
|
484
|
|
Capacity of crops for assimilating manures
|
486
|
|
|
Difference in root-systems of different crops
|
488
|
|
|
Period of growth
|
489[Pg xxviii]
|
