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Fineness of particles of a soil
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69
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Limit of fineness of soil-particles
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69
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Importance of retentive power
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70
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Power of plants for absorbing water from a soil, experiments by Sachs
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73
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How to increase absorptive power of soils
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74
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Amount of water in a soil most favourable for plant growth
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75
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Hygroscopic power of soils
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75
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Capacity of soils for absorbing and retaining heat
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76
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Explanation of dew
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77
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Heat of soils
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78
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Heat in rotting farmyard manure
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78
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Causes of heat of fermentation
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79
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Influence of colour on heat-retaining power
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80
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Power of soils for absorbing gases
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81
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Gases found in soils
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81
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Variation in gas-absorbing power of soils
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82
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Absorption of nitrogen by soils
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82
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Requirements of plant-roots in a soil
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83
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Influence of tillage on number of plants in a certain area
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86
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Comparison of English and American farming
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86
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II.
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Chemical composition of a soil
|
87
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Fertilising ingredients of a soil
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87
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Importance of nitrogen, phosphoric acid, and potash in a soil
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88
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Chemical condition of fertilising ingredients in soils
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89
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Amount of soluble fertilising ingredients in soils
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90
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Value of chemical analysis of soils
|
90
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III.
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Biological properties of a soil
|
92
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Bacteria of the soil
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92
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Recapitulation of Chapter I
|
96
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APPENDIX TO CHAPTER I.
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NOTE
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I.
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Table of absorptive power of soil substances by Schübler
|
98
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II.
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Table of rate of evaporation of water in different soils by Schübler
|
99
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III.
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Table of hygroscopic power of soils dried at 212° F. (Davy)
|
99
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IV.
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Gases persent in soil
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100
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V.
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Amount of plant-food in soils
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100
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VI.
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Chemical composition of the soil
|
101
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VII.
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Forms in which plant-foods are present in the soil
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107
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CHAPTER II.—FUNCTIONS PERFORMED BY MANURES.
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Etymological meaning of word manure
|
109
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Definition of manures
|
110
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Different classes of manures
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111
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Action of different classes of manures
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113
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CHAPTER III.—POSITION OF NITROGEN IN AGRICULTURE.
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The Rothamsted experiments and the nitrogen question
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