So important is the proper supply of water and food in the
growth of a plant that, in a given soil, the crop yield is usually
in direct proportion to the development of the root system. Whenever
the roots are hindered in their development, the growth of the plant
above ground is likewise retarded, and crop failure may result. The
importance of roots is not fully appreciated because they are hidden
from direct view. Successful dry-farming consists, largely in the
adoption of practices that facilitate a full and free development-of
plant roots. Were it not that the nature of arid soils, as explained
in preceding chapters, is such that full root development is
comparatively easy, it would probably be useless to attempt to
establish a system of dry-farming.
Kinds of roots
The root is the part of the plant that is found underground. It has
numerous branches, twigs, and filaments. The root which first forms
when the seed bursts is known as the primary root. From this primary
root other roots develop, which are known as secondary roots. When
the primary root grows more rapidly than the secondary roots, the
so-called taproot, characteristic of lucerne, clover, and similar
plants, is formed.
Pages:
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84