Even greater differences exist between other plants. This is one of
the interesting subjects yet to be investigated by those who are
engaged in the reclamation of dry-farm districts. Moreover, the same
crop grown under different conditions varies in its rate of
transpiration. For instance, plants grown for some time under arid
conditions greatly modify their rate of transpiration, as shown by
Spalding, who reports that a plant reared under humid conditions
gave off 3.7 times as much water as the same plant reared under arid
conditions. This very interesting observation tends to confirm the
view commonly held that plants grown under arid conditions will
gradually adapt themselves to the prevailing conditions, and in
spite of the greater water dissipating conditions will live with the
expenditure of less water than would be the case under humid
conditions. Further, Sorauer found, many years ago, that different
varieties of the same crop possess very different rates of
transpiration. This also is an interesting subject that should be
more fully investigated in the future.
Ninth, the vigor of growth of a crop appears to have a strong
influence on transpiration.
Pages:
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179