Transpiration as a Factor in Crop Production. 5 
PAGE 
Relation of available soil-moisture content to growth 
and water requirements of corn 127 
Plan of the experiments 127 
Degrees of soil moisture maintained 127 
Discussion of results 129 
Effect of deficiency of soil moisture 131 
Effect of an overabundance of soil moisture. . . 141 
Effect of increasing the fertility of soils differing 
in moisture content 142 
Relation of soil fertility to growth and water require- 
ments of corn 143 
Results of the two soil fertility experiments — 1911 
and 1914 145 
Discussion of results 153 
Effect of prolonged confinement in cans of soils dif- 
fering in fertility. 157 
Influence of acclimatization, variety, and kind of crop 
upon the transpiration relationships 159 
Acclimatization 159 
Difference in growth habits 166 
Erectness of leaves 167 
Special drouth-resistant corn 167 
Sorghums 168 
Weeds 169 
Relation of ash content to transpiration under various 
conditions of growth 170 
. Effect of climatic differences upon relation of tran- 
spiration to ash content 170 
Effect of differences in soil fertility upon relation 
of transpiration to ash content 175 
Effect of a difference in soil moisture content upon 
relation of transpiration to ash content 180 
Effect of size of potometer upon relation of tran- 
spiration to ash content 180 
Effect of kind of crop and variety upon relation of 
transpiration to ash content 182 
Correlative responsepf leaf structure and transpiration, 
as related to variety, acclimatization, and soil con- 
ditions 184 
Tissues concerned in the transpiration current of corn ... 188 
Technique 188 
Tissue structure 189 
Part III. Application 200 
Literature cited 209 
