350 



INDEX 



Vegetables, see Garden 



Velvet bean, 114 



Vetch, 114 



Ventilation, 246, 258, 272, 290, 311 



Water, absorbing organs, root-hairs, 

 5; amount in soil, 15; amount 

 used by plants, 3; capillary or film, 

 3, 14, 15; control by drainage, 21; 

 drainage in sandy soils, 17; effect 

 on soil, 10 ; free, 14; how bring to 

 surface of soil, 20; how held in soil, 

 14, 19; how plants get, 4; influ- 

 ence on soil bacteria, 14, on soil 

 temperature, 13; kinds, 19; losses 

 from soil, illus., 19; movement in 

 soil, 17, 19; needed in soil, 12; path 

 in plant, 2; percolation, 19; 

 plants need, 2; properties of, 12; 

 relation to plant growth, illus., 3; 

 to root-hair, illus., 18; soil 

 particles, 12; to soil tempera- 

 ture, 13; solvent power, 24; sup- 

 ply for home, 313; table, 16, 17; 

 upward movement in soil, 17 



Weeds, 173-179; control of, 62, 177, 

 178; definition of, 173; effect on 

 crop production, 173; illus., 174, 

 175; hosts for fungi, 166; losses 

 due to, 173; protecting crops from, 

 71; seed dispersal, 176; why suc- 

 cessful, 174-176 



Wheat, 90-97; cost of production, 97; 

 destruction of barberry for rust 

 control, 165; diseases of, 95; dis- 

 tribution map, 90; improvement 

 by selection, 159; influence of 



climate on, 90; insects injurious to, 

 95; methods of harvesting, 96; 

 production and value, 89; rela- 

 tion to system of farming, 91; 

 seed bed, 95; seed selection, 94; 

 soil suited for, 91; time of sowing, 

 95; types, illus., 94 



White grub, 181, 188 



Wilt, 170 



Wire worm, 181, 189 



Yard, farm, 316, 317 

 Y. M. C. A., rural, 326 



