250 



INDEX 



Distribution of alkali, 6 



Dorscy, C. W., 20, 32, 147, 148, 151, 



166, 221, 238 

 Drain outlets, 188 

 Drainage: 



advantages of, 167, 169 



cost of, 189 



for reclamation 162, 167 



machines, 186, 187 

 Drains: 



carrying capacity of, 180 



size of, 178 



types of, 171 ^ 

 Duggar, B. M., 40 

 Dwarf samphir, as alkali indicator, 



63,66 



Dymond, T. S., 213, 221 

 Dynamite in breaking hardpan, 123 



Earth's crust, composition of, 18 

 Eaton, F. M., 239 

 Eckart, C. F., 221, 238 

 Economic factor in: 

 crop choice, 195 

 judging land, 243 

 Effect of: 



alkali on: 



ammonification, 138 

 bacteria, 132 

 capillarity, 128 

 colloids, 122 

 germination, 36 

 nitrogen fixation, 137 

 plant structure, 38 

 soil tilth, 120 

 surface tension, 128 

 salts on: 



evaporation, 130 

 moisture movement, 128 

 soil organisms on sterility, 133 

 water-table, 145 

 Egypt, alkali in, 10, IT , 



Egyptian: 



clover, 200 



millet, 208 



Electric bridge method, 94 

 Emmer, 214 

 English rye grass, 204 

 Equilibrium: 



chemical, 105 



in soil solution, in 

 Eucalyptus, 220 

 Europe, alkali in, 13 

 Evaporation : 



of moisture, 130 



of saline lakes, 27 



reduction of, 155 

 Experiments: 



in loam, 53 



in sand, 49 



with rice, 114 



with sodium sulphate in Calif., 



108 

 Extract of soil, 81 



Factors affecting resistance, 192 



Failyer, G. H., 82, 104 



False golden rod, as alkali indicator. 



73 



Fescue, 204 

 Fiber crops, 218 

 Field peas, 200 

 Flax, 218 

 Flocculation of soil, effect of alkali, 



121 

 Flooding to reclaim land in Egypt, 



1 60 



Forage crops, 197 

 Forbes, R. H., 229, 238 

 Formation of: 



black alkali, 108 



carbonates, 28 



hardpan, 123 



nitrates, 30 



