XIV CONTENTS 



PAGES 



ways ; Long- and short-course rotations ; Example of 

 rotation ; Problems in rotations ; Conservation of fertility ; 

 Necessity of manures ; Use of crops ; Two systems of 

 farming compared ; Losses of fertility with different 

 methods of farming ; Problems on income and outgo of 

 fertility from farms. 



CHAPTER XIII 



PREPARATION OF SOILS FOR CROPS .... 291-306 



Importance of good physical condition of seed bed ; In- 

 fluence of methods of plowing upon the condition of the 

 seed bed ; Influence of moisture content of the soil at the 

 time of plowing ; Influence upon the seed bed of pulver- 

 izing and fining the soil ; Aeration of seed bed necessary ; 

 Preparation of seed bed without plowing ; Mixing of sub- 

 soil with seed bed ; Cultivation to destroy weeds ; Influ- 

 ence of cultivation upon bacterial action ; Cultivation for 

 special crops ; Cultivation to prevent washing and gully- 

 ing of lands ; Bacterial diseases of soils ; Influence of 

 crowding of plants in the seed bed ; Selection of crops ; 

 Inherent and cumulative fertility of soils ; Balanced soil 

 conditions. 



CHAPTER XIV 



LABORATORY PRACTICE . . . . . 307-326 



General directions ; Note book ; Apparatus used in 

 work ; Determination of hydroscopic moisture of soils ; 

 Determination of the volatile matter; Determination of 

 the capacity of loose soils to absorb water ; Determination 

 of capillary water of soils ; Capillary action of water upon 

 soils; Influence of manure and shallow surface cultivation 

 upon moisture content and temperature of soils ; Weight 



