14 



Soil ' 



(Chapters IV-XXXI.) 



Definition — Nature. 

 Functions. 



Oritrin, 



Properties 



Temperature. 

 •Air. 



Moisture 



Tillage 



Fertilizers 



L>rief geological outline. 

 Weathering of rocks. 

 Accumulation of organic matter. 

 Transformation of organic matter (nitrili- 



cation and denitritication, etc.). 

 Additions from atmosphere. 



Chemical. 



Physical . 



Weight 



Color 



Texture 



Capillarity . . . 

 Permeability. 

 Absorptive 

 power. 



Classification 

 of soils, on 

 the basis of 

 their prop- 

 erties. 



Sources.. 

 Amounts 



AVater tal)le. 



Hygroscopic moisture. 



Pvainfall. 



Irrigation — ^Methods. 



T^ . f Purpose and effects. 



Dramage \ ^^ \ , 



" I Methods. 



Conservati(jn 



Purjxjse 

 effects. 

 Methods. 



/ Definition. 



and 



j Purpose. 

 ■| Methods. 



Chemical. 



Physical. 



Biological. 



^Methods and 

 action. 



effects of 



Chemical. 



Physical. 



Biological. 



Clas- 

 sifica- 

 tion. 



1. According to constituents — 

 a. Nitrogenous. 

 Ii. Phosphoric. 

 <: Potassic. 

 (/. Other amendments. 



2. According to form — 

 a. Green ma- 

 nures. Farm ina- 



li. Animal ma- nures. 



nures. 

 c. Commercial — classify 

 principal forms. 



(Study first the general theory of ferti- 

 lizers according to above scheme and 

 then consider in as much detail as may 

 be deemed desirable different kinds of 

 fertilizers, using Schedule A.) 



