TABLE OF CONTENTS xi 



CHAPTER VII. 



PRINCIPLES OF MANURING. 



Definition of manure. Functions of manures. Adaptation to circum- 

 stances. Requirements of soils : Too rich soils Determination 

 of requirements Eight-plot test Wire-basket method 

 Chemical analysis. Requirements of crops: Chemical composi- 

 tion Classification of crops Cereals and grass Roots Potatoes 

 Leguminous crops Garden crops. Classification of manures 



p. 178 



CHAPTER VIII. 



PHOSPHATIC MANURES. 



Native phosphates : Use as manure General properties Production 

 and imports Apatites and phosphorites Coprolites Phosphatic 

 guanos. Superphosphates : Manufacture Composition and value 

 Reverted phosphates Manurial action Effects of mixing with 

 other manures. Basic slag : Source Composition Basic 

 character Manurial effects Compared with superphosphate 

 Application Mechanical condition Adulteration Artificial 

 basic slags Precipitated phosphate . . . . . p. 206 



CHAPTER IX. 



PHOSPHO-NITROGENOUS MANURES. 



Imports Composition Methods of treatment Crushed 

 bones Steamed bones Bone-ash Bone-char Dissolved bones. 

 Meat meals. Fish guanos p. 237 



CHAPTER X. 



NITROGENOUS MANURES. 



Organic nitrogenous manures Leather Hoof and horn meals 

 Woollen rags and shoddy. Sulphate of ammonia : Production- 

 Composition and properties Adulteration Manurial value 



