MANURING OF CONTINUOUS CROPS 143 



Again, there are artificial manures which contain two 

 of the ingredients. For instance, phosphatic guano 

 and bone meal contain both phosphates and nitrogen, 

 whilst Peruvian guano and many compound manures 

 contain all three ingredients, and are spoken of as 

 complete manures ; that is to say, they contain, if 

 properly blended, the three ingredients of farmyard 

 manure, and, like farmyard manure, can be con- 

 tinually used, if necessary, on land in conjunction with 

 lime, without the shghtest fear of permanently 

 exhausting the soil, if a suitable rotation of crops is 

 adopted. 



In order that farmers may have a perfectly clear 

 idea of the composition of artificial manures, a matter 

 which every farmer should know as well as he does 

 the days in the week, we will now give a table setting 

 out the approximate percentage of fertilising in- 

 gredients in the chief artificial manures. 



Contents. 



Lime 



20-40 



50 



In addition to the above we have Peruvian Guano 

 and compound manures. The former, through its 

 comparative cost, has largely ^one out of use except 



