CONTINUOUS CROPPING ROTATIONS 195 



We shall now proceed to study different rotations 

 suitable for the different types of existing climatic 

 conditions. As already indicated, we can classify 

 different types of rotations under three heads: — 



ROTATIONS BASED ON RAINFALLS 



Class 1. Rotations designed for the production of 



fodder and forage for animal consumption. 

 Class 2. Rotations in which the production of 



animal food is combined with the growing of food 



for direct human consumption, e.g., cereals and 



potatoes. 

 Class 3. Rotations primarily intended for the 



production of human food for direct consumption. 



Generally speaking, Class 1 rotations are recom- 

 mended for areas with an annual rainfall of over 

 35 inches; Class 2 for areas with an annual rainfall of 

 from, say, 28 inches to 35 inches; and Class 3, rota- 

 tions for areas with less than 28 inches annual rain- 

 fall. 



It must, however, be borne in mind that a 25 inch 

 annual rainfall on heavy soils may retard tillage opera- 

 tions to a greater extent than on a lighter or easier 

 worked soil. In other words, the farmer must regard 

 the recommendations made as being of a general 

 nature and the rotations are given merely to act as a 

 guide. 



WANTED — MORE RESEARCH 



Possibly some day the recommendations which the 

 writer has frequently made to the authorities will be 

 carried out, viz., to obtain statistics with a view to 

 ascertaining the average number of days throughout 

 the year that climatic conditions permit of carrying 



