BREAKING THE VIRGIN PRAIRIE 125 



ing-rooted grasses; plowing once will be successful in 

 the latter respect only in proportion to the dryness of 

 the season. In other words if the season is a wet one, 

 the perennial plants are not likely to be eradicated by 

 plowing once. It is apparent, therefore, that the 

 specific practices to be followed must be determined by 

 the local and seasonal conditions of soil and climate. 



It is, however, always a good policy to plan to get rid 

 of creeping-rooted plants the year the breaking is done 



30t>u. 



271*1. 



22. bu. 



17. bu. 



15. bu. 



JUNE 10 



SEPT. IO. 



APRIL. 



Fig. 46. June Breaking Pays in the Dry Belt. 



This chart illustrates the average yield secured on breaking done during 



June, July, August and September and the following spring on a clay loam 



soil in West Central Saskatchewan. 



if at all practicable, otherwise they will be a drain on 

 the productiveness of the land and in any case will have 

 to be eradicated later at probably an added cost. As a 

 rule if creeping-rooted plants are present and known to 

 be difficult to eradicate, breaking and backsetting is to 

 be recommended ; if they are not present or are found in 

 such small numbers that they are not difficult to control, 



