FIELD ROOT CROPS. 



wurzels, sugar-beets and carrots. It is advisable to 

 have swedes follow a clover sod which has been 

 thoroughly decomposed and which has been manured 

 in the fall or during the winter with about fifteen 

 waggon loads of farm manure per acre, thoroughly 

 incorporated with the surface soil. Before making 

 the drills, if the subsoil is clay it should be loosened 

 about ten inches deep with a subsoiler (///. /) . 



125 



65. HORSE DRILL FOR SOWING FIELD ROOT SEEDS. 



In order to do the work thoroughly it is advisable 

 to first set the subsoiler eight inches deep, then across 

 about two inches deeper. This method is most 

 thorough. The next proceeding is to harrow and 

 roll the land before making the drills, which are 

 made the same as for mangel-wurzels, shallow, and 

 twenty-eight or thirty inches wide. The time to 

 sow swedes is from fifteenth to the twenty-fifth of 

 June. If sown earlier they are liable to be more 

 woody and are subject to the turnip louse {aphis). 

 The quantity of seed necessary is from two to 



