32 



most desirable, and this must be determined largely 

 by practical experience and observation. 



In turning under heavy growths of green crops 

 it is especially important that the furrow slice be 

 stood on edge rather than turned flat. Rolling the 

 soil immediately after plowing will be beneficial in 

 that it compacts the vegetable matter and minimizes 

 the harmful influence upon capillarity. 



COMMERCIAL FERTILIZERS 



The use of mineral fertilizers by commercial gar- 

 deners is rapidly increasing every year. The in- 

 crease in the use of these materials is due to the 



SPIKE-TOOTH OR DRAG HARROW 

 With levers for slanting teetii 



increasing difficulty of securing stable manure in 

 the quantities desired, together with the greater 

 ease in handling, as well as the lower cost of actual 

 plant food involved. In many cases the use of com- 

 mercial fertilizers alone has failed to give the results 

 expected, because the grower has been led to believe 

 his soil problem was wholly a chemical one, when, 

 as a matter of fact, in nine cases out of ten, it is 

 largely a mechanical or physical one. No amount 

 of commercial fertilizer on soil in poor physical 



