154 



TILTH AND TILLAGE 



Flankers. — Sometimes, as in tobacco culture, and m market 

 gardemng, the planker is used when it is desirable to leave the 

 surface particularly even and finely pulverized without firming it 



FiQ 94 — Spring tooth harrow 



(Pig. 95). This tool is usually made out; pf three to four eight- 

 inch or ten-inch planks bolted together with their edges overlapping. 

 The planker is not a compacting implement 



Fig 95.— -Planker 



Rollers and Clod Crushers.— Lumps are easily broken by means 

 of rollers and clod crushers (Fig 97). Very often, after harrowing, 

 the seed bed is too loose or has not suflicient contact with the sub- 

 soil. If such be the case, rolling is necessary to compact the soil. 

 Of all tools used for this purpose there is none better than the cor- 



