HARROWING AND ROLLING 105 



pares a fine mulch and leaves an excellent seed bed. 

 It is an excellent harrow to finish off with after 

 using a rolling cutter. 



Chain harrows. The chain harrow consists of a 

 web of chains linked together. They have a won- 

 derful power for breaking clods and are useful for 

 collecting weeds. They shake the dirt from the 

 weeds and roll them into heaps. Chain harrows 

 tend to compact the soil. 



Brush harrows. The brush harrow is a primi- 

 tive form made by fastening brush to a long pole. 

 Brush harrows are quite useful for brushing in 

 seed and for pulverizing manure broadcasted on 

 grass lands. 



Plank harrows. The plank harrow (see Fig. 58) 

 is made of several planks fastened together so that 

 each plank overlaps the next one to it, like the clap- 

 boards of a house. This harrow is as good as a 

 roller in fining and smoothing the surface soil. It 

 is an excellent tool to use alternately with a spike 

 or coulter-toothed harrow on lumpy soil. This tool 

 rasps or grinds many of the lumps or clods which 

 slip by the harrow teeth and presses others into the 

 ground so that the harrow following can get a grip 

 on them. It is a harrow that can be made on any 

 farm. This planker is an excellent tool to smooth 

 the surface, for broadcasting small seeds and for 

 planting truck crops. 



