Til lay e to Destroy Weeds. 



so much more cheaply and rapidly with the broad light 

 harrows and weeders than it can later with the cultivator. 



274. Weed Seeds Do not All Germinate at Once It must 

 be remembered in handling soils to kill weeds that the seeds 

 do not all germinate at once. The first harrowing which is 

 done to kill weeds may itself bring up from below seeds 

 which were too deep in the ground to grow or it may cover 

 some seeds which were lying upon or too close to the sur- 

 face to germinate, hence frequent cultivations for hoed 

 crops are needful. 



275. The Best Tools for Weed Killing. The tool which 

 will do the most effective service in killing weeds depends 

 upon the character and condition of the soil and the size of 

 the weeds. When they are not yet fairly out of the ground 

 or are just coming up and before a root system has been de 

 veloped there is no tool equal to a medium weight or light 

 spike-toothed harrow represented in Fig. 62a. The stiffer 

 and more compact the soil is the heavier should be the har- 

 row or rather the deeper it should be run in the ground. 



Fia. 62a. Tilting harrow, best tool for killing young weeds. 



The tilting harrow, constructed so that the teeth may be 

 inclined forward or backward, is one of the best forms as, 

 with this arrangement, it may be made to run deep or shal- 

 low as desired. 



On sandy soils and other soils when very loose the form 

 of tool represented in Fig. 63 may be used to kill very 



