304 PEAR GROWING IN CALIFORNIA 



will have to be determined by trial and will depend on the kind of 

 soil to be treated. Prom one-half to one stick of 25 per cent strength 

 dynamite, exploded from two to three feet below the surface, is effective 

 in the majority of our soils. The work of dynamiting must de done, 

 in heavier soils at least, when there is a minimum amount of moisture 

 present, or else the soil may be packed and the object for which the 

 dynamite was used may be defeated. A liberal charge in the bottom 

 of holes being dug will loosen the soil sufficiently deep so that drainage 

 conditions will be greatly benefited. On some of the California soils 

 where a hardpan exists within two or three feet of the surface, 

 or where soils are abnormally hard, dynamiting is a necessity and 

 should never be neglected. On the other hand our river bottom soils, 

 with their looser texture, greater depth, and perfect underdrainage do 

 not require the use of dynamite. 



