Rotations, Manuring and Fertilizing 65 



deficient in nitrogen and phosphoric acid but appHcations 

 of fertilizers after the plants are established give poor 

 results. It is preferable to maintain the nitrogen con- 

 tent by the use of green-manures. W. H. Chandler recom- 

 mends that on all but the richest soils 250 to 300 pounds 

 of acid phosphate or steamed bone-meal be used, 

 preferably one year before the crop is harvested, and 

 that no nitrogen or potash be applied.^ 



Very little fertilizer is used west of the Mississippi 

 Valley, and almost none in the irrigated districts, unless 

 the land is cropped in strawberries continuously. Some 

 Oregon growers use a mixture of three parts wood ashes 

 to one part ground bone, and a 3-6-9 fertilizer is used 

 occasionally, at the rate of 500 to 800 pounds an acre, 

 especially on the older beds. 



1 Bui. 113, Mo. Exp. Sta. (1913). 



