-13- 



C, PLAiiTlNG STOCK. (Plants set by the nursei^nnan to produce plants to sell to 



berry growers as "essentially" virus-free.) 



1, Isolate the planting as far as possible from all other strawberries, both 

 cultivated and vrild. A distance of 3000 feet is very desirable, 



2, The field must have no history of red stele or other soil-borne disease. 



3, The plants used diould be no more than one year removed from an approved 

 source of Foundation Stock , i.e., should have been grown as outlined under B. 



kt The planting (and all nearby strawberry plants) should be protected fully, 

 throughout the season, by dusts or sprays as recommended to control aphids, 



D. ADVERTISING AND PROi'DTION 



1, Plants produced as outlined above should be "essentially" virus-free and 

 should be sold as such, 



2, Varieties for which virus-free strains are not available should not be sold 

 as virus-free, 



J, S. Bailey 



//////////////// 



HCW TO FIGURE THE AJC'TOT OF FERTILIZER TO APPLY 



In the past when orchard fertilization was discussed the orchardist heard — - 

 "You should apply so many pounds of ammonium nitrate, urea, 5-10-10 or some other 

 fertilizer". Since there are so many fertilizers now being sold, it is more logical 

 when discussing fertilizer needs to talk in terms of actual nitrogen, potash (K2O) 

 and phosphoric acid (P20^), It has been noted, however, that this has been confus- 

 ing to some growers -vihen they try to figxire how much of a nitrogenous fertilizer or 

 a "complete" fertilizer should be applied to equal a certain amount of actual nitrogen, 

 potash or phosphoric acid. Therefore, it is hoped that the following discussion 

 will eliminate some of the misunderstanding. 



In our fertilizer recommendations we state that a tree capable of producing 

 25 bushels of apples should receive approximately one pound of actual nitrogen. 

 If we are going to use some conmon nitrogenous fertilizer how many pounds must be 

 applied to equal a pound of actual nitrogen? To determine this, divide the actual 

 amount of nitrogen needed by the per cent nitrogen in the nitrogenous fertilizer. 

 For example if you are using a nitrogenous fertilizer containing 33 per cent N, 

 divide 1,0 pound by ,33 which vrill give an answer of approjdraately 3 pounds of the 

 nitrogenous fertilizer that a:ust be applied to be equivalent to 1.0 pound of actual 

 nitrogen. 



Similarly, suppose you want toapplj'1,5 pounds of actual nitrogen and you are 

 using a nitrogenous fertilizer containing U5 per cent N, divide 1,5 pounds by ,U5 

 which will give an ansvfer of approximately 3.3 pounds of the nitrogenous fertilizer 

 to be equivalent to 1,5 pounds of actual nitrogen. 



Suppose you are using a 5-10-10 fertilizer, how many pounds must be applied 

 to equal one pound of actual nitrogen? Hov/ many pounds of potash and phosphoric 

 acid iTill be added when enough 5-10-10 is added to equal one pound of actual nitrogen? 



