4. 



Only the Pcnns^rlvririia farriers rcportoa. the use of a 5-8-8 fortilizor, 

 and in this State 43 of the 97 farncrs interviewed reported its purchase^ 

 Sixt3^-thrco percent of this fertilizer vjas-used on grapes, A 2-8-10 ferti- 

 lizer T7as bought by 31 growers in six of the areas studied. Only 4 percent 

 of the 2-8-lQ fortilizor v/as applied to grapes. Most of the mixed fertilmers 

 used on grapes carried fron 5 to 7 percent armonia. 



The costs of the units of plant food in each of several ready-mixed 

 fertilizers conpared with the costs of the same units of plant food when boug;ht 

 unmixed as sodium nitrate, ammonium sulphate, acid phosphate, and muriate of 

 potash, (table 2.) The som-'co of ammonia in mixed fertilizers is primarily 

 sulphate of ammonia although some nitrate .of soda and organic carriers are 

 also used. Organic amirinnia in animal and vegetable by-products costs more 

 than inorganic ammonia. In computing the cost of plant food uhen purchased as 

 unmixed fertilizers, one half of the ammonia Tns valued at what it would cost 

 in the more expensive nitrate form and one half in the cheaper sulphate form. 



Table S. - Guaranteed analysis of the m.ore important mixed fertilizers 

 and a comparison of the cost of m^ixod fertilizers and the equiva- 

 lent plant food in urnriixed fertilizers, all areas, 1928 













; Cost of 



[Difference in 









: Pore outage 



; Price : 



samx; 



:cost of same 



Guaranteed 



: Farms : 



Quantity 



:of tonnage 



: per ton : 



am^ount of 



: plant fc- od in 



analysis ; 



: using : 



per farm 



: used on 



: of mixed : 



. plant food: 



, mixed and 



1/ ; 





: buying 



;grapes 



: goods : 



. in unmixed; 



; unmixed 













goods 2/ 



: fertilizers 





: Number 



; Tons 



Percent 



: Dollars 



; Dollars : 



: Dollars 



4-16-4 ! 



: 12 : 



: 1.59 



: 



: 41.20 • 



; 36.00 : 



; 5.20 



4-8-10 : 



7 



: 1.71 



18 



38.17 



: 30.88 



: 7.29 



5-8-8 : 



: 43 



: 4*93 



63 : 



42.85 : 



; 31.80 : 



11.05 



4-12-4 : 



17 



3^2 



: 35 : 



36.77 : 



; 30.68 : 



6.09 



7-8-5 : 



: 17 



; 4.49 



: 90 ; 



43.46 : 



34.56 : 



8.90 



E-8-10 



: 31 



1.59 



* 4 



: 35.98 



; 25.36 



10.62 



4-8-7 



: 9 



: 3.49 



: 5 



: 35.94 



: 28ol2 : 



7.82 



7-6-5 



: 24 



5.42 



: 87 



: 42 .'99 ' 



31.90 . ; 



; 11.09 



5-8-5 



: 6 



4.06 • 



: 75 



: 42.18 



: 29o04 : 



13.14 



2-12-2 



: 6 



; ■ 1.96 







: 28.75 



'. <-jO .o<ci 



: 5.43 



4-8-4 



: 22 : 



; 1.76 



: 6 



: 34.88 



: 25.36 



: 9.52 



2-8-5 



: 5 



1.41 



65 



', Ov-^ . (^il^J 



; 20.76 



; 14.46 



2-8-4 



: 8 : 



; 2.18 







32.76 . 



19.84 



: 12.92 



1/ The numbers in the fertilizer analysis refer to porconts. The first number 

 stands for ammonia, the second number for available phosphoric acid, and 



2/ 



the third for potash. 

 At prices given in table 1, 20 pounds of amiiaonia would cost $2.76, if one 

 half of the ammonia iias obtained from sodium nitrate and one half from 

 ammonium sulphate. In the form of acid rrhosphato . 20 pounds of available 

 phosphoric acid would cost §1.33 and in the form of muriate of potash 20 

 pounds of potash, 92 cents. 



