AGRICULTURAL EXPERIMENT STATION. 



25 



The quantities stated are the total cro[) harvested iu eight years. 

 Another arrangement of figures is necessary to show whether 

 the increased yield occurred with all crops alike is only with cer- 

 tain ones. With the exception of the hay, only those crops are 

 given in Table 5 which were the first ones grown after the applica- 

 tion of the fertilizers. 



TABLE V. 



Excess of yield over plots not fertilized. 



ii 



OS 



rri . 



X CO 



1— 'Xj 



X*. 



k 



2,236 



1,400 



—132 



444 



1,020- 



1,756 



566 



234 



516 



931 



1,3S8 



1,100 



- 



356 



681 



836 



700 



—332 



16 



510 



-^^ 



Complete fertilizer, phosphoric acid 

 dissolved 



Complete fertilizer, phosphoric acid 

 from ground bone 



Complete fertilizer, phosphoric acid 

 from crude South Carolina rock 



^Nitrogen and potash ■without phos- 

 pliorici-acid 



2,004 

 2,092 

 1,750 

 1,049 



* Fertilizers applied in 1SS9, and land summer fallowed. 

 t rield of dry matter. 



In the light of the facts here presented it is necessary to admit 

 that the water-insoluble forms of phosphoric acid have been 

 utilized by at least three species of farm crops. 



THE EFFECT OF PARTIAL AND COMPLETE FERTILIZERS. 



It has for some time been well enough established that under 

 average conditions a complete fertilizer, viz : one containing com- 

 pounds of nitrogen, phosphoric acid and potash causes a larger 

 increase of crop than a fertilizer containing only one or two of 

 these ingredients. It is equally plain that one ingredient often has 

 a preponderating influence, and more often two of these ingredients 

 combined are nearly as useful as the three. Unfortunatelj^ the 

 results of experiments in a particular locality do not with any 

 certainty apply to any other locality as indicating the special needs 

 of the soil, and these experiments at the College were not under- 

 taken with the idea of establishing formula? of general use in the 

 State. 



It seemed desirable, however, to ascertain what would be the 

 outcome of fertilizing continuously with partial fertilizers in a soil 

 that has seemed to especiall}' need the mineral ingredients. This 

 can be seen in Table VI. 



