21 



Results 'of fertilizer experiment tvith cow peas in 1898. 



Fertilizer. 



Plot No. 





Per 

 acre. 



Kind. 



Yield of 



seed per 



acre. 



1 

 3 



Lbs. 



240 



51 



00 



\240 



"/ 51 



[Acid phosphate... 

 [Muriate of potash 



iNo fertilizer 



JAcid phosphate. . . 

 [Muriate of potash, 



Av. 

 Av. 

 Av. 

 Av. 



6 



7 

 8 



9 



10 



3 & 8 



1 & 7 



2 & 10 



( 240 jAcid phosphate. . . 

 51 ^Muriate of potash. 

 Nitrate of soda . . 

 Acid phosphate. . . 

 [Muriate of potash . 

 Acid phosphate. . . 



No fertilizer 



Acid phosphate . . . 

 y\ uriate of potash . 

 Muriate of potash 



No fertilizer 



Acid phosphate. . . . 

 Mariate of potash, 



i 80 



j 210 



1 51 



240 



00 



r240 



'( 51 



51 



00 



2-10 



51 



4. 6 & 9 I Phosphate and muriate. 



Bus. 



13.9 

 15.9 



16. 



15.4 



19.1 



16.7 



15.2 

 14.3 



14.9 



15.1 

 15.1 

 14.1 

 14.5 

 .3 



1.^ 



Apparently none of the mineral fertilizers was de- 

 cidedly advantageous., though with the complete fertil- 

 izer there was an increase of four bushels per acre. The 

 failure of acid phosphate and muriate of potash to in- 

 crease the yield is surprising, and the only explanation 

 we can suggest is the fact that both phosphate and 

 potash salts had \jeen liberally used on this field during 

 each of the preceding five years, and probably these ma- 

 (terials had Ijeen applied annually for about fifteen years. 

 This view implies that even on this gray light sandy soil, 

 containing some flint stones, and underlaid by a rather 

 stiffer sandy sub-soil, acid phosphate and potash are 

 not wholly used up or lost during the jesir when they 

 are applied but exert a considerably residual or cumu- 

 lative effect. 



