The Bulletin. 31 



The most profitable yields on the plats in Field C were from the plat 

 receiving two quantities phosphoric acid or the equivalent of 342 

 pounds of acid phosphate per acre, while the most profitable return 

 from the plats in Field x\ are from the one having three quantities 

 of phosphoric acid or the equivalent of 514 pounds acid phosphate 

 per acre, the profit in these cases being $6.13 and $16.11 per acre 

 respectively. 



The results, as a whole, show in the most striking way the need of 

 this soil for phosphoric acid in the growth of pea-vine hay. 



PEAS. 



The pea yields in Table VIII are from the same plats as the hay 

 yields presented in Table VII. The results point to the same conclu- 

 sions as for hay, the most profitable results coming from two quanti- 

 ties of phosphoric acid on the plats in Field C and three quantities 



from the plats in Field A. 



HAY. 



The tests, the results of which are presented in Table IX, were 

 made to see what effect lime alone and lime in combination with the 

 three fertilizer constituents — nitrogen, phosphoric acid, and potash — 

 in normal quantities would have on the yield of hay. The lime was 

 applied every fourth year at the rate of 500 pounds rock or 1,000 

 pounds slaked lime per acre. 



Lime alone, L (Plats 7^ and 14). On the plat in Field C lime 

 alone gave a profitable yield of pea-vine hay in the four years' test, 

 the average increase being worth $2.70 per acre. On the plat in 

 Field A in one year's test there was no increase in yield over the un- 

 fertilized plat, and the lime was therefore used at a loss. 



Lime with Complete Fertilizer, ISF P K L (Plats 9^ and 15).. 

 Where lime was used in combination with the three fertilizer con- 

 stituents there was a slight increase over what the complete fertilizer 

 alone gave, but not sufficient to make the profit any greater than was 

 obtained from the three fertilizer constituents by themselves. 



Taken as a whole, lime was of doubtful value in increasing the 



yield of pea-vine hay. 



•^ ^ PEAS. 



The pea yields presented in Table X were obtained from the 

 same plats as the hay yields recorded in Table IX preceding. The 

 experiments were planned to test the effect of lime alone and lime 

 with complete fertilizer on peas, as stated for hay above. On one 

 series of the plats lime alone gave a small profit, while on the other 

 series there was just about a corresponding loss. On the plats in 

 one field there was an increased yield and profit from the use of 

 lime in connection with a complete fertilizer, while on the plats in 

 the other field the profits were practically the same where lime was 

 used and where it was not. 



