The Bulletin. 37 



The experiments represented bj plats 10^, 11^, 12^, 13^ in Field C 

 were intended to show the effect of increasing the potash and phos- 

 phoric acid respectively when only these two constituents were used. 

 The results show no increase of profit from increasing the amount of 

 potash and none from increasing the phosphoric acid when potash 

 alone was present over what the normal amount of phosphoric acid 



and potash (P K) gave. 



HAY. 



Experiments in Table XI were planned to show effect of increas- 

 ing and decreasing the normal (E" P K equals 300 pounds of a fer- 

 tilizer mixture containing 8 per cent phosphoric acid, 4 per cent of 

 potash, and 1 per cent nitrogen) fertilizer application on the yields 

 of hay and peas. The applications were at the rate of 150 pounds 

 per acre, y? (N P. K) ; 300 pounds per acre, N P K; 450 pounds 

 per acre, 41/2 (N P K) ; 600 pounds per acre, 2 (N P K) ; and 900 

 pounds per acre, 3 (N P K). The results show an increased yield 

 of hay for the increased applications on the plats in Field A, the 

 greatest average profit coming from the application of 300 pounds of 

 fertilizer per acre; while on plats in Field C 600 pounds per acre 

 gave the most profitable yields, though these applications did not give 

 as large and profitable yields as smaller quantities of fertilizers con- 

 taining larger amounts of phosphoric acid, as showm in Table VII. 



The pea yields presented in the Table XII are from the same plats 

 as the hay yields in Table XI, and show the effect of varying amounts 

 of the normal fertilizer application. The most profitable yields were 

 obtained on both fields from the plats receiving 600 pounds of the 

 normal fertilizer application. 



GENERAL SUMMARY OF RESULTS OF FERTILIZER TESTS. 



1. The same fertilizers did not increase the yield of peas in the 

 same proportions they did hay. The profits were therefore not as 

 gTeat from fertilizing peas for pea yields as for hay. It is to be re- 

 membered, however, that where there was an increased yield and 

 profit from the use of fertilizers, that the peas only were removed and 

 the increased yield of hay was left on the land to increase its fertility. 

 Taking these two factors into consideration — the yield of peas and 

 improvement of soil from the extra growth of vines and stubble left 

 on the land — the increase in yield and profits were the same. 



2. For the production of hay, nitrogen alone, potash alone, and 

 nitrogen and potash combined, produced small increase in the yields 

 of hay over the plats receiving no fertilizer. For the production of 

 peas these two constituents used alone and in combination with each 

 other were at a loss. 



On the whole, it may be therefore said that nitrogen alone and 

 potash alone and nitrogen and potash combined with each other have 

 little or no value in the growth of peas on this land. 



