The Bulletin 95 



phoric acid and potash together there was an average annual increase of 

 2.5 bushels peas per acre for the four years in Field C, and 7 bushels for 

 one year in Field A. 



N'itrogen, Phosphoric Acid and Potash, N" P K (Plats 6 and 8). 

 These three materials in a complete fertilizer produced an average in- 

 crease of 2.6 bushels for the four years in Field C, the main increase 

 being the first two years, and 6.6 bushels for the fifth year in Field A. 

 The yields above were a little less than where nitrogen and phosphoric 

 acid alone were combined, shoAving that potash, whether used alone or 

 with other materials, has not added to the production of peas. 



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

 on an average gave an increased yield in peas worth $2 above the cost 

 of the lime. On the plat in Field A as a result of one year's test there 

 was a loss of 3 cents per acre. 



Complete Fertilizer with Lime, N P K L (Plats 9'- and 15). On the 

 plats in one field there was a small increased yield from the use of lime 

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

 field the yield was practically the same where lime was used and where 

 it was not. On an average, the lim.e used with complete fertilizer gave 

 a greater profit per acre by $3.38 than did the use of the complete 

 fertilizer alone. 



The same fertilizers have not increased the yield of peas in the same 

 proportion they did hay. Phosphoric acid was the most important 

 constituent, whether used alone or in combinations ; nitrogen with phos- 

 phoric acid was helpful; nitrogen alone, potash alone, and nitrogen and 

 potash combined were used at a loss. 



Effect of Varying Quantities of Nitrogen. — This part of the experi- 

 ments was planned to determine the effect on the yield of hay of vary- 

 ing quantities of nitrogen, leaving the phosphoric acid and potash con- 

 stant. On one plat the nitrogen was reduced by one-half, making the 

 application iy2 pounds of nitrogen per acre, or 0.7 per cent in the fer- 

 tilizer m.ixture. On two other plats it was increased by two and three 

 times the normal quantity, or 6 and 9 pounds per acre respectively, rep- 

 resenting 3.2 per cent of nitrogen in the fertilizer mixture in the highest 

 application. 



EFFECT OlSr YIELD OF HAY. 



The results during the first four years on plats in Field C showed a 

 profitable increase in the yields of hay from increased quantities of 

 nitrogen, the average profit for the four years from the heaviest applica- 

 tion of nitrogen with constant amounts of phosphoric acid and potash 

 being $9.23 over the cost of the fertilizer application, or $3.95 more 

 than an application of phosphoric acid alone gave, and $3.48 more than 

 potash and phosphoric acid gave. For the one year's results on the 

 plats in Field A the results showed no increase in yields of hay from 

 increased quantities of nitrogen. The most profitable yield on these 

 plats was from the plat receiving one-half the normal quantity of nitro- 

 gen, and the yield on this plat was less profitable than that obtained 

 from phosphoric acid alone. The yield on plat 12 of Field A receiving 

 the highest application of nitrogen, was less profitable than that on the 

 plats receiving phosphoric acid alone and phosphoric acid and potash, 

 by $1.77 and $2.97 respectively. The losses on these plats were very 

 close to the gains on the plats in Field C. 



