The Bulletin. 25 



HAY. 



These experiments were planned to determine the effect on the 

 yield of hay of varying quantities of nitrogen, leaving the phos- 

 phoric acid and potash constant. On one plat the nitrogen was re- 

 duced by one-half, making the application 11/^ pounds of nitrogen 

 per acre, or practically one-half of 1 per cent in the fertilizer mix- 

 ture. On two other plats it was increased by two and three times 

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

 senting o per cent of nitrogen in the fertilizer mixture in the 

 highest application. 



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 being $7.04 over 

 the cost of the fertilizer application, or $2.84 more than an applica- 

 tion of phosphoric acid alone gave, and $2.52 more than potash and 

 phosphoric acid gave. For one year 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 nitrogen, and the 

 yield on this plat was less profitable than that obtained from phos- 

 phoric acid alone. The yield on the plat (12) receiving the highest 

 application of nitrogen was less profitable than that oii the plats 

 receiving phosphoric acid alone and phosphoric acid and potash, by 

 $1.92 and $2.82 respectively. The losses on these plats were very 

 close to the gains on the plats in Field C. 



The four years' experiments, represented on these latter plats, 

 taking the results as a whole, show some profit, as is shown in the 

 yield of hay from the increased quantities of nitrogen, though it is 

 small over the profits produced by phosphoric acid alone. 



PEAS. 



The yield of peas presented in Table IV are from the same plats 

 as the hay results shown in Table III, the peas having been gathered 

 on one-half the plats and the hay on the other half. The experi- 

 ments were intended, as were those with hay, to show the effect of 

 varying quantities of nitrogen on the yield of peas, the phosphoric 

 acid and potash remaining constant. The results show that the 

 most profitable yields on the plats in both fields were where one- 

 half the quantity of nitrogen was applied, or about one-half of 1 

 per cent in the fertilizer mixture, and the profits on these plats 

 were but slightly in excess of those where phosphoric acid alone 

 and where phosphoric acid and potash were applied. The large ap- 

 plication of nitrogen gave less profitable yields than phosphoric acid 

 alone. 



On the whole, the results are unfavorable to the application of 

 nitrogen. 



