The Bulletin. 23 



PEAS. 



The yields of peas presented in the above table (II) were obtained 

 on the same plats as the hay in Table I, the hay being cut on one- 

 half of each plat and the peas gathered on the other half. 



Nitrogen, JSF (Plats 1 and 1). After the first year (1904) nitro- 

 gen alone gave no material increase in the yield of peas ; in two years 

 (1906 and 1907) there was a decided decrease. 



Potash, K (Plats 3 and 3). Potash alone did not increase the pea 

 yields, the net result being a small loss in yields and the loss of the 

 cost of the fertilizer application. 



Nitrogen and Potash, N K (Plats 5 and 6). Nitrogen and potash 

 combined did not help the yield of peas, and the cost of the fertilizer 

 was lost. 



Phosphoric Acid, P (Plats 2 and 2). Phosphoric acid alone gave 

 an annual average increase of 2 bushels of peas per acre for the 

 four years' test in Field C and 5 bushels for the fifth year in Field A. 



Nitrogen and Phosphoric Acid, N P (Plats 4 and 5j. Phosphoric 

 and nitrogen combined increased the yield of peas in each of the 

 tests, the annual average for the four years in Field C being 3.1 

 bushels, and for the fifth year in Field A 7.2 bushels. These were 

 the largest and most profitable increases obtained from any of the 

 fertilizer applications. 



Phosphoric Acid and Potash, P K (Plats 12^ and 7). From phos- 

 phoric acid and potash together there was an average annual increase 

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

 one year in Field A. 



Nitrogen, Phosphoric Acid and Potash, ISF P K (Plats 6 and 8). 

 These three materials in a complete fertilizer produced an average 

 increase of 3.1 bushels for the four years in Field C, the main in- 

 crease being the first two years, and 6.6 bushels for the fifth year in 

 Field A. The yields above were not greater than where nitrogen and 

 phosphoric acid alone were combined, showing that potash, whether 

 used alone or with other materials, has not materially added to the 

 production of peas. 



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

 same proportion they did hay. Phosphoric acid was the most impor- 

 tant constituent, whether used alone or in combinations; nitrogen 

 with phosphoric acid was helpful ; nitrogen alone, potash alone, and 

 nitrogen and potash combined were used at a loss. 



