14 MASS. EXPERIMENT STATION BULLETIN 290 



Table 5 — Yield of Hay 



(Pounds per plot.) 



*Lime applied. 



Tlie two successive crops of 1920 and 1921 represent a new arrangement of 

 fertilizers and lime, described fully in connection with the corn crops. It is suffi- 

 cient here to state that in 1919 the application of lime w^as made at the rate of 

 2000 pounds ground limestone per acre on the north half of each plot, except 6 

 which was left unlimed, and 8 which was limed throughout. Also the organic 

 nitrogen fertilizers were changed at that time to cyanamid on Plot 3 and dry 

 ground fish on Plot 10, because dried blood was no longer a common fertilizer 

 but was in great demand as food for animals. 



The crop of 1920 was seeded in the corn the summer before, and the crop 

 of 1921 was the second from the same seeding. The crop consisted of mixed 

 timothy, red top, and clover. Clover was the least of the three in proportion. 

 Red top prevailed on the unlimed areas. The fertilizers had been applied as a 

 spring top-dressing in each year. 



There are two striking results in these two crops. The limed ammonia plots 

 5 and 8 are much superior to the other nitrogen plots in 1920 and equal to the 

 best in 1921. Plots without nitrogen in 1921 excel all those with nitrogen and are 

 much heavier than in 1920. 



Corn 



The corn crops were produced under varying soil conditions. That of 1906 

 followed oats and peas of the year before, but an attempt was made to seed the 

 field with clover, after plowing under the stubble of the oats and peas. The clover 

 was so much winterkilled that it, too, was plowed under in the spring of 1906, 

 and corn was planted. The largest proportion of clover was on Plot and the 

 least on Plots 5 and 6. The manure plot is best this year, which may be due in 

 part to the clover that was on this plot when plowed. 



In 1911, the corn was grown upon a clover and timothy sod from the previous 

 hay crop. In this year, the maximum yield was on the plots without nitrogen, 

 and the ammonia plots were second. The crops of 1912, 1918, and 1919 followed 

 tilled crops of the previous year. Plots without nitrogen were noticeably inferior. 

 Nitrate plots and organic plots shared first and second places between them, 

 alternating in standing with the years. 



