March, 1928] 



AGRICULTURAL EXPERIMENTS 1927 



19 



phosphorus where used alone. Other fertihzers used with manure, with 

 the exception of potash, were additive. 



Dairy Farm Rotation 



This experiment, embracing 120 plots, was started in 1926, when the 

 land was fall plowed and lime applied to certain plots at the rate of one, 

 two and three tons per acre. 



In the spring of 1927, the field was manured uniformly at the rate of 12 

 tons per acre, and a basic treatment of 300 pounds of acid phosphate was 

 applied. Certain plots were then fertilized with 300 pounds acid phos- 

 phate, 150 pounds muriate of potash and the two together. The whole 

 field was planted to silage corn. 



Of the increases recorded all those are significant on plots which had 



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Some of the sweet clover plots iu soil fertility studies at (Jreenland. 



two or three tons of ground limestone, either alone or in combination with 

 phosphorus and potash. The only other significant increases are those 

 on plots where one ton of lime was applied with potash alone or in a 

 mixture. 



It would appear, therefore, that lime and potash have had considerable 

 effect on the growth of silage corn. (Purnell Fund.) 



Pasture Improvement 



Two areas on the I^niversity farm, one on a good, the other on a poor, 

 pasture were laid out by F. S. Prince and divided into four twentieth-acre 

 plots in the spring of 1926. One of the plots on each area was plowed; all 

 were limed and treated with 500 pounds acid phosphate per acre. No 

 manure was used. 



The plowed plots were seeded in May, 1926. A perfect stand of sweet 

 clover was secured on the plot in the good pasture, and about a half 

 stand in the poor pasture. 



One plot in each area was disked and seeded. About one fourth of a 

 stand was secured in the good pasture area, but in the poor pasture disking 

 was slightly more successful, due to a better seed bed being prepared. 



