April 1933] fertilizer experiments on "run-out" hay land 



11 



It should be noted that the maximum pH obtained with four tons 

 of ground limestone per acre is only about 6.1, which is still far from 

 neutrality. 



pH VALUES OF SOILS 



S 



28 ^9 



YEAR 



Fig. T. Shoiving average pH value of tivo groups of plots, 1925-31, one 

 of ivhich received two tons of ground limestone per acre and the other 



four tons 



Excellent crops of alfalfa have been obtained from soils having a pH 

 value as low as 5.6 resulting from the application of two tons of ground 

 limestone per acre. 



The use of an additional two tons of limestone increased the pH of 

 the soils markedly but did not result in a significant increase in yield. 



II TOP-DRESSING HAY 



A portion of the same field on the Whenal farm where the alfalfa 

 experiment was conducted was plowed in August 1925 and prepared 

 for a fall seeding of timothy. Prior to seeding certain plots were ma- 

 nured and lime applied as a cross treatment at the rate of two and four 

 tons per acre, with an equal number of plots unlimed. 



Twelve plots, representing the old sod, were left unplowed, one at 

 either end of each of the six tiers of plots. Beginning in 1926 six of 



