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



13 



Table VI. — Total yield cured hay per acre five year's, 



1927-31 



Unplowed plots 



Total Yield 



Ch 

 T. D. 



5510 ± 199 

 7030 ±: 316 



Gain 



1520 ± 373 



From the yields reported in this table it can be seen that the old hay 

 land with which we started was not high yiekling, nor was the type oT 

 grass* in the stand particularly responsive to applications of nitrogen. 



The average annual yield on the untreated or check plots was 1,102 

 pounds of hay per acre, while those top-dressed annually with nitrate 

 of soda averaged 1,406 pounds, an average gain of 304 pounds per acre 

 for each 100 pounds of nitrate of soda applied. 



The yields for the plots which were plowed, given various treatments 

 and reseeded, are presented in the following summary: 



Table VII — Land plowed and seeded — Total yield cured hay per 



acre, five years, 1927-31 



Ten tons manure (M) applied in 1925 showed a total gain of 3,426 

 pounds of hay over the period studied, or a gain of 342 pounds for each 

 ton of manure applied. 



The addition of annual increments of superphosphate to the plots 

 which had received manure (MP) does not seem to have been of bene- 

 fit to timothy. These plots actually showed a slight decrease from 

 those which had manure alone. The difference is not significant, how- 

 ever. 



Nitrate of soda applied annually to certain manured plots (MN) did 

 increase the yield markedly. Compared with the plots which had no 

 treatment, these plots yielded 7,460 pounds more hay during the five- 

 year period, or 1,492 pounds more per annum. Compared with those 

 which had manure alone, the plots getting nitrate of soda in addition 

 yielded 4,034 pounds more hay in five years, which is an increase of 

 807 pounds of hay for every 100 pounds of nitrate of soda applied. 



There is practically no difference in yield between the plots which 



*The stand of grass in the old sod was composed mainly of "poverty 

 gi'ass," "Danthonia Spicata." 



