14 



N. H. Agr. Experiment Station 



[Bulletin 306 



and fall treatments are significantly higher for the spring application. 



It is difficult from the facts at hand to harmonize the results secured 

 with fall and spring applications of complete fertilizers with those for 

 nitrogen (Table VIII). Slightly greater growth was made by the grass 

 with complete fertilizer in the weeks after its application in the fall than 

 with nitrogen, but this difference would not be sufficient to account for 

 the use of a great deal of the fall fertilizer. It is more likely that the 

 explanation lies in the soil itself and in its power to fix phosphoric acid 

 and potash in insoluble compounds and perhaps in vaiying bacterial 

 relationships caused by the fertilizers. Neither of these problems were 

 studied in this experiment. 



Fall Applications Further Compared 



The series of plots treated in September with nitrogen and complete 

 fertilizers were harvested along with certain check plots for compari- 

 son. These harvests were taken about one month after the fertilizers 

 were applied. 



Table XI. Comparison of harvests after the use of nitrogen and a complete 

 fertilizer in fall applications on the O'Kane farm plots. 



Both treatments exhibit an increase in dry matter when compared 

 with untreated plots, and the difference is greater when considering the 

 protein content of the hay. This is due to the higlior protein percentage 

 of the hay from treated areas, the percentages being 15.7% and 15.6% 

 respectively for the nitrogen and complete fertilizer plots and but 12.3% 

 for the check series. 



Nitrogen in Different Amounts 



A series of plots which received nitrate of soda in different amounts 

 were included among the Mathes farm plots. Actual (juantities used 

 were 100, 200, and 400 pounds per acre, containing 16, 32, and 64 

 pounds of nitrogen respectively. 



Table XII. Results of applications of nitrate of soda in different amounts on 



Mathes farm plots. 



