28 N. H. AGR. EXPERIMENT STATION. [Bulletin 190 



The results of this treatment are unsatisfactory so far as a re- 

 sponse from fertilizer is concerned, since there has not been any- 

 noticeable increase in yield in succeeding years and the trees are 

 not able to surpass in >deld the unfertilized trees in Plots 4 and 5. 

 The average yield for the period is 210 pounds per tree or 153.71 

 bushels per acre. The growth in this like the other fertilized 

 plots has increased during the past few years and averages 9.14 

 inches per tree which would indicate that the trees were making 

 some use of the additional fertility provided in the fertiUzer. 



Plot 8.. 



This plot receives phosphorus in excess of the other plots and 

 receives the following fertilizer per acre: 



70 pounds nitrate of soda, 

 219 pounds acid phosphate, 

 52.5 pounds sulphate of potash. 



This treatment has not resulted in any increased yield over the 

 plots on either side of it. The application is not heavy but suffi- 

 ciently so to expect a response if the trees were badly in need of 

 this element. The growth is good, averaging 9.18 inches per 

 tree for the ten-year period and has increased from year to year, 

 subject of course to seasonal fluctuations. 



Plot 9. 



Here we have the following fertilizer applied per acre : 



140 pounds nitrate of soda, 

 109 pounds acid phosphate, 

 52.5 pounds sulphate of potash. 



This plot ranks sixth in yield in the ten-year average and 

 only one year in the period did- it rank highest in yield per tree 

 and that was in an off year (1917) . The actual yield is 219 pounds 

 per tree on the average or 160.27 bushels per acre which is 62 

 per cent better than the sod plot and no higher in yield than the 

 unfertilized Plots 4 and 5. In growth the response is seen since 

 this plot averages the highest in growth of any plot in the series. 

 The ten-year average is 9.43 inches per tree in terminal growth 

 and the trees are now considerably larger than those in Plots 4 

 and 5. The color of the fohage is darker than in any other plot, 



