N. H. AGR. EXPERIMENT STATION. 



[Bulletin 11 



Plot 11. The limed plot extends across one end of four fertilized 

 plots and each tree has received an application of 20 pounds 

 of lime* per tree for nine years.f The fertilizers on the 

 four plots respectively are 2 pounds nitrate of soda, 4 pounds 

 sulphate of potash, 8| pounds acid phosphate, per tree; 2 

 pounds nitrate of soda, 4 pounds sulphate of potash, 17pounds 

 acid phosphate, per tree; 6 pounds nitrate of soda, 4 pounds 

 sulphate of potash, 8| pounds acid phosphate, per tree; and 

 2 pounds nitrate of soda, 10 pounds sulphate of potash, 8^ 

 pounds acid phosphate, per tree. 



Plot 12. For a check on the lime treatment a similar plot of trees 

 was selected which stands parallel to the limed plot. 



YIELD AND GROWTH OF TREES. 



These plots have behaved differently as regards yield and 

 growth since they have been under the influence of the various 

 treatments. Therefore it should be possible to trace some of the 

 reasons for the marked and consistent variation in behavior to 

 the effect of the treatments on the soil activities. 



The following measurements were made at the end of the grow- 

 ing season by taking the length of new growth of twenty twigs which 

 so far as can be determined are typical of the growth of the tree. 

 Each tree in a plot is thus measured and the average growth for the 

 plot then calculated. 



Table No. 2. 



Average Annual Twig Growth Per Tree. 

 Inches. 



*65% CaCO.,. 



tSee Bulletin 168, N. H. Experiment Station. 



