8 



N. H. AGR. EXPERIMENT STATION. 



[Bulletin 11 



than Plot 5, indicating that both plots have been receiving suffi- 

 cient supplies of available food materials for fruit production. 



MOISTURE AND NITRATE DETERMINATIONS. 



Soil samples were taken weekly during most of the growing 

 season for four years. The surface soil is taken from 7 to 9 inches 

 (or a little more) depending on its depth and the subsoil is taken 

 from that point to 3 feet. Three samples are taken from each 

 plot and after thoroughly mixing, a pint sample is taken for 

 analysis. Moisture is determined by oven drying a 50 gram sam- 

 ple at close to 100° C. Nitrates are determined according to the 

 method described in Bulletin No. 31, U. S. Dept. of Agriculture, 

 Bureau of Soils. The following tables show the average per- 

 centage of moisture and nitrates (parts per million of dry soil) 

 found each week during the growing season for four years under 

 the various treatments heretofore mentioned. 



Table No. 4. 



Summary of Moisture Determinations. 



Average per Plot. Percentage. 



Surface soil. 



Subsoil. 



