1907.] PUBLIC DOCUMENT — No. 33. 23 



REPOKT OF THE AGRICULTURIST. 



WM. P. BROOKS; ASSISTANTS, E. S. FULTON, E. F. GASIQLL. 



The work carried on in the agricultural division of the 

 ex23eriment station during the past season has involved the 

 care of 308 field plots in the various fertilizer and variety 

 tests; 150 closed plots, largely used in fertilizer experiments; 

 and 286 pots in vegetation experiments, mainly designed to 

 throw light upon problems connected with the use of fer- 

 tilizers. It will be remembered that a large number of the 

 experiments in this division are continued from year to year. 

 Such repetitions are desirable, for reasons which are fully 

 set forth in the last annual report. A detailed account of 

 results obtained will at this time be presented only for a 

 relatively small number of the experiments in progress. The 

 experiments discussed, and the more important results, briefly 

 stated, are as follows : — 



I. — Experiment to determine the relative value as sources 

 of nitrogen of barnyard manure, nitrate of soda, sulfate of 

 ammonia and dried blood. This experiment has been in 

 progress since 1890. The crop of this year was corn, and 

 on the basis of yield the nitrogen materials under comparison 

 rank in the following order: barnyard manure, nitrate of 

 soda, sulfate of ammonia, dried blood. On the basis of in- 

 crease in crop, as compared with the product of the no-nitro- 

 gen plots, taking into account all the crops grown since the 

 experiment began (1890), the materials on a percentage 

 basis rank as follows : nitrate of soda, 100 ; barnyard manure, 

 85.31 ; dried blood, Y0.06 ; sulfate of ammonia, 63.54. 



II. — Experiment to determine the relative value of muri- 

 ate and high-grade sulfate of potash. The crops on the basis 

 of which comparisons are possible this year were soy beans, 



