BULLETIN 224. 



FIELD EXPERIMENTS. 



Reported by Chas. D. Woods. 



The experimental work at Highmcor Farm is planned by 

 the Director, the Biologists, the Plant Pathologist, and the En- 

 tomologist. In the following pages there are given the results 

 of certain experiments that lie somewhat outside of the lines of 

 work of any of the Station specialists. The carrying out of 

 these experiments and the taking of the requisite notes de- 

 volved upon different members of the staff. In general the 

 field work was executed under the direction of Mr. Wellington 

 Sinclair, the Superintendent of Highmoor Farm. The notes 

 were chiefly taken in 1910 and 191 1 by Mr. Walter W. Bonns ; 

 in 1912 by Mr. George A. Yeaton, and in 1913 by Mr. Harold 

 G. Gulliver. 



Top Dressing Experiment on Grass in 1910, 1911 and 1912. 



A fertilizer manufact-urer who is an enthusiastic advocate 

 of Thomas phosphate powder as an economical source of 

 phosphoric acid that carries with it the lime needed to correct 

 acidity of soil, asked that the Station undertake an experiment 

 in top dressing grass land in which Thomas prosphate powder 

 would be compared with acid phosphate as a source of phos- 

 phoric acid. The field best adapted to such an experiment on 

 Highmoor Farm consisted of about five acres, half of which 

 was seeded in 1909 and the other half in 1908. This was di- 

 vided into three plots of one and three-fourths acres each in 

 such a way that each plot contained an equal amount of each 

 year's seeding. The grasses were a mixture of timothy and 

 redtop with some clover and June grass. The stand was fair 

 and about the same over the whole -field. The plots ran north 



