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EXPERIMENTAL WORK WITH RAW ROCK PHOSPHATE, 91 
(south end) was limed and fertilized without manure, and sown to oats and 
clover. Thenceforth the manure, lime, and fertilizers have all been applied to 
the corn crops, the manure being plowed under and the lime and fertilizers 
applied to the surface. The oats and clover receive no treatment. The clover 
seeding failed in 1906, 1908, and 1909, and soy beans were grown instead and 
harvested as hay. 
The plan of treatment, average yields per acre, for nine years, and 
the increase per acre from the various treatments figured according 
to the Ohio method and also by comparing each treatment with the 
average of all the untreated plots are given in Table LV. 
The results obtained in 1914 and 1915 have been reported by 
Thorne in Bulletin No. 305 of the Ohio station, but no yields are 
given except those of the plots receiving acid phosphate and raw 
rock. These last two years’ results therefore are not included in the 
averages given in Table LY. 
7 EASise CST a. Ww Les ES . CE, Se 46 ee ee eee 
