1891.] PUBLIC DOCUMENT — No. 33. 189 



C 304 pounds of ground apatite. 

 Plat III., 6,636 square feet, . «j 44 pounds of nitrate of soda. 



(^ 59 pounds of potash-magnesia sulphate. 



S131 jiounds of South Carolina phosj>hate. 

 441 pounds of nitrate of soda. 

 60 pounds of potash-magnesia sulj^hate. 



C 78 pounds of dissolved bone-black. 

 Plat V., 6,778 square feet, . < 45 pounds of nitrate of soda. 



(_ 61 pounds of potash-magnesia sulphate. 



The phosphatic slag, Mona guano and South Carolina 

 floats were applied at the rate of 850 pounds per acre, apa- 

 tite at the rate of 2,000 pounds per acre ; dissolved bone- 

 black at the rate of 500 pounds per acre. These figures 

 represent approximately the equal local cash values of the 

 different sources of phosphoric acid applied. Nitrate of 

 soda corresponds in all cases to an application of 290 pounds 

 per acre, and the potash-magnesia sulphate at the rate of 

 390 pounds per acre. 



The field was planted with potatoes, Beauty of Hebron ; 

 the large-sized ones were cut in halves, and the small ones 

 left whole, when planted, May 1, 1890. The rows were 

 three feet three inches apart, and the hills in the rows 

 eighteen inches. Each pint had sixteen rows. The young 

 plants came up quite uniformly ; they were cultivated and 

 hoed June 2. Several applications of Paris green with 

 plaster were made during the season, to prevent damage by 

 potato bugs. The crop looked well until the middle of 

 July, when the effects of a serious drought showed itself to 

 such an extent that the maturing seemed to be hastened on 

 by it. 



The potatoes were harvested from all the plats August 12 

 to 14. They were assorted in the field into marketable ones 

 and small ones. The former were sold at sixty cents per. 

 bushel ; the latter were used for chicken feed, at twenty 

 Cents per bushel, — our local market prices. 



