EXPERIMENT STATION REPORTS. 



331 



excess of the acid phosphate and muriate of potash and the nitrate of 

 soda and acid phosphate has proved but little better than the acid phos- 

 phate alone. On lands liberally treated with barnyard manure these 

 differences would probably be smaller or would disappear altogether. 

 The floats or raw phosphate rock, though costing only a little over one- 

 half as much as the acid phosphate and carrying approximately twice 

 as much phosphoric acid has given only about half as good net returns. 



It should be noted that all the fertilizers have been used with good 

 profits. The conclusion would seem to be warranted that on farms of 

 similar soil types the use of proper fertilizers should prove profitable, 

 provided, of course, there are no other factors such as lack of drainage, 

 proper culture, etc., that seriously limit production, and that the use 

 of a complete fertilizer should pay best in case a limited amount of ma- 

 nure is available, while on well stocked farm the phosphorus and potash 

 would probably be used most profitably. 



MANURE EXPERIMENTS. 



In the manure experiments the manure has been taken from the cow 

 stable and placed in a pile which has been forked over several times so 

 as to mix it thoroughly and make it as uniform as possible. Later it 

 has been divided and certain lots treated as per plan, the treatment usu- 

 ally being made four to six weeks previous to applying to the field. The 

 yard manure has been placed in a large open box outside while all the 

 other lots have been preserved under cover. The manure has been ap- 

 plied to the corn crop in a corn, wheat, clover rotation two to four weeks 

 previous to plowing. 



The yields of corn and clover from the several treatments are given 

 in Tables 3 and 4. 



TABLE III.— YIELDS PER ACRE OF MANURED CORN IN A CORN, WHEAT AND CLOVER 



ROTATION, 1911-1916. 



Treatment per acre. 



Average 

 for 6 

 years. 



No manure or fertilizer 

 5 tons yard manure . . . 

 5 tons stall manure .... 

 5 tons stall manure. . . . 

 200 lbs. acid piiosphate 

 5 tons stall manure. . . . 



200 lbs. floats 



10 tons stall manure. . . 



33.2 

 42.4 

 42.7 



48.7 



46.2 

 49.2 



TABLE IV.— YIELDS PER ACRE OF CLOVER, SECOND YEAR AFTER MANURED. 

 IN CORN, WHEAT, CLOVER ROTATION, 1915-1916. 



CORN 



