1906.] PUBLIC DOCUMENT — No. 33. 19 



I. — Manures and Fertilizers furnishing Nitrogen 

 coiviPARED. (Field A.) 



To make clear the plan of the experiment, which is con- 

 tinuous, I quote from the seventeenth annual report : — 



The experiments in Field A have two principal objects in 

 view: first, to compare the efficiency (as measured by crop 

 production) of a few standard materials which may be used on 

 the farm as sources of nitrogen; second, to determine to what 

 extent the introduction of a legume will render the application 

 of nitrogen to a succeeding crop of another family unneces- 

 sary. The field includes eleven plots of one-tenth acre each. 

 A full descrij)tion of the plan followed will be found in the 

 twelfth annual report of the Hatch Experiment Station. The 

 materials furnishing nitrogen under comparison are barnyard 

 manure, nitrate of soda, sulfate of ammonia and dried blood. 

 With few and unimportant exceptions, each plot has been 

 manured in the same way since 1890. All the plots annually 

 receive equal and liberal amounts of materials supplying phos- 

 phoric acid and potash. Three plots in the field have had no 

 nitrogen applied to them since 1884; the materials under com- 

 parison on the other plots in the field are applied in such 

 quantities as to furnish nitrogen at the rate of 45 pounds per 

 acre to each. Barnyard manure is applied to one plot, nitrate 

 of soda to two, sulfate of ammonia to three and dried blood to 

 two plots. The potash applied to these plots is supplied in the 

 form of muriate to six plots, namely, 1, 3, 6, 7, 8 and 9. It is 

 supplied in the form of low-grade sulfate to four plots, namely, 

 2, 4, 5 and 10. 



The crops grown in this experiment previous to this year 

 in the order of their succession have been : oats, rye, soy 

 beans, oats, soy beans, oats, soy beans, oats, oats, clover, 

 potatoes, soy beans, potatoes, soy beans, potatoes. 



The condition of the soil of this field during the last year 

 or two had indicated quite clearly that it would be benefited 

 by liming. Freshly water-slaked lime was used. It was 

 applied by the use of Kemp's manure spreader, adjusted 

 with a view to appljdng lime as closely as possible at the 

 rate of 1 ton to the acre. The amount actually applied to 



