26 a EXPERIMENT STATION. [Jan. 



When nitrate is used in connection with manure (as in the 

 other combinations referred to) summer application or divided 

 spring and summer application gives rei^ults rather better than 

 spring application. 



Complete Chemical Fertilizers in Connection with Manure. 

 — A mixture of chemicals, making what may be called a com- 

 plete fertilizer (nitrate of soda, acid phosphate and muriate 

 of potash), used in connection with manure at the rate of 

 20,000 pounds per acre, produced a moderate increase in crop, 

 but the increase produced has not been as great as that pro- 

 duced by the use of nitrate alone in connection with the same 

 amount of manure. The fact that the increase on the complete 

 fertilizer is less than that produced by nitrate alone is probably 

 not significant ; but since it is no greater, the conclusion is 

 apparently justified that the use of the acid phosphate and 

 muriate of potash in connection with manure has not been 

 beneficial. 



Effect of Acid Phosphate. — The addition of acid phosphate 

 to a combination of nitrate of soda and muriate of potash, 

 furnishing adequate quantities of nitrogen and potash, has 

 but little effect upon the crop. 



Effect of Potash. — The use of muriate of potash in connec- 

 tion with a mixture composed of nitrate of soda and acid phos- 

 phate in adequate amounts greatly increases the crop, but a 

 quantity in excess of 300 pounds to the acre has not been 

 beneficial. 



Comparison of Different Materials as a Source of Potash. — 

 Muriate of potash is used in these experiments as the source of 

 potash on almost all plots, but for the purpose of comparison 

 one plot for each is introduced where the source of potash is 

 different. The materials under comparison are wood ashes, 

 kainit, high-grade sulfate of potash and low-grade sulfate of 

 potash (potash-magnesia sulfate). The yield on all of these 

 materials is considerably less than on the muriate of potash, 

 but the kainit is considerably superior to the ashes or either 

 of the sulfates. It is important, however, to call attention to 

 the fact that it seems likely that the yield on the plots receiving 



