10 



MASS. EXPERIMENT STATION BULLETIN 395 



treated with artificial manure and those treated with natural horse manure, 

 except on the plots receiving the 30-ton application, where the artificial manures 

 gave higher yields than the natural manure. (Table 5). It may be concluded 

 that the artificial manure as prepared here is comparable to and slightly better 

 than ordinary natural horse manure when used at high rates of application. 



Table 5. — Yields of Corn Grown on Artificial Manure. 



Manure Made trom 



Kate of 



Application 



per Acre 



Tons 



Yields per Acre — Pounds 



Field Green Field Dry Field Dry 



Weight of Weight of Weight of 



Corn Whole Ear Stover 



10* 16.023 3.620 4,135 



Corn stover with ammonium sulfate. .. . "120 19,023 4,858 5,199 



30 20,966 5,495 5,028 



10* 15,614 3,225 4,261 



Corn stover with Cyanamid -120 20,625 4,688 5,352 



30 22,432 5,625 6,007 



10* 17,386 3,876 4,763 



Straw with ammonium suliate -j 20 21,239 5,154 5,206 



30 24,307 6,989 6,221 



10* 18,750 4,176 4,988 



Straw with Cyanamid -j 20 21,921 5,414 5,666 



30 22,261 6,136 6,096 



10* 16,466 3.705 4,575 



Natural Manure -120 17,898 4,176 5.574 



30 18,170 4,261 5,318 



4-8-4 Fertilizer 1,250 pounds 17,727 4,558 4,677 



*On basis of manure containing 0.5 percent nitrogen (N), that is, 100 pounds of N per acre. 

 The amount of dried artificial manure added to each plot was determined by the actual N content 

 of the respective artificial manures. 



Experiments with Artificial Manure as Top- Dressing 



A one-year-old field of mixed grass was top-dressed with the prepared artificial 

 manures after the first crop of hay had been harvested The second crop of grass 

 was not harvested, but from observation looked much superior to that on the 

 surrounding untreated plots. The following year the hay contained a greater 

 percentage of clover than the crop from the untreated plots. The yields per 

 acre, on the dry basis, are listed in table 6. 



Table 6. — Yield of Hay Grown on Plots with Artificial Manure 



• Top Dressing 



Manure made froni- Yield on Dry Basis 



Corn stover with Pounds per Acre 



Ammonium sulfate 5281 



Cyanamid 5227 



Oat straw with 



Ammonium sulfate 4541 



Cyanamid. ..." 5101 



Leaves and garbage with 



Cyanamid 6265 



Untreated plot 3363 



