ARTIFICIAL MANURES 9 



Pot Experiment with Artificial Manure 



A series of tests was run in order to compare the different artificial manures. 

 Oats were seeded in three-gallon crocks, filled with a mixture of one part of sandy 

 loam topsoil and three parts of fine sand. These sand cultures were treated with 

 dried artificial manure and inorganic fertilizers as indicated in table 4. A few 

 days after the oats had germinated and when they were about three inches tall, 

 the plants grown on the heavier treatments of artificial manure made with Cyana- 

 mid began to show signs of toxicity which continued throughout the experiment, 

 both height and yield of oats being less on this treatment. Analysis showed a 

 greater percentage of nitrogen in the oats grown on manure made with Cyana- 

 mid than in those grown on manures made with ammonium sulfate, but this may 

 have been due to the abnormality of the injured oat plants. This apparent 

 toxicity should not be considered a serious objection to the use of Cyanamid, for 

 the oats were grown in sand cultures and when trials were made under field con- 

 ditions no such injurious effects were noticed. At the Geneva Station, Collison 

 and Conn* experienced similar results when they worked with sand cultures. 



Table 4. — Pot Experiment with Artificial Manure. 



Rate of Application Yields per Pot Nitrogen Content 

 per Acre of Oat Plants 



Manure Made from — Manure Superphos- Height Dry Weight 



Tons phatc of Oat of Oat Percent Grams 



Pounds Plants Plants 

 Inches Grams 



10* 500 9.0 3 93 .74 .0291 



Corn stover with ammonium sulfate. . . "I 20 7.S0 9.0 4.22 .79 .0,?33 



30 1,000 9.0 4.55 .84 .0382 



10* 500 11.6 5.85 l.n .0649 



Corn stover with Cyanamid -120 7.10 10.8 4.75 1.32 .0^27 



30 1.000 9.7 4.55 1.^5 .0751 



10* 500 110 6.91 .75 .0518 



Straw with ammonium sulfate ■! 20 750 1 1.5 7.85 .77 .0605 



30 1,000 14.0 8.66 .77 .0667 



10* 500 12.5 T.07 .89 .0629 



Straw with Cyanamid {20 750 10.5 5.87 1.13 .0663 



30 1.000 10.0 6.05 1.14 .0690 



Check— no manure None None 11.5 7.30 .84 .0613 



*On bas;s of manure containing 0.5 percent nitrogen (N), that is, 100 pounds of N per acre, or 

 0.442 grams N per pot. The amount of dried artificial manure added to each pot was determined 

 by the actual N content of the respective artilicial manures. 



Field Experiments with Artificial Manure 



Field corn was planted on one hundredth acre plots, to which the different 

 artificial manures had been applied at the rates of 10, 20, and 30 tons per acre. 

 Yields were compared with yields from plots to which natural manure was applied 

 at equal rates. The growing corn on plots treated with 20 and 30 tons of manure 

 per acre was superior in growth and color to that on plots treated with 10 tons of 

 manure per acre. There was no great difference in yield of corn between plots 



^Collison, R. C, and Conn, H. J. Artificial manure from straw. N. Y. State Agr. Expt. Sta. 

 Bui. 573. 1929. 



